The signal status of the
FbkCloseOut
and
FbkOpenOut
outputs is fetched and sent from the
worst signal status from the
RbkOut
output and the corresponding feedback signal inputs
FbkClose
and
FbkOpen
.
The signal status of the manipulated variable output
MV
always corresponds to the signal status
of the input parameter
MV_Ext
or
MV_Int
, depending on how the setpoint is specified. If the
internal manipulated variable
MV_Int
is used, the signal status 16#80 is always output.
The signal status of manipulated variable difference
ER
is fetched and sent from the worst
signal status of the two outputs
RbkOut
and
MV
.
The worst signal status
ST_Worst
for the block is formed from the following parameters:
●
FbkOpenOut.ST
●
FbkCloseOut.ST
●
FbkAuxVOpenOut.ST
●
FbkAuxVCloseOut.ST
●
RbkOut.ST
●
LocalLi.ST
Forcing operating modes
This block provides the standard "Forcing operating modes" function that is described in the
APL Online Help.
Note
If the block is operated with a auxiliary valve, the
OpenForce
and
CloseForce
commands
also affect the auxiliary valve.
The high range limit (
MV_HiLim
) and the low range limit (
MV_LoLim
) are output at
MV
for
OpenForce
and
CloseForce
respectively.
With
CloseForce
, the auxiliary valve is closed, thereby triggering the neutral position of the
control valve regardless of the
MV
output.
A configured ramp limit has no effect.
Feedback monitoring
This block provides the standard "Feedback monitoring" function that is described in the APL
Online Help.
Digital feedback signals for the "Open" and "Closed" positions are formed from the position
feedback:
● Feedback for "Open" position:
Rbk
≥
PosDiOpen
● Feedback for "Closed" position:
Rbk
≤
PosDiClose
SIPART PS2 HART
7.1 SipPS2HA
SITRANS Library for PCS 7
Function Manual, 05/2019, A5E35351976-11
201
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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