053481-00 Honeywell Input module

The CV can be set to 'NaN' if the SVP_REGCTL PV is bad or the CV range (CVEUHI/CVEULO) is bad.

The SVP_REGCTL block performs the following actions when the CV changes from good-to-bad.

l Sets BADCTLFL to 'ON' to indicate that a Bad Control condition exists.

TIP

l The SVP_REGCTL block performs the following when the CV is set to 'Bad.'

l requests its primary to initialize if the MODE is shed to 'MAN.'

l indicates to its primary that it is wound-up (ARWET = HiLo) and does not request the

primary to initialize if the MODE is not shed to 'MAN.'

l CV is prohibited to change its value until CV returns to good if the MODE was shed to

'MAN.'

l The SVP_REGCTL block performs the following when the CV changes from 'Bad' to

'Good.'

l remains at 'MAN' mode and continuously sends INITREQ to it primary if the MODE

sheds to 'MAN.' You must change the SVP_REGCTL's MODE to normal.

l clears it wind-up condition and performs a one-shot initialization if the MODE is not

shed to 'MAN.' In addition, it requests the primary to perform the one-shot

initialization.

If the CV is 'Good'

The SVP_REGCTL block determines if the CV is represented in terms of percentage or engineering

units (EUs). If the CV is in EUs, it is converted to percentage.

10.25.15 Output Limiting

This function enforces the following limit checks to the OP value because the MODE is not 'MAN.'

l Normal high or low limits (OPHILM and OPLOLM) - define normal high and low levels for the

OP value. If another function block or user program attempts to store an OP value that exceeds

OPHILM or OPLOLM, the value is clamped to the limit. Only the operator is allowed to store an

OP value that exceeds these limits. The following flags are set when the operator stores the OP

value.

o 'normal limit exceeded' flag (OPHIFL or OPLOFL)

o 'OP Anti-Reset Windup status'

l Extended high or low limits (OPEXHILM and OPEXLOLM) - define the extended high and low

limits for OP. If the operator attempts to store an OP value that exceeds OPEXHILM or

OPEXLOLM, the value is clamped to the limit.

ATTENTION

Default OP limit values for the SVP_REGCTL channel is same as the C300-PID block even if

the SVP_AO channel's OP limit values are 0% and 100% when the SVP_AO is configured as

'Incremental.'