Siemens SITRANS PCS 7 Function Manual page 273

A dynamic monitoring error is generated if:
● The "Closed" end position is targeted (MV ≤ PosDiClose) and this position
(FbkCloseOut) is not reached within the monitoring time MonTiDynamic.
● The "Closed" end position is targeted (MV ≤ PosDiClose) and the feedback of the binary
limit switch FbkClose is already within the operating range.
● The "Open" end position is targeted (MV ≥ PosDiOpen) and this position (FbkOpenOut) is
not reached within the monitoring time MonTiDynamic.
● The "Open" end position is targeted (MV ≥ PosDiOpen) and the feedback of the binary limit
switch FbkOpen is already within the operating range.
Static monitoring
The monitoring is based on the effective feedback signals FbkOpenOut and FbkCloseOut
and not on the feedback inputs FbkOpen and FbkClose.
Monitoring is only active if the control valve is in the "Closed" or "Open" position and not in the
neutral position. The "Closed" position is determined by the PosDiClose parameter and the
"Open" position by the PosDiOpen parameter.
A static monitoring error is generated if:
● The "Closed" end position (FbkCloseOut = 1) is exited without a command having been
issued first and the monitoring time MonTiStatic has expired.
● The "Closed" end position is reached (FbkCloseOut = 1), the feedback for the binary limit
switch FbkClose is gone, and monitoring time MonTiStatic has expired.
● The "Open" end position (FbkOpenOut = 1) is exited without a command having been
issued first and the monitoring time MonTiStatic has expired.
● The "Open" end position is reached (FbkOpenOut = 1), the feedback for the binary limit
switch FbkOpen is gone, and monitoring time MonTiStatic has expired.
Deactivate feedback
This block provides the standard "Disabling feedback for valves" function that is described in
the APL Online Help. Feedback monitoring can be deactivated separately for each feedback
with NoFbkOpen or NoFbkClose as required.
Suppressing messages using the MsgLock parameter
This block provides the standard "Suppressing messages using the MsgLock parameter"
function that is described in the APL Online Help.
Monitoring the feedback for the auxiliary valve
The auxiliary valve provides dynamic and static monitoring of the feedback. No special
monitoring time can be configured for overseeing the retention of the end position of the
auxiliary valve. If the end position is exited without the corresponding command, a "monitoring
runtime error" is reported after expiration of the time configured under "Control".
Monitoring is disabled by default and no connections are displayed.
SITRANS Library for PCS 7
Function Manual, 05/2019, A5E35351976-11
SIPART PS2 PA
8.1 SipPS2PA
273