Micromod Micro-DCI: 53MC5000 Multi-Loop Process Controller Manuale Utente Scaricare il pdf (Pagina 36)

G06

DEVIATION/ALARM CALCULATION - 2

INPUTS NAME SYMBOL DATAPOINT

SETPOINT SP2 C173

PROCESS VARIABLE PV2 C172

PARAMETERS SETPOINT SLEW RATE T12 C189

CONTROL ZONE CZ2 C186

ALARM INDEX AIX2 B345

ALARM LIMIT 1 PL12 C175

ALARM LIMIT 2 PL22 C176

ALARM DEADBAND ADB2 C177

OUTPUTS

DEVIATION DV2 C193

ALARM A PA12 L158

ALARM B PA22 L159

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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Micromod Micro-DCI: 53MC5000 Multi-Loop Process Controller Manuale Utente Pagina 36