Modbus Addresses For Gcp-30 Mux Values - Proconx GCP-MG User Manual

Only Modbus address 0001 can be accessed at all times. All other Modbus addresses
can only be accessed if the CAN communication between GCP-MG and GCP-30 has been
established. If this is not the case, Modbus exception code 0B Gateway target device
failed to respond is returned indicating the GCP-30 is not present on the CAN bus.
For the GCP-30 MUX data table, the GCP-MG acts as a transparent gateway between the
GCP-30 unit and the Modbus. Except for the device status register at Modbus address
0001, it does not perform any modification to the representation of the data values.
The Woodward "GCP-30 Series Genset Control" manual [GCP30] is the ultimate reference
for the encoding and representation of the data values. Please refer to the "Transmission
Telegram" table in Appendix C "Interface Control" of this manual for further details.
The following table shows the relationship between Modbus addresses and the so called
MUX identifiers or word numbers:
Block Modbus
address
3 0001
3 0002
3 0003
3 0004
3 0005
3 0006
3 0007
3 0008
3 0009
3 0010
3 0011
3 0012
3 0013
3 0014
3 0015
3 0016
3 0017
3 0018
3 0019
3 0020
3 0021
3 0022
3 0023
3 0024
3 0025
3 0026
3 0027
3 0028
UMGCPMG-2201
GCP-30 GCP-30 GCP-30 manual designator
MUX word no.
n/a n/a CAN device status register
Bit 1: 1 = CAN communication GCP-MG and GCP-30 OK
Bit 2-16: reserved for future use
0/1 1 Generator voltage delta V12
0/2 2 Generator frequency f
0/3 3 Actual generator real power P
1/1 4 Exponents
1/2 5 Real power set point value
1/3 6 Conversion factor steps to kW
2/1 7 Bus bar voltage delta V12
2/2 8 Mains voltage delta V12
2/3 9 Currently present alarm class
3/1 10 Control register 2
3/2 11 Actual mains interchange (import/export) real power
3/3 12 Control register 1
4/1 13 Alarm message IKD (SC06)
4/2 14 Internal alarm 6
4/3 15 Generator voltage delta V23
5/1 16 Generator voltage delta V31
5/2 17 Generator voltage delta V1N
5/3 18 Generator voltage delta V2N
6/1 19 Generator voltage delta V3N
6/2 20 Configuration [T1]-[T4]
6/3 21 Engine speed measured via the Pickup
7/1 22 Generator current in L1
7/2 23 Generator current in L2
7/3 24 Generator current in L3
8/1 25 Actual generator reactive power
8/2 26 Generator cos phi
8/3 27 Current reserve power in the system in kW
Modbus data reference
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