TXP CLC Course
5
YN - Status display computer, criteria Indication
The application area YN is used for group, subgroup, and sub-loop controls. The
serial numbers are assigned sequentially for each step. The signals in this
application area are created to indicate missing criteria for a particular step. An
additional character "K" is used to indicate that a message will be printed out on
the alarm printer if the criteria is missing.
XS - Step signals from a functional group control
The step signals within this group represent step numbers within a functional
group using sequence control. The step signals are divided into two groups, they
are:
XS01 - XS49 Startup program
XS51 - XS99 Shutdown program
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