Micromod Micro-DCI: 53MC5000 Multi-Loop Process Controller CUSTOMIZATION GUIDE - Manual (Page 37)

G07
DEVIATION/ALARM CALCULATION - 3
INPUTS NAME SYMBOL DATAPOINT
SETPOINT SP3 C209
PROCESS VARIABLE PV3 C208
PARAMETERS SETPOINT SLEW RATE T13 C225
CONTROL ZONE CZ3 C222
ALARM INDEX AIX3 B350
ALARM LIMIT 1 PL13 C211
ALARM LIMIT 2 PL23 C212
ALARM DEADBAND ADB3 C213
OUTPUTS
DEVIATION DV3 C229
ALARM A PA13 L182
ALARM B PA23 L183
Description:
This subroutine calculates and loads the deviation value based on setpoint (SP) and
process variable (PV). Before the calculation is performed the setpoint value is
conditioned so as not to exceed the rate of change limit specified by T1. If the
calculated deviation falls within the CZ value, then deviation is forced to 0.0. This
module also determines if alarm conditions exist based on AIX, PL1, PL2 and ADB.
Results of the alarm tests are loaded to PA1 and PA2. Refer to Section 4.1.6 of
Instruction Bulletin 53MC5000 for an explanation of AIX values.
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