User`s manual

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FX3U Series Programmable Controllers

User’s Manual - MODBUS Serial Communication Edition

7 MODBUS Standard Commands

7.11 Diagnostics (Command Code: 0x08)

7.11.14 Return bus character overrun count (sub-command code: 0x12)

Reads out the number of times the request message size exceeds the upper limit to the master.

1) Request message format (Master → Slave)

2) Response message format (Slave → Master)

(When completed normally)

*1. Refer to Chapter 6 for the relevant counts, count clear methods and precautions.

(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.

Note

Refer to Subsection 7.2.1 for details on the size of request messages.

(L)

Data

(L)

Function code

Function

code

(08

Sub-function code

(0012

(0000

(H)

(L)

Data

(L)

Function code

Function

code

(08

Sub-function code

(0012

Bus character overrun

count value

(0000

H to FFFFH) *

(H)

Data

Function code

Function

code

(88

Exception

code *