Vendor Specific Read/Write Holding Registers (73 Hex) - Comtrol DeviceMaster EtherNet/IP-Modbus EIP-MOD User Manual

| Vendor Specific Read/Write Holding Registers (73 Hex)

10.10. Vendor Specific Read/Write Holding Registers (73 Hex)
This service performs first write and then read operations on multiple holding registers in the Modbus
Holding Registers table. This service results in the DeviceMaster EIP-MOD gateway issuing a Read/Write
Holding Registers function (function code 0x17) to either the Shared Memory or the Modbus Message Routing
subsystem. Refer to MODBUS Application Protocol Specification V1.1b3.pdf at
details.
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 73 hex
Instance 10
Class 44 hex
Attribute 0
Source Element RdWrHoldingRegsReqData
Source Length 252
Destination RdWrHoldingRegsRespData Tag of structure type RdWrHoldingRegsResp
148 - Chapter 10. PLC Programming for Modbus Object (44 Hex)
Value
Directly corresponds to Modbus function code:
Read/Write Holding Registers (function code 23)
Modbus Device ID of 10
(Valid Range = 1 to 255)
Modbus Object
Not used
Tag of structure type RdWrHoldingRegsReq
Maximum length in bytes of RdWrHoldingRegsReqData
(Length must be greater or equal to length of request
message.)
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Description
DeviceMaster EIP-MOD User Guide: 2000664 Rev. A
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