Vendor Specific Write Single Register Service (71 Hex) - Comtrol DeviceMaster EtherNet/IP-Modbus EIP-MOD User Manual

| Vendor Specific Write Single Register Service (71 Hex)

10.8. Vendor Specific Write Single Register Service (71 Hex)
This service writes one holding register to the Modbus Holding Registers table. This service results in the
DeviceMaster EIP-MOD issuing a Write Single Registers function (function code 0x06) to either the Shared
Memory or the Modbus Message Routing subsystem. Refer to MODBUS Application Protocol Specification
V1.1b3.pdf at www.modbus.org
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
for more details.
Value
71 hex
10
44 hex
0
WrSingleRegReqData
4
WrSingleRegRespData
Description
Directly corresponds to Modbus function code:
Write Single Holding Register (function code 6)
Modbus Device ID of 10
(Valid Range = 1 to 255)
Modbus Object
Not used
Tag of structure type WrSingleHoldingRegRequest
Length in bytes of WrSingleRegReqData
Tag of structure type WrSingleHoldingRegResponse
Chapter 10. PLC Programming for Modbus Object (44 Hex) - 143