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7.7 Operation commands (Communication/Modbus)

7-15

Communication

(Modbus)

Response frame

Response codes

Command/response example

Operation command to channel 2 (client address: H'01)

Channel 2 operation command

Address : H'0000

Written data: H'0111 (Stop command to channel 2)

Data name Explanation

Client address The value from the command frame appears here.

Function code

This is the received function code.

In an error response frame, "H'80" is added to the

received function code to indicate that it is an error

response.

Example: Received function code = H'06

Function code in error response frame = H'86

Beginning

address of write

Beginning address of write that was received.

Written data Received operation command data.

CRC-16

This is a check code calculated from the client address

to the data end. For the calculation method, see "7.2

Frames ■ Command frame ● Example of CRC-16 cal-

culation" (P.7-4).

Response

H’06 H’00 H’00

Slave

address

Function

mode

Write start

address Write data

CRC-16

2 bytes2211

Function

code

Error

code

Error name Cause

H'86

H'02 Variable address error The variable address is not H'0000.

H'03 Variable data error

Error in written data.

• Incorrect command code or related informa-

tion.

H'04 Operation error

The operation state does not permit writing.

• Write via communication is OFF (disabled).

Note that the command is received regardless

of write via communication ON/OFF.

• Cannot process.

See explanation of commands in "7.9 Com-

mands and responses (Communication/Mod-

bus)" (P.7-17).

Unit error, unit change, display unit error, non-

volatile memory error

H'06 − Normal end No error

Command:

Response:

00 00

01 11

(CRC-16)

Brand	Omron
Model	E5AR - MANUAL 2
Category	Controller
Language	English

Omron E5AR - MANUAL 2 User Manual

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Omron E5AR - MANUAL 2 Specifications

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