Micromod Micro-DCI: 53MC5000 Multi-Loop Process Controller CUSTOMIZATION GUIDE - Manual (Page 34)

G04
DEVIATION/ALARM CALCULATION - 0
INPUTS NAME SYMBOL DATAPOINT
SETPOINT SP0 C101
PROCESS VARIABLE PV0 C100
PARAMETERS SETPOINT SLEW RATE T10 C117
CONTROL ZONE CZ0 C114
ALARM INDEX AIX0 B335
ALARM LIMIT 1 PL10 C103
ALARM LIMIT 2 PL20 C104
ALARM DEADBAND ADB0 C105
OUTPUTS
DEVIATION DV0 C121
ALARM A PA10 L110
ALARM B PA20 L111
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.
MODULAR CONTROLLER CUSTOMIZATION GUIDE
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