Micromod Micro-DCI: 53MC5000 Multi-Loop Process Controller Manual do Utilizador descarregar pdf (Página 132)

A.1.6 CS20 - TWO-LOOP CONTROLLER

The two-loop controller provides two standard PID controllers in a single cabinet enclosure.

Loading CS20 initializes the ANI1 engineering span to 100.0 and the display list sequence to incor-

porate a second display group (CON1). The control scheme is shown in block diagram form in Fig-

ure A-6. Also provided is Table A-6, which is a worksheet that shows the CS20 wirelist con-

nections; wirelist datapoints not connected are left at default. Table A-6 is partitioned by FCS mod-

ule type applicable to CS20 (those modules illustrated in Figures 2-1 and 2-2). The datapoint pa-

rameters for each module are shown with their default values.

The following I/O assignments result from loading CS20:

ANI0 Process Variable Loop 1

ANI1 Process Variable Loop 2

ANI2 Remote Setpoint Loop 1

ANI3 Remote Setpoint Loop 2

ANO0 Control Output Loop 1

ANO1 Control Output Loop 2

CCI0 Remote Enable Loop 1

CCI1 Remote Enable Loop 2

CCO0 Process Alarms Loop 1

CCO1 Process Alarms Loop 2

Each loop has its own assigned individual set of parameters for operation control, allowing the

loops to be fully independent. The description that follows is for Loop 1, with Loop 2 referenced

parenthetically.

The input/output configuration for both loops is the same: process variable, remote setpoint, re-

mote setpoint enable, control output, and alarm status. Only the process variable and control out-

put signals are essential for standard loop control purposes; the other signals do not have to be

configured. Process variable, ANI0 (ANI1), is the controlled parameter, and control output, ANO0

(ANO1), is the regulator signal. When a closed contact is present on CCI0 (CCI1), remote setpoint

selection is possible using the R/L push button. While remote setpoint is selected, the control set-

point value is obtained from ANI2 (ANI3). Whenever an alarm condition associated with the control

loop occurs, the CCO0 (CCO1) contact is closed; otherwise, the contact is open.

FCS 53MC5000 Flexible Control Strategies

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Micromod Micro-DCI: 53MC5000 Multi-Loop Process Controller Manual do Utilizador Página 132