Micromod Micro-DCI: 53MC5000 Multi-Loop Process Controller CUSTOMIZATION GUIDE - Manual (Page 68)

F-CIM 57
DEVIATION/ALARM CALCULATION - 1
NOT REUSABLE
INPUTS NAME SYMBOL DATAPOINT
S n-1 SETPOINT SP1 C137
A PROCESS VARIABLE PV1 C136
PARAMETERS SETPOINT SLEW RATE T11 C153
CONTROL ZONE C21 C150
ALARM INDEX AIX1 B340
ALARM LIMIT 1 PL11 C139
ALARM LIMIT 2 PL21 C140
ALARM DEADBAND ADB1 C141
OUTPUTS
S n DEVIATION DV1 C157
ALARM A PA11 L134
ALARM B PA21 L135
TRUE SETPOINT TSP1 C155
Description:
This module calculates and loads the deviation value based on setpoint (S
n
) and
process variable (A). Before the calculation is performed the setpoint value is con-
ditioned so as not to exceed the rate of change limit specified by T1. If the calcu-
lated 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
3-16