H0400 MODBUS Relay Unit provides a cost effective solution, with the possibility to monitor all kinds of equipment connected to a common 2-wire MODBUS.

The relay unit has 15 output relays and 1 monitoring output relay. Any change of status of any unit on the bus can be programmed to activate or deactivate any one of the 15 relays. The monitoring relay (number 16) has a special function; it is normally energized and will be automatically de-energized if there is a loss of communication with one or more units on the bus.

15 red LEDs indicate if any of the 15 output relays are activated. 1 green LED indicates if the connection to all slave units is ok.