REV 0, June 2005Page 28
Operation Manual SUPREMA
3. Description of the System
Reset of the Latching Alarms
• The fire detectors connected can be reset by a separate RESET button.
• The RESET button is short-circuiting terminals 3 and 3, this makes the supply voltage of
the fire detectors drop below the holding level.
MSI Module (SWITCH INPUT UNIT)
One MSI module must be plugged into the MAI module for each external switch being monitored.
The module must be configured for the relevant application.
(see section 5.3.19 „Configuration
of the MSI Module“)
Functions:
• Power supply for the switches.
• The output voltage of the module is limited to approximately 14 V and the output current is
limited to approximately 8 mA.
• Evaluate the status of the switches.
• In normal operation, the output voltage (UA) of the module is approximately 0,4 V, in an
alarm situation approximately 1,6 V, and at failures approximately 0 V.
• In an alarm situation the module is non-latching.
• If a latching function is required, it must be programmed in the SUPREMA settings.
Line control
At the last switch, an „END OF LINE” resistor must be installed.
In addition, each switch must be provided with a resistor connected in series.
If there is a short circuit or a failure, the output voltage switches to approximately 0 V.
Operation by an external power supply is optional.
MAR Module (Analogue Redundant Unit)
This module is used for the redundant processing of input signals in conjunction with a second,
redundant MDA module.
It is plugged into the MAI module. The analogue output signals of the MPI or MCI module are
digitised in parallel with the MAI module by a 12-bit ADC and transmitted over a separate SPI
bus to the second MDA module.
The function here is identical to that of the MAI module.
MDA Module (Data Acquisition Unit)
This module accepts the measurement values generated by the preceding Analogue Input
Modules (MAI modules), of which there can be a maximum of 8. This provides the signal process-
ing (calculates the mean) for a maximum of 64 sensors and the results are passed to the MCP
module via the CAN bus.
• Measurement values from the preceding MAI modules are read via the SPI bus.
• Measurement signals are processed in 100-ms cycles; the mean value is calculated over
a period of 1 sec.
• Data is transmitted to the MCP Module over the CAN bus.
• All supply voltages are monitored (EXT, INT and BAT).
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