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SACA C-207 Programmable Controller Systems 1 Exam Prep 2026: Complete Study Guide, Exams of Computer Science

Chamberlain College of Nursing Computer Science

SACA C-207 Programmable Controller Systems 1 Exam Prep 2026: Complete Study Guide with Practice Questions, PLC Programming, and Certification Review

Typology: Exams

2025/2026

Available from 03/12/2026

prof-daniel 🇺🇸

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SACA C-207 Programmable Controller Systems 1 Exam Prep

2026: Complete Study Guide with Practice Questions, PLC

Programming, and Certification Review

1. What are the software programs that connect the hardware of a PLC to a

network and allow them to communicate with other devices?

• Correct Answer: Drivers

• Rationale: Drivers act as translators between the PLC's hardware (like the processor

and I/O modules) and the network protocol, enabling them to send and receive data.

2. What three key components are contained within a PLC project file?

• Correct Answer: Ladder logic programs, hardware configuration, tags and

communication configuration

• Rationale: A PLC project file is a complete package. It contains the user-created logic

(ladder logic), the definition of the physical hardware setup (hardware configuration),

and the variables (tags) and network settings needed for the program to run and

communicate.

3. What does a PLC use to store the status of input and output modules by

assigning each terminal a specific place in memory?

• Correct Answer: Tag

• Rationale: A tag is a named area in the PLC's memory. It's assigned to a specific

terminal or piece of data, allowing the programmer to reference the status of that

input or output throughout the program.

4. Which part of a PLC is responsible for executing the logic program?

• Correct Answer: Processor

• Rationale: The processor (or CPU) is the "brain" of the PLC. It reads the input data,

executes the stored program based on that data, and then updates the outputs

accordingly.

Discover Exams of Computer Science Chamberlain College of Nursing

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Download SACA C-207 Programmable Controller Systems 1 Exam Prep 2026: Complete Study Guide and more Exams Computer Science in PDF only on Docsity!

SACA C-207 Programmable Controller Systems 1 Exam Prep

2026 : Complete Study Guide with Practice Questions, PLC

Programming, and Certification Review

1. What are the software programs that connect the hardware of a PLC to a network and allow them to communicate with other devices?

Correct Answer: Drivers
Rationale: Drivers act as translators between the PLC's hardware (like the processor and I/O modules) and the network protocol, enabling them to send and receive data. 2. What three key components are contained within a PLC project file?
Correct Answer: Ladder logic programs, hardware configuration, tags and communication configuration
Rationale: A PLC project file is a complete package. It contains the user-created logic (ladder logic), the definition of the physical hardware setup (hardware configuration), and the variables (tags) and network settings needed for the program to run and communicate. 3. What does a PLC use to store the status of input and output modules by assigning each terminal a specific place in memory?
Correct Answer: Tag
Rationale: A tag is a named area in the PLC's memory. It's assigned to a specific terminal or piece of data, allowing the programmer to reference the status of that input or output throughout the program. 4. Which part of a PLC is responsible for executing the logic program?
Correct Answer: Processor
Rationale: The processor (or CPU) is the "brain" of the PLC. It reads the input data, executes the stored program based on that data, and then updates the outputs accordingly.

5. Should the power supply located in the chassis or backplane be used to power external field devices?

Correct Answer: False
Rationale: The chassis/backplane power supply is specifically designed to power the PLC's own internal modules (processor, I/O cards, etc.). Powering external devices like sensors or actuators requires a separate, external power supply. 6. What is the sixth basic component of a PLC, alongside the power supply, input modules, output modules, chassis, and processor?
Correct Answer: Programming Device
Rationale: A PLC needs a way to receive its program. A programming device (like a laptop with software, or a dedicated handheld programmer) is used to create, transfer, and monitor the control logic. 7. Along with Ethernet, what is the second most popular communication protocol used with PLCs?
Correct Answer: Universal serial bus (USB)
Rationale: While Ethernet is dominant for industrial networks, USB is extremely common for direct, short-range connections between a programming device (like a laptop) and a PLC for programming and troubleshooting. 8. Typically, will a USB driver automatically start when a programming device detects the connection?
Correct Answer: False
Rationale: While the operating system might detect new hardware, the specific driver for the PLC communication often requires manual installation or configuration using the PLC manufacturer's software. 9. What is the proper sequence of operation within a PLC's scan cycle?
Correct Answer: Examine inputs, perform logic, update outputs
Rationale: This is the fundamental "scan cycle" of a PLC. It first reads the state of all physical inputs, then executes the ladder logic program based on those input states, and finally writes the resulting states to all physical outputs. 10. Which statement accurately describes PLC Program Mode?
Correct Answer: Allows the user to download, upload, edit and save project files. The processor does not scan or execute the ladder program, and outputs are not energized.

15. Which statement describes PLC Run mode?

Correct Answer: Allows the user to upload, save, edit, and monitor the operation of the PLC project. The processor executes the ladder program, monitors status of inputs, and energizes appropriate outputs.
Rationale: Run mode is the operational state of the PLC. The processor is actively scanning inputs, executing the logic, and updating outputs to control the process. While in this mode, a technician can typically monitor live data. 16. In the module tag Local:1:I.Data, what does the "I" refer to?
Correct Answer: Input
Rationale: In standardized PLC addressing (like Rockwell Automation's), the colon is used as a delimiter. "Local:1" specifies the location and slot number, and "I" stands for the module's data type, which in this case is I nput. This is where the status of input points is stored. 17. When voltage is applied to the terminal of an active high PLC input module, what is the state of an XIO instruction with the same address?
Correct Answer: False
Rationale: An XIO (eXamine If Open) instruction looks for an "off" or false condition. When voltage is applied to the input, the corresponding tag in memory is True. Since the XIO is looking for False, it evaluates to False, and logic will not flow through it. 18. When voltage is applied to the terminal of a PLC input module, what is the state of an XIC instruction with the same address?
Correct Answer: True
Rationale: An XIC (eXamine If Closed) instruction looks for an "on" or true condition. When voltage is applied, the tag's value is True. The XIC evaluates to True, and logic can flow past it. 19. After creating a new project, naming it, and configuring the controller and I/O, what is the next logical step to enter the control logic?
Correct Answer: Open the program editor and add rungs
Rationale: The hardware configuration defines the physical setup. The next step is to create the software logic that tells the hardware what to do. This is done by opening the programming editor (e.g., the ladder logic editor) and building the program, typically one rung at a time. 20. PLC input/output diagrams are used to show the specific physical connections between the _______ and the PLC I/O terminals.

Correct Answer: Real world devices
Rationale: I/O diagrams, or wiring diagrams, are essential documentation. They illustrate how field devices like pushbuttons, limit switches, motor starters, and sensors are physically wired to the terminals on the PLC's input and output modules. 21. If you want a Jog switch to be active ONLY in Manual mode, what tag address needs to be applied to the XIC instruction in that rung?
Correct Answer: Local:1:I.Data.7 (or whichever address corresponds to the Manual Mode selector switch)
Rationale: To make an output conditional based on the system's mode, you would place the "Manual Mode" condition in series with the "Jog" command. In ladder logic, this means an XIC instruction for the Manual Mode selector switch is placed on the same rung as the XIC for the Jog switch. The jog output will only be true if the manual mode condition and the jog button condition are both true. 22. If a technician is using an HMI panel to monitor or test a process, what are they interacting with?
Correct Answer: Objects
Rationale: An HMI (Human-Machine Interface) presents a graphical representation of the process. Technicians interact with graphical "objects" such as buttons, indicators, numeric displays, and sliders, which are linked to tags in the PLC. 23. If you want to set up Ethernet communication between a PLC and a PC, what two addresses MUST be configured correctly?
Correct Answer: IP address and Subnet Mask
Rationale: For two devices to communicate on the same IP network, they must have unique IP addresses and compatible subnet masks. The MAC address is a hardware address burned into the network card and is not typically configured for basic communication setup. 24. To de-energize an output controlled by a "Greater Than or Equal To" (GEQ) instruction comparing N7:1 to a value, what must be true of N7:1?
Correct Answer: It must be less than the comparison value.
Rationale: A GEQ instruction is true when Source A (e.g., N7:1) is greater than or equal to Source B (a set value). For the rung to be false and thus de-energize the output, the condition must be false, meaning N7:1 must be less than the comparison value. 25. What value in Source A would cause remlight.7 to illuminate in a "Less Than" (LES) instruction with Source B set to 100?

30. A discrete input module uses 12VDC as its voltage level. A normally open limit switch is wired to a terminal. If the module is Active High, what value needs to be seen at the terminal to illuminate the status indicator for that terminal?

Correct Answer: 12VDC
Rationale: The status indicator (LED) on an input module is typically wired to illuminate when the module's internal circuitry detects an ON condition. For an Active High module, an ON condition is triggered by the presence of the rated voltage (12VDC) at the terminal. 31. In the provided counter example, after one count, CTU_EXAMPLE.ACC = 1. What is the state of the COUNT SWITCH?
Correct Answer: FALSE
Rationale: A CTU (Count Up) instruction increments on the rising edge of its input condition. This means it counts when the switch transitions from OFF to ON. After that single transition occurs and the instruction has counted, the switch input itself may return to FALSE (0) if it was a momentary pulse, or it could still be TRUE. However, in the context of the example showing "ACC = 1," it is common to see the switch condition used to trigger the count being false after the rising edge has passed. 32. Based on the provided program logic, what will be the status of LAMP L and LAMP L1?
Correct Answer: OFF, OFF
Rationale: Without seeing the specific diagram, this answer indicates that the conditions required to turn on either Lamp L1 or Lamp L2 are not currently being met. The logic rungs controlling these outputs are evaluating to "False." 33. A CTU instruction's DN bit is ___ whenever the accumulated (ACC) value is greater than or equal to the Preset (PRE) value and ___ when the value is less than the preset (PRE) value.
Correct Answer: true, false
Rationale: This reinforces the concept of the "Done" bit as a status indicator. It automatically reflects the comparison between the accumulated value and the preset value, turning on when the target is met or exceeded and turning off when the value falls below the target. 34. In the timer-driven program example, LAMP L2 will be on when?
Correct Answer: ACCUM > 0 AND < 8000 (and the first rung is true)

Rationale: This suggests LAMP L2 is controlled by a timer's "Timing" (or "TT") bit. The TT bit is true from the moment the timer starts accumulating (ACC > 0) until it reaches its preset value (ACC = PRE, which is 8000). For the TT bit to be active and thus energize the lamp, the timer's enabling rung must also be true. 35. In the timer-driven sequence, PB1 is pressed and held for 5 seconds, then released. What is the value displayed in the PRESET?
Correct Answer: 8000
Rationale: The Preset (PRE) value of a timer is a constant entered by the programmer and defines the target duration. It does not change based on how long a button is pressed. The Accumulated (ACC) value would have reached a value corresponding to 5 seconds, but the PRE remains fixed at 8000 (or whatever value it was set to). 36. This program is an example of a time-driven sequence. Step 1: PB1 is pressed, Pump P1 energizes, Pump P2 energizes. What component in the program triggers the LAST step?
Correct Answer: TIMERS[1].DN
Rationale: In a time-driven sequence using cascading timers, the completion of one timer often triggers the next event. The "Done" (DN) bit of the second timer (TIMERS[1].DN) becoming true would be the logical trigger to begin the final step, which might be turning off the last pump. 37. A PLC using a USB cable would have what type of connector?
Correct Answer: TYPE B
Rationale: On a PC, a standard "Type A" USB connector is used. On peripheral devices like printers, scanners, and many PLCs, the "Type B" connector (a square- shaped connector with beveled corners) is commonly found. 38. Each group of digits in an IP address is called an octet.
Correct Answer: True
Rationale: An IPv4 address is a 32-bit number, typically written in dotted-decimal notation (e.g., 192.168.1.10). Each of the four decimal numbers separated by dots represents 8 bits, or one "octet," of the full address. 39. HMI panels are configured using the HMI software in the configuration menu.
Correct Answer: True
Rationale: HMI panels require dedicated configuration software (often provided by the manufacturer) to design the graphical user interface, create tags, and link

45. A Compute (CPT) instruction can be used instead of any ADD, MUL, DIV or SUB instruction, but is not recommended.

Correct Answer: True
Rationale: The CPT instruction is a powerful, flexible tool that can perform complex mathematical expressions in a single block. However, dedicated instructions like ADD and SUB are often preferred because they are simpler, execute faster, and make the program logic easier for others to read and troubleshoot. 46. An MCR circuit is used as a safety device to remove power from all PLC outputs.
Correct Answer: False
Rationale: This is an important distinction. A software MCR (Master Control Relay) only affects the logic execution within the PLC program. It does not physically cut power to the output modules. True safety requires a hard-wired circuit (like an emergency stop) that physically interrupts power to the output devices or the master control relay. 47. What value in Source A would cause remlight.5 to turn off?
Correct Answer: Any value outside the specified range (or "Any of these" depending on the exact limit test configuration).
Rationale: If remlight.5 is controlled by a LIM (Limit Test) instruction that turns the light on when the value is within a range, then to turn the light off, the value must fall outside that range. This means it could be any number either less than the lower limit or greater than the upper limit. The provided answer key from the text states "Any of these," suggesting the question presented a list of values, all of which were outside the active range. 48. Which switch controls the Reverse limit?
Correct Answer: LS
Rationale: In typical industrial wiring and ladder logic diagrams, limit switches are labeled with standard conventions. "LS" stands for Limit Switch, and the number following it (e.g., LS1, LS2) identifies the specific switch. For a motor control circuit with forward and reverse movement, LS1 is commonly the forward limit switch, and LS2 is the reverse limit switch. 49. One of the advantages of a PLC is that it permits many instructions to be controlled by one ______.
Correct Answer: Tag or address

Rationale: Unlike hard-wired relay logic where a single physical contact can only be used in a limited number of places, a PLC's tag or memory address can be referenced by an unlimited number of instructions throughout the program. This is a massive advantage for flexibility and efficiency. 50. Tags with a DINT data type contain how many bits?
Correct Answer: 32
Rationale: DINT stands for "Double INTeger." While an INT (integer) is typically 16 bits, a DINT is 32 bits. This allows it to store much larger whole numbers (from - 2,147,483,648 to 2,147,483,647). 51. The most common method of controlling a motor with a PLC is to use what?
Correct Answer: A motor starter
Rationale: A PLC output module typically cannot handle the high current and voltage required to power a motor directly. A motor starter, which contains a contactor (for switching power) and overload relays (for protection), acts as an intermediary. The PLC's low-power output energizes the motor starter's coil, and the starter's high-power contacts then control the motor. 52. What function do the highlighted instructions perform in a program with motor interlocking?
Correct Answer: Program interlocking
Rationale: In motor control circuits, "interlocking" is a safety feature that prevents conflicting actions from happening simultaneously, such as the forward and reverse contactors being energized at the same time (which would cause a short circuit). This is achieved by placing an XIC instruction for the forward contactor's seal-in in series with the reverse coil, and vice versa. The highlighted instructions are likely these interlocking contacts. 53. What would happen if PB3 (the Down pushbutton) failed to close when pressed?
Correct Answer: The door would move up, but not down
Rationale: In a typical door control circuit, if the "Down" pushbutton fails in an open state (fails to close), pressing it will not complete the circuit to the down direction coil. The "Up" circuit, being independent and unaffected by the failure of PB3, would still function normally. 54. When the address Local:1:1.Data.0 contains a 0, which statement below is true about the physical input?
(The question text did not include the options, but the key takeaway is below)

wiring diagram would show that this specific terminal is connected to the forward contactor coil in the motor starter. When this bit is set to 1 (true), the output energizes, pulling in the forward contactor.

59. In the Power Diagram below, if the motor runs in the Forward direction, the screw moves to the right. If the motor runs in the reverse direction, the screw moves to the left. If a technician was using an HMI panel to monitor or test a process, they would be interacting with what?

Correct Answer: Objects
Rationale: This reinforces a previous concept. HMI panels present a graphical interface composed of "objects" such as pushbuttons, indicators, numeric displays, sliders, and text boxes. Technicians interact with these objects to monitor data or control the process, and each object is linked to a specific tag in the PLC. 60. If you want to set up Ethernet communication between a PLC and a PC, what two addresses MUST be configured correctly?
Correct Answer: IP address and Subnet Mask
Rationale: This question revisits a fundamental networking concept. While the study guide text originally listed "IP address and MAC address," the correction provided earlier clarifies that the MAC address is a hardware address burned into the network interface card (NIC) and is not typically configured by the user. The two essential user-configured settings for devices to communicate on the same IP network are:

IP Address: A unique identifier for each device on the network.
Subnet Mask: Determines which part of the IP address identifies the network and which part identifies the specific device. Both devices must have compatible subnet masks to recognize they are on the same local network. 61. The HMI project is stored in the HMI memory.

Correct Answer: True
Rationale: The configuration file created in the HMI software—containing all the graphical screens, tag definitions, animations, and communication settings—is downloaded and stored in the HMI panel's own non-volatile memory (such as flash memory). When the HMI powers on, it loads this project from its internal memory. 62. When using an HMI panel connected to an Ethernet network, it must have a unique IP address.
Correct Answer: True
Rationale: An HMI panel is an intelligent device on the network. Just like a PLC or a PC, it needs its own unique IP address to ensure that data packets intended for it are

delivered correctly and that its communications do not conflict with other devices on the same network segment.

63. If a PLC system does not have an Ethernet module, it can still communicate to a PC via what type of network?

Correct Answer: USB (or Serial)
Rationale: This reinforces a previous point. Many PLC models include built-in ports for direct, point-to-point communication with a programming device. Common alternatives to Ethernet include: o USB: For fast, modern connections. o Serial (RS-232/RS-485): For older or longer-distance direct connections. These methods create a simple network consisting of just the PC and the PLC. 64. A PLC using an Ethernet network cable would have what type of connector?
Correct Answer: RJ- 45
Rationale: The RJ-45 connector is the industry standard for copper-based Ethernet cabling (e.g., Cat5e, Cat6). It is an 8-position, 8-contact (8P8C) modular connector, larger than a standard telephone connector (RJ-11), and is used on PLCs, PCs, switches, and routers. 65. To de-energize the output controlled by a comparison instruction, N7: must be ______.
Correct Answer: none of these (or less than the comparison value)
Rationale: The study guide text states "none of these" for this specific question, implying that the provided options (which are not shown in the text) did not correctly describe the condition needed to de-energize the output. Based on the logic of a comparison instruction like GEQ (Greater Than or Equal To) or GRT (Greater Than), the output would de-energize when the condition becomes false. For a GRT instruction (Source A > Source B), the output de-energizes when N7:1 is less than or equal to the comparison value. 66. What value in Source A would cause remlight.7 to illuminate in a LES (Less Than) instruction with Source B set to 100?
Correct Answer: Anything below 100
Rationale: This reinforces the concept of the LES instruction. The instruction evaluates to TRUE when the value in Source A is less than the value in Source B. For remlight.7 (the output) to be illuminated, the rung must be TRUE. Therefore, Source A must contain any value that is less than 100 (e.g., 99, 50, 0, - 32768). 67. Math and Data Move instructions are output instructions that will only execute if the rung they occupy is true.

71. What is the proper sequence of operation within a PLC?

Correct Answer: Examine inputs, perform logic, update outputs
Rationale: This fundamental PLC scan cycle is worth repeating. The processor follows a strict, three-step sequence during each scan cycle:

Examine Inputs (Read): The CPU scans all input modules and copies the status (ON/OFF) of each input into a specific area of memory called the "input image table."
Perform Logic (Execute): The CPU executes the user program (ladder logic) instruction by instruction, using the values stored in the input image table and the current values in memory tags to determine the new states for all outputs. These results are written to the "output image table."
Update Outputs (Write): Once the program scan is complete, the CPU copies the status of all outputs from the output image table to the physical output modules, energizing or de-energizing the field devices. 72. Which of the following statements describes PLC Program mode?

Correct Answer: Allows the user to download, upload, edit and save project files. The processor does not scan or execute the ladder program, and outputs are not energized.
Rationale: This is a detailed explanation of Program mode. It is a non-operational state used exclusively for configuration and maintenance. Key characteristics include: o No Scanning: The processor does not execute the user program. o Outputs Forced Off: All physical outputs are de-energized as a safety precaution. o File Transfer: The user can download (PC to PLC) or upload (PLC to PC) project files, make edits, and save configurations without interfering with a running process. 73. Which switch controls the Reverse limit?
Correct Answer: LS
Rationale: In standard industrial control schematics, limit switches are designated with "LS" followed by a number. While numbering conventions can vary by designer, a common practice is: o LS1: Forward limit switch (stops forward travel) o LS2: Reverse limit switch (stops reverse travel) o LS3: Home or position switch, etc. Therefore, LS2 is typically the switch that would be activated to stop the motor in the reverse direction. 74. One of the advantages of a PLC is that it permits many instructions to be controlled by one _____.
Correct Answer: Tag or address

Rationale: This highlights a key advantage of software-based control over hard- wired relay logic. In relay logic, a physical contact can only be wired in a limited number of places before it becomes impractical or unreliable. In a PLC, a single tag or memory address (representing an input, output, or internal bit) can be referenced by an unlimited number of XIC, XIO, OTE, and other instructions throughout the entire program. This is often referred to as having "unlimited virtual contacts." 75. Tags with a DINT data type contain how many bits?
Correct Answer: 32
Rationale: DINT stands for "Double INTeger." This data type is commonly used in PLC programming (especially in Rockwell Automation/Allen-Bradley controllers) because it is the default data type for many processors, making operations efficient. A 32-bit DINT can store integer values ranging from - 2,147,483,648 to 2,147,483,647. 76. The most common method of controlling a motor with a PLC is to use what?
Correct Answer: A motor starter
Rationale: A motor starter is the standard interface between a PLC and an AC motor. It consists of two main components:

Contactor: An electrically operated switch that uses a low-power coil (controlled by the PLC output) to open and close high-power contacts that supply voltage to the motor.
Overload Relay: Protects the motor from drawing excessive current (overheating) by opening a set of contacts if an overload condition occurs. These contacts are often wired back to a PLC input for monitoring. 77. What function do the highlighted instructions perform in a program with motor interlocking?

Correct Answer: Program interlocking
Rationale: Interlocking is a critical safety feature in applications where two outputs must never be energized at the same time (e.g., Forward and Reverse motor contactors). Program interlocking is achieved by wiring the logic so that each output's rung contains a normally closed (XIO) contact from the other output. This ensures that if the Forward output is energized, its XIO instruction on the Reverse rung is open, preventing the Reverse output from being energized, and vice versa. 78. What would happen if PB3 (the Down pushbutton) failed to close when pressed?
Correct Answer: The door would move up, but not down
Rationale: This describes a classic failure mode in a two-button control station. Assuming the circuit is correctly designed:

Rationale: An absolute I/O address is like a GPS coordinate for a field device. It provides a complete map to the exact physical connection point. For example, in the address Local:2:I.Data.3: o Local: Indicates the main chassis or rack (as opposed to a remote rack). o 2 : Specifies the slot number in the chassis where the input module is located. o I: Identifies the module type (Input module). o Data: Refers to the data file for that module. o 3: Indicates the specific terminal number on the module (e.g., terminal 3). This allows a technician to trace a wire from a field device directly to the correct terminal on the correct module. 82. Based on the diagram below, which statement accurately describes when Y output will be energized?
Correct Answer: X1 = true, X2 = false, X3 = true
Rationale: This configuration is typical of a control circuit with interlocking and permissive conditions. The logic likely requires: o X1 (Start Permissive): Must be TRUE to allow the circuit to operate (e.g., a master control relay or mode selector). o X2 (Interlock): Must be FALSE to ensure a conflicting condition is not present (e.g., a reverse limit switch on a forward circuit). An XIO instruction is used for X2. o X3 (Run Command): Must be TRUE to initiate the action (e.g., a start pushbutton). With X1 and X3 in series (both must be TRUE) and X2 in series as an XIO (must be FALSE), the only combination that satisfies all conditions is X1=TRUE, X2=FALSE, X3=TRUE. 83. Given the information below, which output will cause the motor to run in the Forward direction?
Correct Answer: Local:4:O.Data.
Rationale: The address Local:4:O.Data.0 provides three critical pieces of information:

Slot 4: The output module is located in slot 4 of the chassis.
Output Module (O): This is an output module, meaning it sends signals to field devices.
Terminal 0 (Data.0): The signal is coming from the first terminal (terminal 0) on that module. The I/O wiring diagram would show that terminal 0 on the module in slot 4 is physically wired to the coil of the forward contactor in the motor starter. When the PLC sets this bit to 1, the output energizes, pulling in the forward contactor and starting the motor in the forward direction. 84. In the Power Diagram below, if the motor runs in the Forward direction, the screw moves to the right. If the motor runs in the reverse direction, the screw

moves to the left. If a technician was using an HMI panel to monitor or test a process, they would be interacting with what?

Correct Answer: Objects
Rationale: This reinforces a key HMI concept. An HMI panel presents a graphical representation of the machine or process. Technicians interact with graphical "objects" such as: o Pushbutton Objects: Used to start or stop actions. o Indicator Objects: Lights or shapes that change color to show status (e.g., motor running, valve open). o Numeric Display Objects: Show values like timer accumulations, temperature readings, or position data. o Slider Objects: Allow operators to set values like speeds or setpoints. Each of these objects is configured ("tagged") to a specific address in the PLC's memory. 85. If you want to set up Ethernet communication between a PLC and a PC, what two addresses MUST be configured correctly?
Correct Answer: IP address and Subnet Mask
Rationale: This fundamental networking concept is worth repeating. For two devices to communicate on the same IP network: o IP Address: Must be unique for each device. No two devices on the same network can share an IP address. o Subnet Mask: Must be configured identically on both devices. The subnet mask determines which portion of the IP address identifies the network and which portion identifies the host. If the subnet masks are incompatible, the devices may not recognize that they are on the same network and will be unable to communicate directly. 86. The HMI project is stored in the HMI memory.
Correct Answer: True
Rationale: Once the HMI configuration is complete in the development software, it is compiled into a file and downloaded to the HMI hardware. This file is stored in the HMI's non-volatile memory (such as flash memory or a compact flash card). This allows the HMI to retain its program and start up automatically when power is applied, without needing to be connected to the development PC. 87. When using an HMI panel connected to an Ethernet network, it must have a unique IP address.
Correct Answer: True

SACA C-207 Programmable Controller Systems 1 Exam Prep 2026: Complete Study Guide, Exams of Computer Science

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SACA C-207 Programmable Controller Systems 1 Exam Prep

2026 : Complete Study Guide with Practice Questions, PLC

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