Instruction Manual

Data Structures and Expressions
A-5
initialized at the start of each scan from the loop auxiliary,
M_RESET.
MODE Integer
Loop operating mode auxiliary:
0 Manual
1 Automatic
2 Cascade
M_RESET Real PID manual reset auxiliary
MSV Real The tag name of the value passed from the last scanned step.
M_FLG Boolean
Manual flag. This loop is in automatic or cascade mode,
but was not on the previous scan.
OPHILM Real Loop output high limit auxiliary
OPLOLM Real Loop output low limit auxiliary
OUT Real Loop analog output auxiliary
PERIOD Real Loop scan time auxiliary
PRIMARY_FLG Boolean This controller is installed in the primary position.
PV Real Loop process variable auxiliary.
R_FLG Boolean
Reset flat. This is the first scan of this loop
since power up reset or new configuration.
RATIO Real Ratio auxiliary for PID ratio and bias subfunctions.
SCAN_TIME Real The actual time in seconds since this loop was last scanned.
SPAN
Real
Loop span. This is used to convert process
value to a fraction in the PID algorithm.
SPHILM Real Upper limit of setpoint [100]
SPLOLM Real Lower limit of setpoint [0]
SP_CUR Real Current setpoint value
SP_RATE Real Setpoint ramp rate limit [100]
SP_TARG Real Target setpoint value
STATE Integer Current batch state from sequence control function.
STATE_TIME Real Length of time (minutes) in current batch
state while not held.
TOD
Integer
Time of day counter. May be converted to
engineering units (seconds, minutes...) using
the T_... time conversion expression functions.