TeSys TeSys Ultra LULC033 Modbus Communication Module – User Guide PDF
1743234EN-08

Connection to the RS-485 Bus

General

There are several ways in which the user can connect the communication module to the RS-485 bus:

  • Direct connection to the bus via a VW3A8306TF•• T-junction box

  • Connection to the bus via a splitter box

  • Connection to the bus via SCA type junction boxes

For Interference Protection:

Use the Schneider Electric cable with 2 pairs of shielded twisted conductors (references: TSXCSA100, TSXCSA200, TSXCSA500, VW3A8306TF••).

Keep the Modbus cable away from the power cables (at least 30 cm (12 in)).

Create crossovers of the Modbus cable and the power cables at right-angles, if necessary.

The RS-485 standard allows variants of some characteristics:

  • Polarization

  • Line terminator

  • Number of servers

  • Length of bus

The Modbus specification, published on the Modbus.org site, defines all these characteristics precisely. All new Schneider Electric devices conform to this specification.

Connection to the Bus via a Tee

The standard diagram corresponds to the Modbus specification published on the Modbus.org site and in particular to the 2-wire multidrop serial bus diagram.

The LULC033 Modbus communication module conforms to this specification.

The simplified diagram is as follows:

 

Client

Server 1

Server 2

The characteristics for direct connection to the bus are as follows:

Designation

Description

Type of trunk cable

Single shielded twisted pair cable and at least a 3rd conductor

Maximum length of bus

1000 m (3280 ft) at 19200 Baud with the Schneider Electric TSXCSA•• cable

Maximum number of stations (without repeater)

32 stations, i.e., 31 servers

Maximum length of tap-offs

  • 20 m (66 ft) for one tap-off

  • 30 m (100 ft) divided by the number of tap-offs on the multiple junction box

Bus polarization

  • A 450 to 650 Ω pulldown resistor at the 5 V

  • A 450 to 650 Ω pulldown resistor at the Common

This polarization is recommended for the client. There is no polarization at the RS-485 terminal on the communication module.

Line terminator

A 150 Ω resistor +/- 5%

Common polarity

Yes (Common), connected to the protective ground in at least one point on the bus

Connection to the Bus via a Splitter Box

The connection diagram for connection to the bus via a splitter box is as follows:

1 Client (PLC, PC or communication module)

2 Modbus cable depending on the type of client (with polarization integrated on the client side or on another part of the bus)

3 Modbus splitter box LU9GC3

4 Modbus drop cables VW3A8306R••

5 Line terminators VW3A8306R

6 Modbus T-junction boxes VW3A8306TF•• (with cable)

7 Modbus cable (to another splitter box) TSXCSA•00 (replaces (5)

NOTE: It is advisable to place a line terminator at each end of the bus to avoid malfunctions on the communication bus. This means that a tee should not have a free connector. It is either connected to a server or to the client, or there is a line terminator.
NOTE: It is important to connect the bus to the IN input (or the screw terminals on the bottom) of the splitter box. Connection to another splitter box is made via the OUT output.

Connection Diagrams (PLC - Splitter Box)

Example 1: Connection between TSXSCY21601 module (channel 0) and splitter box LU9GC3 using cable TSXSCYCM6030:

  1. Green/White

  2. White/Green

  3. Orange/White

  4. White/Orange

  5. Brown/White

NOTE: Check that the 470 Ω resistors are connected to the 0 V and 5 V polarities correctly.

Example 2: Connection between PCMCIA/TSXSCP 114 card and LU9GC3 splitter box using cable TSXSCPCX4030:

  1. Green/White

  2. White/Green

  3. White/Orange

  4. Orange/White

  5. Brown/White

NOTE: Check that the 470 Ω resistors are connected to the 0 V and 5 V polarities correctly.

List of connection accessories:

Designation

Catalog number

Modbus splitter box

10 RJ45 connectors and 1 screw terminal

LU9GC3

Modbus T-junction boxes

With 0.3 m (1 ft) integrated cable

VW3A8306TF03

With 1 m (3 ft) integrated cable

VW3A8306TF10

Line terminators for RJ45 connector

R = 150 Ω

VW3A8306R

List of connection cables:

Designation

Length

Connectors

Catalog number

Cables for Modbus bus

3 m (10 ft)

1 RJ45 connector and 1 stripped end

VW3A8306D30
  • 0,3 m (1 ft)
  • 1 m (3.3 ft)
  • 3 m (10 ft)

2 RJ45 connectors
  • VW3A8306R03
  • VW3A8306R10
  • VW3A8306R30

RS-485 double shielded twisted pair cables
  • 100 m (330 ft)
  • 200 m (660 ft)
  • 300 m (990 ft)

Supplied without connector
  • TSXCSA100
  • TSXCSA200
  • TSXCSA500

List of Modbus connection accessories for RJ45 wiring system:

Type of client

Interface with the client

Description

Catalog number

M221 or M241 or M251 or M262

RS-485 RJ45

Cable, equipped with 2 RJ45 connectors, of the following length:

  

BMXP341 or BMXP342
  • 0,3 m (1 ft)
  • 1 m (3.3 ft)
  • 3 m (10 ft)
  • VW3A8306R03
  • VW3A8306R10
  • VW3A8306R30

BMXNOM0200 or BMXNOR0200H

Twido PLC

Mini-DIN RS-485 adaptor or interface module

3 m (10 ft) cable equipped with a mini-DIN connector and an RJ45 connector

TWDXCARJ030

Screw terminal RS-485 adaptor or interface module

3 m (10 ft) cable equipped with an RJ45 connector and stripped at the other end

VW3A8306D30

TSX Micro PLC

Mini-DIN RS-485 terminal port

3 m (10 ft) cable equipped with a mini-DIN connector and an RJ45 connector

TWDXCARJ030

PCMCIA card (TSXSCP114)

Stripped cable

TSXSCPCX4030

TSX Premium PLC

TSXSCY11601 or TSXSCY21601 module (25-pin SUB-D port)

Cable equipped with a 25-pin SUB-D connector and stripped at the other end (for connection to the screw terminals on the LU9GC3 splitter box)

TSXSCYCM6030

PCMCIA card (TSXSCP114)

Stripped cable

TSXSCPCX4030

Fipio (LUFP1) or Profibus DP (LUFP7) or DeviceNet (LUFP9) gateway

RS-485 RJ45

Cable, equipped with 2 RJ45 connectors, of the following length:

  
  • 0,3 m (1 ft)
  • 1 m (3.3 ft)
  • 3 m (10 ft)
  • VW3A8306R03
  • VW3A8306R10
  • VW3A8306R30

Serial port PC

PC with 9-pin male SUB-D RS 232 serial port

RS 232/RS-485 converter

TSXSCA72

3 m (10 ft) cable equipped with an RJ45 connector and stripped at the other end (for connection to the screw terminals on the LU9GC3 splitter box)

VW3A8306D30

Connection to the Bus via SCA Junction Boxes

The connection diagram for connection to the bus via SCA junction boxes is as follows:

1 Client (PLC, PC or communication module).

2 Modbus cable depending on the type of client (with polarization integrated on the client side or on another part of the bus).

3 Modbus cable TSXCSA•00.

4 TSXSCA50 junction box (without line polarization).

5 TSXSCA62 subscriber port (without line polarization).

6 Modbus drop cable VW3A8306.

7 Modbus drop cable VW3A8306D30.

List of connection accessories:

Designation

Catalog number

Junction box

3 screw terminals and RC line terminator, connected with cable VW3A8306D30

TSXSCA50

Subscriber port

2 15-pin female SUB-D connectors, 2 screw terminals, and RC line terminator, connected with cable VW3A8306 or VW3A8306D30

TSXSCA62

List of connection cables:

Designation

Length

Connectors

Catalog number

Cables for Modbus bus

3 m (10 ft)

1 RJ45 connector and 1 stripped end

VW3A8306D30

5 m (16 ft)

1 RJ45 connector and 1 15-pin male SUB-D connector for TSXSCA62

VW3A8306

RS-485 double shielded twisted pair cables

100 m (330 ft)

Supplied without connector

TSXCSA100

200 m (660 ft)

TSXCSA200

300 m (990 ft)

TSXCSA300

List of Modbus connection accessories for junction box on screw terminals:

Type of client

Interface with the client

Description

Catalog number

M241 or M251 or M262

RS-485 RJ45

3 m (10 ft) cable equipped with an RJ45 connector and stripped at the other end

VW3A8306D30

BMXP341 or BMXP342

BMXNOM0200 or BMXNOR0200H

Twido PLC

Screw terminal RS-485 adaptor or interface module

Modbus cable

TSXCSA100 or

TSXCSA200 or

TSXCSA500

TSX Micro PLC

Mini-DIN RS-485 terminal port

Junction box

TSXPACC01

PCMCIA card (TSXSCP114)

Cable equipped with a special connector and stripped at the other end

TSXSCPCX4030

TSX Premium PLC

TSXSCY 11601 or TSXSCY 21601 module (25-pin SUB-D port)

Cable equipped with a 25-pin SUB-D connector and stripped at the other end

TSXSCYCM6030

PCMCIA card (TSXSCP114)

Cable equipped with a special connector and stripped at the other end

TSXSCPCX4030

Profibus DP (LA9P307) gateway

RS-485 RJ45

3 m (10 ft) cable equipped with an RJ45 connector and stripped at the other end

VW3A8306D30

Fipio (LUFP1) or Profibus DP (LUFP7) or DeviceNet (LUFP9) gateway

RS-485 RJ45

3 m (10 ft) cable equipped with an RJ45 connector and stripped at the other end

VW3A8306D30

Serial port PC

PC with 9-pin male SUB-DRS232 serial port

RS 232/RS-485 converter and

Modbus cable

TSXSCA72 and

TSXCSA100 or

TSXCSA200 or

TSXCSA500

RJ45 Connector Pinout

The communication module is connected to the Modbus network with an RJ45 connector in compliance with the following wiring:

Pin no.

Signal

1

Do not connect

2

Do not connect

3

Do not connect

4

D(B) or D1

5

D(A) or D0

6

Do not connect

7

Do not connect

8

0 V.L
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