Micromod Micro-DCI: 53MC5000 Multi-Loop Process Controller CUSTOMIZATION GUIDE - Manual (Page 73)

F-CIM 67
DEVIATION/ALARM CALCULATION - 2
NOT REUSABLE
INPUTS NAME SYMBOL DATAPOINT
S n-1 SETPOINT SP2 C173
A PROCESS VARIABLE PV2 C172
PARAMETERS SETPOINT SLEW RATE T12 C189
CONTROL ZONE C22 C186
ALARM INDEX AIX2 B345
ALARM LIMIT 1 PL12 C175
ALARM LIMIT 2 PL22 C176
ALARM DEADBAND ADB2 C177
OUTPUTS
S n DEVIATION DV2 C193
ALARM A PA12 L158
ALARM B PA22 L159
TRUE SETPOINT TSP2 C191
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
3-21