Micromod Micro-DCI: 53MC5000 Multi-Loop Process Controller Manuel d'utilisateur télécharger pdf (Page 52)

2.7.32 CONTROL 2

The Control 2 (CON 2) module combines the operations of Deviation/Alarm Calculation (D/C) and

Proportional Integral Derivative (PID) modules. The D/C functionality of the CON 2 module calcu-

lates the deviation (DV) value from the setpoint (SP) and the process variable (PV). Before the cal-

culation is performed, the setpoint value is conditioned not to exceed the T1 rate of change limit. If

the calculated deviation falls within the Control Zone (CZ) value, the deviation is forced to 0.0. If

the DV value exceeds parameter values that were entered for alarm limits PL1 and PL2, and the

Alarm Deadband (ADB), then Process Alarms PA1 and PA2 are activated as determined by the

Control Alarm Mode (AIX) parameter selection. The DV output from the D/C functionality is routed

internally as the DV input to the PID functionality, which means it can not be accessed as a wirelist

datapoint as would be the case if both modules were separate. The PID functionality computes the

Control Output (CO) signal based on the DV input from the D/C, other input variables, and parame-

ter entries (see Section 2.7.15 or 2.7.26 for PID formulas).

When the Auto/Manual Switch 2 (AMS 2) module is in auto mode, the CON 2 CO output is forced

to equal the Auto Value (CO) out from the AMS 2 module.

The tables that follow list the input variables and the parameters. An illustration of the Control 2

module follows the tables.

Inputs

WIRELIST SYMBOL DATA

TYPE

ASSIGNED VALUE

B216 PV2 C

B217 SP2 C

B218 FF2 C

Output Datapoints:

C191, C193, C195, L158, L159

Parameters Parameters

SYMBOL DATAPOINT ASSIGNED VALUE SYMBOL DATAPOINT ASSIGNED VALUE

T1-2 C189 OL2 C182

CZ2 C186 IR2 C187

PL1-2 C175 PB2 C178

PL2-2 C176 TR2 C179

ADB2 C177 TD2 C180

AIX2 B345 MR2 C183

OH2 C181 RSW2 L154

Section 2. FCS Modules

CON-2

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Micromod Micro-DCI: 53MC5000 Multi-Loop Process Controller Manuel d'utilisateur Page 52