Protection
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Sepam - RS 485 network
connection guide
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Análise da Estratégia de Marketing Digital da Nike, Esquemas de Análise de Redes
Neste documento, é apresentada uma análise detalhada da estratégia de marketing digital adotada pela empresa nike. O texto aborda as suas principais iniciativas digitais, como a utilização de redes sociais, marketing de influencers, e-commerce e análise de dados. Além disso, são discutidos os resultados obtidos pelas iniciativas e as implicações para o futuro da estratégia da empresa.
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2023
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Protection
and control
Sepam - RS 485 network
connection guide
Introduction
Sepam protection units have an optional communication function.
Sepam 1000+^ and Sepam 2000 units may be connected to any 2-wire or
4-wire RS 485 communication network and exchange all the information
necessary for centralized control of the electrical installation via a
supervisory system, using Modbus master/slave protocol.
To reduce cabling errors, the cause of most problems encountered in the
implementation of communication networks, and limit those networks’
sensitivity to disturbances relating to the environment, a group of
accessories is available to make it easier to connect Sepam units to an
RS 485 network.
This manual presents:
5 general characteristics of RS 485 networks
5 accessories for connecting Sepam units to an RS 485 network
5 how to associate them, illustrated by a few examples.
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5 4-wire RS 485 network
Two-wire cabling of the communication network makes it possible to use a single shielded pair, which means simple cabling. Each item of equipment connected to the network includes a transmitter and a receiver that are connected to the same cable. Since communication is half duplex, alternating and two-way, messages are conveyed in both directions on the same line from the master to the slaves and vice versa. Communication takes place alternately, with the transmitters taking turns on the line. The master can be any station.
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The network comprises a single cable (a shielded, twisted pair). The various stations in the network are connected by linking both of the following:
all the outputs marked + (TD+, RD+) to the network + wire (marked L+)
all the outputs marked - (TD-, RD-) to the network - wire (marked L-).
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Two 150 Ω resistors (Rc) are required (one at each end) to match line impedance. Each item of equipment, as well as each connector, connection box or Sepam interface, contains a 150 Ω resistor which can be used for this purpose. 3RODUL]DWLRQRIWKH56QHWZRUN Polarization creates a continuous flow of current through the network, putting all the receivers in deactivated status until a transmitter is validated. The network is polarized by connecting the (L+) line to the 0 V and the (L-) line to the 5 V via two 470 Ω polarization resistors (RP). The network should only be polarized in one location on the line to avoid random transmission. It is recommended that the master’s power supplies and resistors be used. The ACE 909-2 and ACE 919 converters provide this polarization. Some Schneider equipment offers also this possibility.
3OHDVHQRWH Some equipment items do not comply with the RS 485 standard with respect to polarities as well as polarization and line impedance matching. When a mixture of equipment is being connected, make sure to check these points.
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For 4-wire connection of the communication network, 2 shielded pairs are used. With 4-wire connection, the “master station” is defined and then the two communication lines, a master to slaves “transmission” line and a slaves to master “receiving” line. Communication is alternating half duplex. Requests are sent from the master to the salves on the transmission line. Replies are sent from the slaves to the master on the receiving line. &RQQHFWLRQRIVODYHVWDWLRQV The different network are stations are connection by linking:
RD+ inputs to the L+ “transmission” line (A’)
RD- inputs to the L- “transmission” line (B’)
TD+ outputs to the L+ “receiving” line (A)
TD- outputs to the L- “receiving” line (B).
&RQQHFWLRQRIWKHPDVWHUVWDWLRQ The connection of the master station is the opposite of that of the slave stations:
RD+ input to the L+ “receiving” line (A)
RD- input to the L- “receiving” line (B)
TD+ output to the L+ “transmission” line (A’)
TD- output to the L- “transmission” line(B’).
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Rc = load resistor (150 ohms) Rp = polarization resistor (470 ohms) /LQHHQGLPSHGDQFHPDWFKLQJ Four 150 Ohm resistors (Rc) are mandatory (one at each end) for impedance matching of both the transmission and receiving lines.
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It is necessary to polarize both the transmission and receiving lines. Polarization of the transmission and receiving lines is not ensured by the Sepam interfaces.
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The ACE949-2 and ACE959 remote modules are connected to the C connector of the Sepam 1000 +^ base unit using the CCA612 prefabricated cable (L = 3 m). They are to be supplied by an external 12 Vdc or 24 Vdc ±10%, 500 mA supply. The 12 Vdc supply may be provided by the ACE909-2 or ACE919 converters.
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Rx+, Rx-: Sepam receiving (eq IN+, IN-) Tx+, Tx-: Sepam transmitting (eq OUT+, OUT-)
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Rear view of the CE40 board with communication coupler installed.
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Diagram of the communication coupler board for 2-wire or 4-wire RS 485 networks
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Rc = load resistor Rp = polarization resistor
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Each equipment item may be connected directly to a 2-wire RS 485 network via a CCA619 connector.
dimensions: 23 mm (L) x 70 mm (H) x 50 mm (D)
weight: 120 g.
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CCA619 is not at the end of the line: CCA619 is at the end of the line:
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The CCA600 connector may be used to make a cable of the appropriate length. A connector is supplied with the ACE909-2 and ACE919.
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The CCA602 cable is used to create branches of the RS 485 network from the CCA609 or CCA629 connection box to each equipment item. It may also be used to connect the ACE909-2 converter (master / central computer link). This 3-meter cable comprises 9-pin sub-D connector with a metallic cover at either end.
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The RS 485 network cable needed to interconnect CCA connection boxes or ACE type interfaces should have the following characteristics:
twisted pair with tinned copper braid shielding, coverage: > 65%
resistance per unit length: < 100 Ω / km
gauge: AWG 24
characteristic impedance: 120 Ω
capacitance between conductors: < 60 pF / m
conductor and shielding: < 100 pF / m.
The total network cable length should not be greater than PHWHUVexcept limitation due to distributed power supply. ([DPSOHVRIFRPSDWLEOHVWDQGDUGFDEOHV
supplier: BELDEN
5 single-pair cable, reference 9841 5 2-pair cable, reference 9842
supplier: FILOTEX 2-pair cable, reference FMA-2PS.
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cables with a pair dedicated to distributed power supply
5 resistance per unit length < 34 Ω per km 5 AWG 20 gauge
and 1 (or 2) pair(s) dedicated to the 2-wire or 4-wire RS 485 network
5 resistance per unit length: < 58 Ω / km 5 1 supply pair (red-black) 5 AWG 22 gauge
supplier: FILECA
5 2-pair cable, reference F2644- (1 red-black supply pair, 1 white-blue RS 485 pair) (cable distributed by Schneider Electric in 60 m strands, reference CCR301) 5 3-pair cable, reference F3644- (1 red-black supply pair, 2 white-blue and yellow-brown RS 485 pairs).
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For the sake of both the safety of people and efficient combating against the effects of interference, the cabling of systems which comprise digital links must comply with a set of basic rules aimed at establishing an equipotential-bonded, meshed and earthed network.
6SHFLDOFDUHPXVWEHWDNHQZKHQPDNLQJFRQQHFWLRQVEHWZHHQEXLOGLQJV ZLWKHDUWKLQJWKDWLVQRWLQWHUFRQQHFWHG For details and useful recommendations, please refer to the Schneider document DBTP 542 entitled “Modbus network guide”. All the accessories make it possible to ensure the continuity of the cable shielding and regular grounding. It is therefore necessary to ensure that:
the 2 connectors at the ends of the CCA 602 branching cable are plugged in
correctly and locked by the 2 screws specially provided
the clamps are tightened onto the metallic shielding braid on each CCA609,
CCA619, CCA629, ACE949-2, ACE959 connection box
each CCA connection box is grounded (earthed) by a 2.5 mm2 diameter green-
yellow wire or a short braid (< 10 cm) via the terminal specially provided
the metal case of the ACE909-2, ACE919 converter is grounded (earthed)
by a green-yellow mains power supply connector wire and an eye lug on the back of the case.
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The 110 Vac/220 Vac supply voltage is changed using a selector switch which may be accessed on the bottom of the box (fuse end).
3OHDVHQRWH This operation must be performed before energizing the converter.
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Used to set the rate and format of asynchronous transmission. To change the parameter setting, the box must be de-energized in order for the new values to be processed. The communication parameters should be the same as those of:
the RS 232 master (central computer)
the RS 485 slaves (Sepam).
The Sepam frame format (11 bits, 1 start, 8 bits, 1 parity, 1 stop) requires the following parameters:
SW2/4 = 0 with parity check
SW2/5 = 1 stop bit.
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SW2 / 4 0 with parity check 1 without parity check SW2 / 5 1 2 stop bits 0 1 stop bit
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mains power supply 220 Vac
9600 baud rate, 8-bit format, with parity, 1 stop bit
polarization and line impedance matching resistors activated.
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