Micromod Micro-DCI: 53MC5000 Multi-Loop Process Controller Instrukcja Użytkownika Pobierz pdf (Strona 58)

2.7.36 CONTROL 3

The Control 3 (CON 3) module combines the operations of Deviation/Alarm Calculation (D/C) and

Proportional Integral Derivative (PID) modules. The D/C functionality of the CON 3 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 3 (AMS 3) module is in auto mode, the CON 3 CO output is forced

to equal the Auto Value (CO) out from the AMS 3 module.

The tables that follow list the input variables and the parameters. An illustration of the Control 3

module follows the tables.

Inputs

WIRELIST SYMBOL DATA

TYPE

ASSIGNED VALUE

B230 PV3 C

B231 SP3 C

B232 FF3 C

Output Datapoints:

C227, C229, C231, L182, L183

Parameters Parameters

SYMBOL DATAPOINT ASSIGNED VALUE SYMBOL DATAPOINT ASSIGNED VALUE

T1-3 C225 OL3 C218

CZ3 C222 IR3 C223

PL1-3 C211 PB3 C214

PL2-3 C212 TR3 C215

ADB3 C213 TD3 C216

AIX3 B350 MR3 C219

OH3 C217 RSW3 L178

Section 2. FCS Modules

CON-3

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