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Since October EES is delivering its universal fault annunciator series “USM” with the free of charge Modbus TCP implementation.
The device operates always as a Modbus slave (passive Modbus) with a Modbus address between 1 and 255. If Modbus TCP is used, the IP address of the communication partner (Modbus master) or for Modbus RTU the settings for the serial interface must be set in the parameterization which is accessible on the device through a Webserver. Then data is accessible via Modbus-registers or -coils.
Else also commands can be carried out using Modbus communication to trigger relays, acknowledgement commands or even to activate inputs in case of sparing the wiring.
To round off the flexibility with the USM from EES the protocols can be mixed together and by this form a gateway for maximum flexibility needs. Individual inputs can be set by Modbus TCP while forwarding the whole process image on IEC 61850.