Vendor Specific Write Mask Register (72 Hex) - Comtrol DeviceMaster EtherNet/IP-Modbus EIP-MOD User Manual

| Vendor Specific Write Mask Register (72 Hex)

10.9. Vendor Specific Write Mask Register (72 Hex)
This service performs a write mask operation on one holding register in the Modbus Holding Registers table.
This service results in the DeviceMaster EIP-MOD gateway issuing a Write Mask Register function (function
code 0x16) to either the Shared Memory or the Modbus Message Routing subsystem. Refer to MODBUS
Application Protocol Specification V1.1b3.pdf at
Note: In order to use this service, the Enable Vendor Specific Modbus Object Services option on the EtherNet/
IP Stack Configuration web page must be selected.
Parameter
Service Code
Instance
Class
Attribute
Source Element
Source Length
Destination
DeviceMaster EIP-MOD User Guide: 2000664 Rev. A
www.modbus.org
Value
72 hex
10
44 hex
0
WrMaskRegReqData
6
WrMaskRegRespData Tag of structure type WrMaskHoldingRegResp
for more details.
Description
Directly corresponds to Modbus function code:
Write Single Holding Register (function code 22)
Modbus Device ID of 10
(Valid Range = 1 to 255)
Modbus Object
Not used
Tag of structure type WrMaskHoldingRegReq
Length in bytes of WrMaskRegReqData
Chapter 10. PLC Programming for Modbus Object (44 Hex) - 145