User`s manual

FX3U Series Programmable Controllers

User’s Manual - MODBUS Serial Communication Edition

7 MODBUS Standard Commands

7.17 Mask Write Register (Command Code: 0x16)

Masks the values stored in a single holding register with AND or OR and writes the value.

The masked values written to the holding register are as shown below.

Result = (Current Contents AND And_Mask) OR (Or_Mask AND (NOT And_Mask)

1) Request Message Format (Master → Slave)

2) Response message format (Slave → Master)

(When completed normally)

*1. 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.

Data

(L) (L) (L)

Function code

Function

code

(16

Target holding register

number

(0000

H to FFFFH)

AND mask value

(0000

H to FFFFH)

OR mask value

(0000

H to FFFFH)

(H) (H)

(H)

Data

Function code

Function

code

(96

Exception

code*