How come can REF615 control circuit breaker using modbus or iec61850?

A modbus communication protocol manual for REF615 says control operations can be realized via 0x writable coils or 4x writable holding registers, but the communication management tool in PCM600 sees only 0x readable coils and 4x readable holdindg registers. Why? And why LN CBCSWI1 i cant see DAs for control a circuit breaker?