MHY 923

Input/output device

Element MHY 923 is addressable element of FDFAS

Element MHY 923 is addressable element of FDFAS, which is intended:

  • to control and sensing of following devices related to fire protection
  • to connection and reset of special sensors of FDFAS

in addressable FDFAS LITES with C.I.E. MHU 109 and Firexa, manufactured by LITES Liberec s. r. o. Element is connected to detection line of the C.I.E. The address is set by help of addressable preparation MHY 535.

It contains one separately controllable bi-stable relay and one input for transmission of information to the C.I.E. This input allows checking of connected outer device controlled by built-inrelay, or it is possible to set output as independent. On this output it is possible to connect e.g. aspiration detector, where it is simultaneously connected normally closed contact (fault) andnormally opened contact (alarm).

Relay output is activated according to kind of connection and setting in configuration program of C.I.E.:

  • from C.I.E after fulfilment of entered conditions independently or depending on state of input
  • automatically during reset of C.I.E.. Relay has a function for reset of connected detector.

Electrical circuits of element are on the printed circuit board, which is placed in a plastic box with removable lid. Element contains input circuit, which can be plugged either as opto-isolated or for connection of normally open or normally closed contact. Input can be connected as a balanced, monitored for interruption and short-circuit with the possibility of transmission of fault of connected device. In guarded regime the activation of input of element MHY 923, connected in system Firexa, is indicated by flashing of LED on element.

Addressable part registers a communication from C.I.E, logs on set address and transmits the information .about situation on input, QUIET, ALARM, FAULT).

The possibility of using the input/output element MHY 923

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