ABB ITS2.1 - Modbus RTU; Modbus RTU Telegrams and Troubleshooting

ITS2.1 User Manual rev.04/1SEP622750P0001 25
7 MODBUS RTU
Default setting
19200 E,8,1
Default Modbus addr. 247
Baudrates
9600,
19200
Parity, stop
-
start bits
E,8,1
–
O,8,1
–
N,8,2
–
N,8,1
Modbus address range
1
–
247
7.1 Special sequence Modbus telegram
The parameters presented in the Main Measures menu is available as one contiguous block in the Modbus
mapping, making it easy and time saving to read the most common parameters from the ITS2.1 unit.
The following parameters can be read:
7.2 Modbus RTU trouble and fault finding
There are several ways to troubleshoot a Modbus line.
Assuming the Modbus line is OK hardware vice: correct polarity, no similar addresses, trouble with
termination, reading of Modbus register issues etc., a laptop with USB – RS-485 converter and Ekip connect
can be used for testing the Modbus line. It will even handle multidrop.
Modbus address
Parameters
Comment
100
-
104
L1, L2, L3
Actual current measure by the CT’s
150
-
152
V1N, V2N, V3N
Actual phase
voltages
154
-
156
V12, V23, V31
Actual line voltages
2
06
-
207
Ptot
Calculated 3 phase active power (kW)
2
14
-
215
Qtot
Calculated 3 phase reactive power (kvar)
304
-
305
Active energy total
Sum of positive and negative active energy (kWh)
2
50
-
252
Power
factor
Calculated 3 phase power factor
2
79
Temperature
Actual temperature measure on
the L2 cable terminal
4826
Status
Switch status and Fuse blown status