Micromod Micro-DCI: 53MC5000 Multi-Loop Process Controller Instrukcja Użytkownika Pobierz pdf (Strona 28)

2.7.14 DEVIATION/ALARM CALCULATION 0

The Deviation/Alarm Calculation 0 (D/C 0) 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 0 module follows the tables.

Inputs

WIRELIST SYMBOL DATA

TYPE

ASSIGNED VALUE

B152 PV0 C

B153 SP0 C

Output Datapoints:

C119, C121, L110, L111

Parameters Parameters

SYMBOL DATAPOINT ASSIGNED VALUE SYMBOL DATAPOINT ASSIGNED VALUE

T1-0 C117 PL2-0 C104

CZ0 C114 ADB0 C105

PL1-0 C103 AIX0 B335

ADB0...alarm dead band

AIX0...control alarm mode

CZ0...control zone

DV0...deviation

PA1-0...alarm A active

PA2-0...alarm B active

PL1-0...alarm limit 1

PL2-0...alarm limit 2

PV0...process variable

SP0...setpoint

T1-0...setpoint slew rate

TSP0...control setpoint

Section 2. FCS Modules

DAC-0

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Micromod Micro-DCI: 53MC5000 Multi-Loop Process Controller Instrukcja Użytkownika Strona 28