Micromod Micro-DCI: 53MC5000 Multi-Loop Process Controller FLEXIBLE CONTROL STRATEGIES - Manual (Page 124)

A.1.5 CS5 - RATIO AUTOMATIC/MANUAL STATION
The ratio automatic/manual station configures the controller into a ratio automatic/manual selector
with manual loading.
Loading CS5 generates the CON0 display mode to 5, CON0 setpoint mode to 1, and the ANI1 engi-
neering span to 100.0. The Ratio Auto/Manual Station is shown in block diagram form in Figure A-
5. Also provided is Table A-5, which is a worksheet that shows the CS5 wirelist connections;
wirelist datapoints not connected are left at default. Table A-5 is partitioned by FCS module type
applicable to CS5 (those modules illustrated in Figure 2-1). The datapoint parameters for each
module are shown with their default values.
The following I/O assignments result from loading CS5:
ANI0 Auto Input
ANI1 Remote Ratio Input
ANI2 Alarmed Variable
ANI3 Tracking Input
ANO0 Station Output
CCI0 Force Output Tracking
CCI1 Select Remote Ratio
CCO0 Process Alarm 1
CCO1 Process Alarm 2
The unit operates as a combination auto/manual selector, manual loader, and ratio station. Trans-
fer from automatic to manual is bumpless, after which the output may be manipulated via the out-
put push buttons. In automatic, the signal on ANI0 is modified by the ratio value, then is passed
through to the station’s output. A closed contact at CCI1 forces the value of the ratio to match
ANI1. When CCI1 has an open contact, the ratio value is set by the setpoint push buttons. The
station’s output tracks ANI3 when an open contact appears on CCI0 and output tracking is enabled
(L119 = 1). The station also provides alarming, based on an independent signal (ANI2). Alarm
conditions are reflected by CCO0 and CCO1.
FCS 53MC5000 Flexible Control Strategies
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