EES delivers its universal fault annunciator series "USM" with the free of charge Modbus TCP implementation. For communication with superior or inferior third party systems in the control or process level, the annunciator provides one or two interface cards, while the latter is on surcharge providing also Modbus RTU, if needed. 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. To retrieve the respective information any 3rd party tool or device can be taken. EES offers a defined data structure as reports were e.g. various information about the inputs, collective reports, horn conditions or buttons pushed and all other options i.e. relay states can be read out. 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.

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