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194
Apparatus control
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The apparatus control function contains several function blocks. These function blocks
are interconnected to form a control program reflecting the switchyard configuration.
A control program contains four main types of function blocks. The total number used
depends on the switchyard configuration. Beside the main types of function blocks the
program contains simple logic like AND/OR gates.
These four main types are called BAYCON, COMCON, SWICON, and BLKCON.
BAYCON:
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BAY CONtrol, used for bay-oriented functions (one per bay) such as reservation,
valid operator place, and supervision of select relays (when used).
COMCON:
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COMmand CONtrol, used for each apparatus. Supervises commands coming from
the different operator places. The interface to the operator places.
SWICON:
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SWItching CONtrol, used for each apparatus. Supervises operating apparatuses.
The interface to the process.
Figure 83 shows how the modules are combined:
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