User`s manual

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56

FX3U Series Programmable Controllers

User’s Manual - MODBUS Serial Communication Edition

7 MODBUS Standard Commands

7.10 Read Exception Status (Command Code: 0x07)

7.10 Read Exception Status (Command Code: 0x07)

Reads error status.

1) Request message format (Master → Slave)

2) Response message format (Slave → Master)

(When completed normally)

*1. Vendor specific data.

(When completed with an error)

*2. Exception and error codes are stored in special data registers and special auxiliary relays in the case

of error completion. Refer to Chapter 6 for storage location, confirmation methods, and other detailed

contents.

Function code

Function code

(07

H)

Data

Function code

Function

code

(07

H)

Error

information

*1

Data

Function code

Function

code

(87

H)

Exception

code *

2