The function block represents a Modbus server protocol instance in the protection relay. Function block settings include communication interface assignment for the instance, that is, Ethernet/TCP or serial.
A Modbus server protocol instance is activated if the function block instance is added to the application configuration. The setting Operation should be "On" and setting Port should have the communication interface assignment.
The STATUS output of the function block is active if Modbus client requests have been received on the communication interface within 15 seconds.
By default no Modbus data is mapped to the protocol interface. Protocol data has to be created using Communication Management in PCM600. There is only one mapping set provided. Several Modbus protocol instances can point to the same mapping set.
For more information on the Modbus server protocol, see the Modbus communication protocol manual.