Phoenix Contact GW PL ETH/UNI-BUS User Manual

Technical appendix
3433_en_C PHOENIX CONTACT 33/46
A Technical appendix
A 1 Modbus mapping
Each expansion module has a unique Modbus slave ID corresponding to the position (1 to
5) of the module in the station.
Figure A-1 Slave ID designation for expansion modules
For example, to read the Primary Value (PV) of a HART device connected to module 1,
configure the Modbus client to request registers 30256 and 30257 from Slave ID 1 of the IP
address of the head station.
①②③④ ⑤
STPWR
GW PL ETH/UNI-BUS
Modbus function codes 3, 4, 6, and 16 are supported.
Table A-1 Modbus registers
Module channel no. HART parameter Read/Write Type Modbus input register
Base 1 addressing
1 Primary Variable (PV) Read Float 30257 (MSW)
30258 (LSW)
Secondary Variable (SV) Read Float 30259 (MSW)
30260 (LSW)
Tertiary Variable (TV) Read Float 30261 (MSW)
30262 (LSW)
Quaternary Variable (QV) Read Float 30263 (MSW)
30264 (LSW)
Status
*
Read Word 30265
†
Loop Current Read Float 33207 (MSW)
33208 (LSW)

Phoenix Contact GW PL ETH/UNI-BUS Specifications

General

Brand	Phoenix Contact
Model	GW PL ETH/UNI-BUS
Category	Multiplexer
Language	English