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2.7.25 DEVIATION/ALARM CALCULATION 1

The Deviation/Alarm Calculation 1 (D/C 1) module calculates and loads a Deviation Value (DV),

based upon the Setpoint (SP) and the Process Variable (PV). Before the calculation is performed,

the setpoint value is conditioned not to exceed the T1 rate of change limit. If the calculated devia-

tion falls within the Control Zone (CZ) value, the deviation is forced to 0.0. This module also deter-

mines if alarm conditions exist based on the Control Alarm Mode (AIX), both alarm limits (PL1 and

PL2), and the Alarm Deadband (ADB). Results of the alarm tests are loaded into active alarms 1

and 2 (PA1 and PA2). The tables that follow list the input variables and the parameters (e.g., T1,

AIX, etc.). An illustration of the Deviation/Alarm Calculation 1 module follows the tables.

Inputs

WIRELIST SYMBOL DATA

TYPE

ASSIGNED VALUE

B191 PV1 C

B192 SP1 C

Output Datapoints:

C155, C157, L134, L135

Parameters Parameters

SYMBOL DATAPOINT ASSIGNED VALUE SYMBOL DATAPOINT ASSIGNED VALUE

T1-1 C153 PL2-1 C140

CZ1 C150 ADB1 C141

PL1-1 C139 AIX1 B340

ADB1...alarm dead band

AIX1...control alarm mode

CZ1...control zone

DV1...deviation

PA1-1...alarm A active

PA2-1...alarm B active

PL1-1...alarm limit 1

PL2-1...alarm limit 2

PV1...process variable

SP1...setpoint

T1-1...setpoint slew rate

TSP1...control setpoint

FCS 53MC5000 Flexible Control Strategies

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Micromod Micro-DCI: 53MC5000 Multi-Loop Process Controller Manuale Utente Pagina 43