Program execution starts when power is turned on. it will be restarted automatically if a system reset, caused by
the deadman switch, occurs.
The video section provides the link between up to two (2) operators stations (keyboard and monitor) and the CPU.
it converts data from the CPU section into a composite video signal for display and contains the ports through
which the CPU section communicates with the keyboards. The system clock, deadman switch, and alarm output
control are also in this section.
The two potentiometers located on the bottom right of the board are monitor video gain adjustments. Refer to
Paragraph 6.0 for adjustment procedures.
Input Circuit Board (top board on Main Unit Door)
The input Board, an intelligent circuit card, is the data collecting unit of the system. it reads signal inputs from the
Rate, Switch, and Analog Modules, converts these signals to digital information and transmits the data to the
Process and Display Board.
Power Supply Circuit Board (small board on Main Unit Door)
This is the power supply which furnishes +15 VDC, -15 VDC and +5 VDC for PMS II operation. Required input
voltage is either 12 VDC or 24 VDC depending upon your system. Refer to system's installation Manual for this
Rate Input Module
Accepts rate (frequency pulses) inputs and couples these signals through a ribbon cable to the input board.
Switch Input Module(s)
Accepts switch closure [normally closed (NC) or normally open (NO)] inputs and couples these signals through a
ribbon cable to the input board.
Analog Input Module(s)
Accepts analog signal inputs from various type analog sensors and couples these signals through a ribbon cable to
the Input Board. These sensors are interfaced to the input PC Board through sensor headers which are plugged
into sockets on the Analog Module PC board. Due to the different headers required for different sensor types,
these modules are not interchangeable unless the headers for each channel are changed to remain with the
original sensor. Also located on the Analog Module PC board is a -10vdc regulated power source used for
excitation of some sensors.
Section 2 - Page 2