51304516-250 Honeywell Controller module Brand new

PV and SP Processing

The SVP_REGCTL block accepts the following inputs.

l Process Variables (PV1 and PV2) from the SVP_AI channel based on the PVSOURCE

configuration.

l Set Point value from the AUXILIARY function blocks that reside in the C300 - 20mS CEE

Controller when the MODE is set to 'Cascade.'

Process Variable (PV) Processing – fetches the input values (PV1 and PV2) from the SVP_AI

channel based on the status (PV1STS and PV2STS) of the input values and gives the output PV

value. The inputs PV1 and PV2 act based on the selection of preferred PV source (PREFPVSRC)

parameter.

Set Point (SP) Processing – obtains the SP value from the AUXILIARY function blocks when the

MODE is set to 'Cascade' and processes it to perform SP limit checking, SP value must be within the

engineering unit range defined by PVEUHI and PVEULO.

10.25.2 PV handling when PVSTS is BAD

1. If the PVxSTS (x=1, 2) is set to 'BAD',

l the PVSTSFL.BAD is set to 'ON' in the SVP_REGCTL channel,

l MODE is set to 'MAN' in the SVP_AO channel.

l the calculated variable (CV) is set to 'NaN' to invoke Bad Control processing.

l the BADCTLFL is set to 'High.'

NOTE

l When the PV is 'Bad,' AO Mode change is prohibited until PVSTS returns to 'Normal'

if the MODE was in 'Shed.'

l When the PV returns to 'Normal,' the channel remains in 'Manual' mode if the

MODE was in 'Shed.' You must manually change the MODE to 'Normal.'

1. If the PVxSTS (x=1, 2) is set to 'Normal',

l the PV value is normal in SVP_AI channel, and

l the PVSTSFL.NORM is set to 'ON' in the SVP_REGCTL channel.