4.13 Slave CPU
The Slave CPU (Central Processing Unit) provides the interfacing signals and I/O’s required to allow
the FACP to connect / communicate to a variety of termination boards.
Automatic Termination Board Sensing
A unique feature of the Slave CPU is its ability to automatically sense the type of board it is
connected to without the user having to configure the board to suit. Board sensing is done by
measuring the voltage on analogue input ten (CN1-10), denoted Type Voltage. Each termination
board provides a unique predefined voltage. After the Slave CPU has determined the board type the
Slave CPU will set the appropriate operating conditions, signal the Main CPU of the installed type
and wait for the Main CPU to inform the Slave to begin executing the program.
Connections
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