9 – 67
MODBUS function codes
In addition to the MODBUS function codes of the COM16 module, described on page 9-63, the following definitions of the Status Register,
Control Bits, Extra Flags, Basic Types and Exception Status Bits apply to the COM16 module.
Status Register
The Status Register provides WL status information to the MODBUS master. The Status Register is accessed using the following functions:
- 02 Read Input Status Discretes
- 04 Read Input Registers
Bit number WL
0, 1
Circuit breaker position
00 = disconnected position
01 = connected position
10 = test position
11 = circuit breaker not present
2, 3
Circuit breaker status
00 = not ready
01 = circuit breaker open
10 = circuit breaker closed
11 = circuit breaker tripped
4 Circuit Breaker is ready to close
5 Undervoltage release
6 Closing spring charged
7 Overload warning
8 Setpoints active
9 Warning(s) active
10 MODBUS "Write enable" input active
11 User input
12, 13, 14
Tr ip
000 = no trip
001 = overload trip
010 = instantaneous short-circuit trip
011 = short time delayed short-circuit trip
100 = ground-fault trip
101 = trip caused by extended protective function
110 = N conductor trip
15 Load shedding
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