Micromod Micro-DCI: 53MC5000 Multi-Loop Process Controller FLEXIBLE CONTROL STRATEGIES - Manual (Page 66)

3.0 FCS WIRELIST EXAMPLES
3.1 OVERVIEW
This section provides four Flexible Control Strategy wirelist examples. Each example has a brief
functional description of the control strategy, an illustration of the connected modules, and com-
pleted wirelist worksheets. Only those worksheets applicable to the control strategy are provided
with each example and not the entire worksheet set of Appendix B. The first three examples also
have event sequence tables to help understand the signal flow of the illustrated control strategy.
Because the fourth example is the last, it does not have an event sequence table, as at this point
the user should be capable of understanding the control strategy signal flow by reading the func-
tional description and referencing the illustration. The examples are provided in order of difficulty
as follows:
•
Logical Oneshot
•
Logic Operated Switch
•
High/Low Selector
•
Master Ratio Controller
It should be noted that all wirelist datapoint connections and Function Codes are listed in the
worksheet examples as three digit numbers (e.g., 031 for 31) so that the user can be confident a
number was not mis-recorded (e.g., 001 definitely specifies 1). The leading zeros are not required
and can be deleted when actually loading the PCS. Also, all worksheet entries are shown in en-
larged bold type.
It should also be noted that there are two dedicated datapoints, L070 and L071, which contain a
0 and a 1 respectively. These two datapoints can be used to prime or inhibit the effect of other
module input signals (e.g., if the Logic A module has an FC = 2 [A AND B] and one of its inputs is
tied to L071 [1], then the module output will be a 1 [true] every time the other input is a 1. L071 is
being used to prime the Logic A module for an output. The other input signal to the Logic A mod-
ule is called the enable, as the output is caused by its arrival. If L070 [0] were tied to the Logic A
module input and the same function code FC = 2 [A and B] was selected, then the output signal
would always be false [0]; L070 is called the inhibit because it prevents a true module signal out-
put). Other PCS database datapoints (e.g., C005) can be used in a Flexible Control Strategy as
temporary holding registers for numeric values providing the datapoint is not required by any PCS
functions. Examples 2 through 4 use L071 and other assigned datapoints as required.
The procedure to execute an FCS wirelist is provided in Section 2.5.
Section 3. FCS Wirelist Examples
FCSEX
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