ID-E342-001GB
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Fig. 5.1 POLON 4500 control panel block diagram
5.3 PSC-46 CENTRAL CONTROLLER MODULE
The central controller module is equipped with two independent microprocessor circuits (µP1 and µP2)
which ensure mutual supervision and unfailing control panel operation. Each circuit has an independent
set of ROM memory (in a separate MP-49 memory module), RAM operating memory and SETUP
configuration memory (set of data defining the hardware environment and system operation
organisation). In normal operating conditions, the whole control panel operation is managed by the first
microprocessor circuit (µP1), i.e. the active microprocessor. In case this circuit fails, the entire control
panel operation is monitored by the other (redundant) microprocessor circuit (µP2).
In this condition, µP2 is the active circuit.
The module also includes circuits creating the control panel bus for information exchange and
controlling other modules (MSL-1M, PPW-45, MSG-45, MIK-48 and MZ-48).
The PSC-46 has two transducers generating constant voltage of 3 V and 5 V to supply own and external
electronic systems.
5.3.1 Module signalling and handling elements
LEDs indicating the service conditions of the module operation are provided on the left internal edge of
the PSC-49 module.
At the back, two miniature push buttons marked as Reset µP1 and Reset µP2 are located below the MP-
49 module. They are used to restart a relevant µP1 or µP2 microprocessor (with short push button
pressing).
Summary of Contents for 4000
Page 25: ...ID E342 001GB 25 Fig 5 3 MSL 1M line module overview ...
Page 96: ...96 ID E316 001GB Fig 9 16 Non potential output exemplary connection ...
Page 101: ...ID E342 001GB 101 Fig 10 2 MSI 48 and MSI 48 Ed 3 network modules ...
Page 103: ...ID E342 001GB 103 Fig 10 3 Four control panels network connection with two pairs of cables ...
