Technical appendix
3433_en_C
PHOENIX CONTACT
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.
①
②
③
④
⑤
ST
PWR
G
W
PL ETH/UNI-B
U
S
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)
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