This variable indicates the current state of the
Hold function. The value 'not-holding' is the
default and initial value. The value must be set
to 'not-holding' as part of Active-Actions and
when the conditions causing 'holding-prm' or
'holding-sec' are no longer true. The value
'holding-prm' must be set when the condition
(notTR-Flag & not RE-Flag & (PC-LS=QLS | LEM-Fail
TNE>NS-Max | (not LS-Flag & TPC > T-Out))) is
satisfied in state PC8:ACTIVE for the A Port. The
value 'holding-sec' must be set when the condition
(notTR-Flag & not RE-Flag & (PC-LS=QLS | LEM-Fail
TNE>NS-Max | (not LS-Flag & TPC > T-Out))) is
satisfied in state PC8:ACTIVE for the B Port.