REV 0, June 2005Page 26
Operation Manual SUPREMA
3. Description of the System
An MCI or an MPI module can be plugged into the MAI module for each input to ensure that each
sensor is supplied with the correct power and that the associated signals are evaluated correctly.
The bridge current, zero point, and sensitivity of the MPI modules can be adjusted by the use of
the display and the adjusting elements on the MAI module (required only when a sensor is
replaced).
Instead of sensors, switching contacts can also be connected to the MCI module for signal
input via the sensor power supply terminal and the signal input. The signal to be evaluated now
changes between the ”closed circuit” state (approximately 4 mA) and the ”alarm signal” state
(approximately 15 mA).
Functions:
• 8 slots for MPI, MCI, MFI or MSI modules.
• 1 slot for the MAR module (redundancy).
• Display and operating elements (bridge current, zero, sensitivity)
• 12-bit ADC, 11 channels, measurement of the signal voltage + sensor supply (24 VDC).
• Connection terminals for the sensors are on the MAT module (power supply, signals).
• Status LEDs for supply voltage, AD conversion, adjusting procedures.
• Sensors are monitored by evaluation of the measurement signals on the MDA module.
• Data transfer to the MDA module over the SPI bus.
· Euro card with a 96-way connector.
Up to 8 MAI modules can be installed in one rack for the evaluation of 64 input signals.
MCI Module (Current Input Unit)
When the following input signals are to be processed, one of these modules must be plugged
into the MAI module for each input signal:
MCI 10 0 ... 20 mA MCI 20 0 ... 20 mA
switching contact
0 ... 24 V
MCI 20 BFE (BFE = Smoldering Fire Detection)*
(Signal processing for 0 ... 20 mA especially for DF 8501, DF 8502,
DF 8510 fire detectors)
The module must be configured for the specific application.
(see section 5.3.3 Configuration of
the MCI-Module)
Functions:
• Current/voltage source for active sensors with outputs of 0(4) ... 20 mA
• Short-circuit current limitation for the power supply to the sensors (0.7 ... 2 A)
• Current limitation for the 0 ... 20 mA signal input (approximately 30 mA)
• Multiplier resistor, 100 Ohm (0 ... 20 mA = 0.0 ... 2.00 V)
• Signal input, 0 ... 20 mA, contact, or 0 ... 24 V
* With regard to fire and smoke detection, the SUPREMA has not been evaluated to any Canadian standard by
a third party agency.
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