When the control valve reaches the specified position, the output
PosReached
= 1 is set.
Dynamic monitoring
The monitoring is based on the effective feedback signals
FbkOpenOut
and
FbkCloseOut
and not directly on the feedback inputs
FbkOpen
and
FbkClose
.
The monitoring is only active if the control valve is within the control range. The operating range
is determined by the limits
PosDiClose
and
PosDiOpen
(
PosDiClose
< Rbk
<
PosDiOpen
).
When the control valve is within the control range, to reach one of the two end positions (
MV
≥
PosDiOpen
or
MV
≤
PosDiClose
), the targeted end position must be reached within the time
defined by
MonTiDynamic
.
If there are binary signals for the feedback of the control valve, the monitoring time for reaching
the configured values for the "Open" (
PosDiOpen
) or "Closed" (
PosDiClose
) position of the
manipulated variable is started (start
MonTiDynamic
if
MV
≤
PosDiClose
or
MV
≥
PosDiOpen
).
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.
SIPART PS2 HART
7.1 SipPS2HA
SITRANS Library for PCS 7
Function Manual, 05/2019, A5E35351976-11
203
Summary of Contents for SITRANS PCS 7
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Page 418: ...SITRANS P 10 2 SitraPDr SITRANS Library for PCS 7 418 Function Manual 05 2019 A5E35351976 11 ...
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