Omron SYSDRIVE 3G3RV Series

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• RS-422A

(4-wire)

Fig 6.57 RS-422A Wiring

nMessage

Format

RS-422A/485

communications,

the

master

sends

commands

the

slave,

and

the

slave

responds.

The

mes-

sage

format

configured

for

both

sending

and

receiving

shown

below,

and

the

length

data

packets

changed

the

command

(function)

contents.

The

space

between

messages

must

support

the

following.

Fig 6.58 Message Spacing

SDA

SDB

RDA

RDB

SDA

SDB

RDA

RDB

FG7

SDA

SDB

RDA

RDB

SDA SDB RDA RDB SG

95613

RS-422A

interface

Shielded cable

Code

Pin No.

B500-AL001 Link Adapter

Shielded cable

RS-422A/485

interface

Communications Board

9-pin D-sub connector

(Connector on cable: Male)

Code

Pin No.

Hood

Shielded cable

Code

Control cir-

cuit terminal

block (com-

munictions

terminals)

Code

SYSDRIVE RV

Control cir-

cuit terminal

block (com-

munictions

terminals)

Code

Pin No.

Code

Pin No.

Note Turn ON the terminating resistance switch at all Inverters.

Message data

(Request message or response

Slave address

(1 byte)

Function code

(1 byte)

Communications

data

Error check

(2 bytes)

Command message

Response message

Command message

PLC to Inverter PLC to InverterInverter to PLC

Time (Seconds)

24 bits long

H5-06

setting

24 bits long

5 ms min.

Omron SYSDRIVE 3G3RV Series

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