MHG 943 is an addressable input element with four inputs intended in cooperation with addressable C.I.Es Lites for automatic signalling of user defined exceptional state(s) of any
external device, which indicates this state either by closing or opening an electrical contact or by voltage received on the optoisolated input. Contacts can also be set as guarded.

The element communicates with C.I.E. on 4 consecutive addresses. The first one is set by the addressing preparation MHY 535. Activation of any input is signalled by blinking of a red LED and additional SMD LED of appropriate input. The element consists of printed circuit board with terminal blocks which is placed in a plastic box with removable transparent cover.

The element is powered by a pulse voltage from the detection line of C.I.E. It contains power supply for its own electronic circuits. Evaluation circuits of input can be set as optoisolated or for connection of switching contact. These inputs can as well be set as guarded, where with the external device an opening (FAULT) or closing (ALARM) contacts can be connected
simultaneously. At the same time the loop is guarded for interruption or a short-circuit.

Addressable part registers the communication from C.I.E., refers under appropriate address and sends information about input activation to the C.I.E.

Product is intended for operation with safe equipment in sense of ČSN EN 60950 and meets the requirements of input/output device ČSN EN 54-18.

When designing the detector must heed the recommendations and measures to reduce the impact of interference voltages and regulations for projection fire detection and fire alarm systems C.I.E.s.