beautypg.com

A.1.1 cs1 - single-loop pid controller – Micromod Micro-DCI: 53MC5000 Multi-Loop Process Controller FLEXIBLE CONTROL STRATEGIES User Manual

Page 92

background image

A.1.1 CS1 - SINGLE-LOOP PID CONTROLLER

The PID controller is designed to fulfill the requirements of a majority of process applications. It is
used in conjunction with other devices in a standard feedback control loop to automatically control
a process variable (PV) at a predetermined setpoint (SP). The proportional, integral, and deriva-
tive (PID) terms can be activated as needed. The control scheme is shown in block diagram form
in Figure A–1. Also provided is Table A–1, which is a worksheet that shows the CS1 wirelist con-
nections; wirelist datapoints not connected are left at default. Table A-1 is partitioned by FCS mod-
ule type applicable to CS1 (those modules illustrated in Figure 2-1). The datapoint parameters for
each module are shown with their default values.

The process variable input and the control signal output are the only essential signals in this con-
figuration. The other assigned functions do not have to be configured if they are not required. The
span of the feed forward (FF) input should be set to 0.0 if FF is not required.

The following I/O assignments result from loading CS1:

ANI0

Process Variable

ANI1

Remote Setpoint

ANI2

Additive Feed Forward Input

ANI3

Tracking Input

ANO0

Control Output

ANO1

Retransmitted PV

CCI0

Force Output Tracking (Open Contact)

CCI1

Remote Setpoint Enable (Closed Contact)

CCO0

Process Alarm 1

CCO1

Process Alarm 2

FCS 53MC5000 Flexible Control Strategies

A-2

411-TXT