Micromod Micro-DCI: 53MC5000 Multi-Loop Process Controller Manuale Utente Scaricare il pdf (Pagina 68)

F-CIM 57

DEVIATION/ALARM CALCULATION - 1

NOT REUSABLE

INPUTS NAME SYMBOL DATAPOINT

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

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

) 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.

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Micromod Micro-DCI: 53MC5000 Multi-Loop Process Controller Manuale Utente Pagina 68