Siemens SITRANS PCS 7 Function Manual page 316

SIPART PS2 PA
8.1 SipPS2PA
(2) Preview area
● "Manipulated variable external": Display current external manipulated variable
(MV_ExtOut).
● "Manipulated variable internal": Display current internal manipulated variable (MV_Int).
● "Manipulated variable difference": Current manipulated variable error (ER)
● "Permissible dev.": permitted ± deviation (PosDeadBand) of output manipulated variable. If
the manipulated variable feedback Rbk is within this range, the manipulated variable is
considered reached.
● "Limit Open": Limit (PosDiOpen) for forming the "Control valve Open" signal (FbkOpenOut).
If the position feedback reaches this limit, the control valve is open.
● "Limit Closed": Limit (PosDiClose) for forming the "Control valve Closed" signal
(FbkCloseOut). If the position feedback reaches this limit, the control valve is closed.
● "Track manipulated variable": (MV_TrkOn = 1) Manipulated variable is corrected to the
tracking value. Tracking value for the effective manipulated variable for "Track manipulated
variable"
With MV_TrkRbk = 1, Rbk is displayed here, with MV_TrkRbk = 0, MV_Trk is displayed.
● "Channel MV": Display of manipulated variable from output channel block
● "Auxiliary valve monitoring": Display of current monitoring time of the auxiliary valve.
● "Valve monitoring": Display of current monitoring time of the valve.
(3) Enabled operations
This area shows all operations for which special operator authorizations are assigned. They
depend on the configuration in the engineering system (ES) that applies to this block.
Symbols for enabled operations:
● Green check mark: The OS operator can control this parameter
● Gray check mark: the OS operator cannot control this parameter at this time due to the
process
● Red cross: The OS operator is generally prohibited from accessing this parameter due to
the configured AS operator control permissions (OS_Perm or OS1Perm).
The following enabled operationss are shown here:
● "Manipulated variable external": You can enable external manipulated variable specification
● "Manipulated variable internal": You can enable internal manipulated variable specification
● "Change MV": You can change the manipulated variable
● "Open": You can open the valve. The display always relates to the auxiliary valve and
control valve. Neither the auxiliary valve nor the control valve can be opened if there is no
enable.
For the control valve this means: If a new manipulated variable is greater than the current valve
position, this new manipulated variable take effect.
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SITRANS Library for PCS 7
Function Manual, 05/2019, A5E35351976-11