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34

Presentation

The Modbus communication protocol is of the master/slave type.

Two exchange methods are possible:

Request/reply:

The request from the master is addressed to a specific slave.

The master waits for the reply to be returned by the slave polled.

Distribution:

The master distributes a request to all the slave stations on the bus.

These stations execute the instruction without sending a reply.

Zelio Logic modular smart relays are connected to the Modbus network via the

Modbus slave communication module. This module is a slave that is not electrically

isolated.

The Modbus slave communication module must be connected to an SR3 B

ppp

BD

modular smart relay, with a

c

24 V supply.

b

v

v

b

v

Configuration

The Modbus network slave communication module can be configured:

independently, using the buttons on the smart relay

(1)

.

on a PC, using “Zelio Soft 2” software, see page 9.

When using a PC, programming can be performed either in LADDER language or in

function block diagram (FBD) language, see pages 10 to 13.

b

b

Description

Modbus slave communication module

SR3 MBU01BD

comprises:

1

Two retractable fixing lugs

2

AModbus network connection (RJ45 screened female connector).

3

A communication LED (COM).

4

A “Power on” LED (PWR).

5

A screw terminal block for the protective earth connection.

6

A spring for clip-on mounting on a 35 mm mounting rail.

7

Two locating pegs.

8

Two locating pegs for clip-on fixing.

(1) Programming from the front panel and buttons on the smart relay is only possible in

LADDER language.

Modbus communication module

Characteristics :

page 36

Functions :

page 37

References :

page 42

Dimensions, mounting :

page 43

524131

Presentation,

description,

1

COM

SR3 MBU01BD

MB485-V1

PWR

6

1

8

8

2

5

3

4

1

7

7

Zelio Logic smart relays

1

Communication

Modbus slave communication protocol

1

2

3

4

5

6

7

8

9

10