AUTOMATIC MODBUS MAPPING STRU CTU RE
APPENDIX
66
4JNO0 0030 8 A
Appendix A.3
Automatic Modbus Mapping Structure
Mapping for Field Devices
Table 19: Mapping for Field Devices
Parameter
Device no 1 in list
Device no 2 in list
Start Register
End Register
Start Register
End Register
Loop Current
40100
40101
40130
40131
PV
40102
40103
40132
40133
SV
40104
40105
40134
40135
TV
40106
40107
40136
40137
QV
40108
40109
40138
40139
PVStale
40110
-
40140
-
SVStale
40111
-
40141
-
TVStale
40112
-
40142
-
QVStale
40113
-
40143
-
Device Status
40114
-
40144
-
Battery Life
40115
40116
40145
40146
Extended Device Status
40117
-
40147
-
Communication Status
40118
-
40148
-
Number of WirelessHART
Neighbors
40119
-
40149
-
Note the following important information:
•
For every device, 30 registers are reserved. All new devices joining the network
are allocated registers in ascending order.
•
Devices are assigned registers in the order they join the WirelessHART net-
work.
•
Gateway supports function code 3 and holding registers only.
•
Modbus ID (a.k.a Slave ID) of the gateway is fixed to 255.
Mapping for Gateway Parameters’ Itself
Table 20: Mapping for Gateway Parameters
Parameter
Start Register
End Register
Reliability
40000
40001
Stability
40002
40003
Latency
40004
40005
Packets Lost Upstream
40006
40007
Time
40008
40009
Data Age
40010
-
Status
40011
-
WirelessHART device count
40012
-
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