The Alarm Indicator, M4780 provide flush mounted LED based indication with 20 channels. Each channel can be used to indicate the state of one potential free contact.

All SELCO indicator units are available with either negative or positive reference. An insert paper label provides the opportunity to print a description or instruction right next to the related channel LED. The SELCO indicator units are available for both DC of AC supply. Input signals can be +24 VDC, +48 VDC or +110 VDC.

Additionally, M4780 is equipped with a serial RS485 communication bus with only 2 wires. The indications of the unit can be controlled via this serial bus as well as from the direct connections. The controls via the bus can be made from any device capable of operating as a MODBUS master, e.g. a PLC, a PC or the SELCO H0300 Event Logger.