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32 control 2 – Micromod Micro-DCI: 53MC5000 Multi-Loop Process Controller FLEXIBLE CONTROL STRATEGIES User Manual

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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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