Function Parameter Index Reference
90 RS232 Communications Reference Manual 8/99
5.47 PID Function Block
Description
The PID label stands for Proportional, Integral, Derivative (3-mode) control action.
This block is part of
the Loops category. It looks like this graphically on the Control Builder.
INPUT - PV
Remote Set Point Signal (Eng. unit or %)
OTHER INPUTS
CONTROL OUTPUT
Feed Forward value in %
Output Track value in %
Output Track Command (ON/OFF)
Remote Bias Value for Ratio PID
Switch Inputs
(from SWO on LPSW function block)
External Mode request (from MDSW block)
Back Calculation Input (for Cascade control)
Working Set Point in EU
Alarm 1 Digital Signal
Alarm 2 Digital Signal
Autotune Indicator (ON = Autotune in progress)
A/M Output & Setpoint Mode indication
(to MDFL block)
Back Calculation Output (for Cascade control)
OTHER OUTPUTS
Dynamic Parameters:
Table 5-59 PID Dynamic Parameters
Parameter Index Type Use R/W Description
status 0 REAL C R block status (see section 5.2 for code list)
lsp 1 REAL C R/W local set point (eu)
lsp2 2 REAL C R/W local set point 2 (eu)
rem_mode 3 BOOL C R/W remote set point mode request {OFF, ON}
man_mode 4 BOOL C R/W manual output mode request {OFF, ON}
man_out 5 REAL C R/W manual output value –5 to 105 (%)
tune_req 6 BOOL C R/W limit cycle auto-tuning request {OFF, ON}
rsp_eu 7 REAL C R remote set point in eu for monitoring
deviation 8 REAL C R Deviation in eu for monitoring
pv 9 REAL C R Process Variable in eu for monitoring
WSP 10 REAL O R Working setpoint display in eu for
monitoring
OUT 11 REAL O R control output –5 to 105 (%)
MODE 12 REAL O R actual mode encoded
ALl 13 BOOL O R Alarm 1
AL2 14 BOOL O R Alarm 2
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