Micromod Micro-DCI: 53MC5000 Multi-Loop Process Controller Instruction Manual - Manual (Page 88)

3.9 FUNCTION INDEXES (FIXs)
The controller’s functionality is determined by the Function Index (FIX), which is used to select a
broad range of control strategies and operations. A FIX is selected by entering its number into the
database System Module Function Index datapoint B000. (The database description and data entry
procedures follow in this section of the book.) The FIXs are described as follows:
•
FIX 0 Suspend State - The company logo appears on the display when a 0 is entered into
datapoint B000. The control program stops; however, inputs continue to be measured.
The totalizers and trends continue to update.
•
FIX 1 Flexible Control Strategy - The FIX 1 control algorithm has a set of function
modules that always execute in a fixed sequence; however, inter-module signal connec-
tions are flexible and can be selected to produce various Control Strategies. The resident
Control Strategies provided with the controller are signal connections that are mapped into
the database. Ten available control strategies are provided with the four loop controller
(five are provided with a single loop controller and eight are provided with a two loop
controller). The ten Control Strategies are listed here and described in Sections 6 through
15.
CS Application 1 Loop 2 Loops 4 Loops
CS1 Single Loop PID Controller
♦
*
• •
CS2 Analog Backup Controller
• • •
CS3 Ratio Controller
• • •
CS4 Automatic/Manual Station
• • •
CS5 Ratio Automatic/Manual Station
• • •
CS20 Two Loop Controller
♦
*
•
CS21 Two Loop Cascade Controller
• •
CS22 Two Loop Override Controller
• •
CS40 Dual Two Loop Cascade Controller
•
CS41 Four Loop Controller
♦
*
*Ready to use as described in Sections 6 (CS1), 11 (CS20), and 15 (CS41).
To create a Control Strategy, signals are sourced from and connected to modules with data-
point entries in the database. Because the signals are routed using datapoint entries in-
stead of physically altering wire connections, the process is called
soft-wiring and each
Control Strategy appears as a wirelist in the database memory. A wirelist is specified to be
executed by entering the Control Strategy number into the System Module Link List Load
datapoint B016 (e.g. 1 for CS1, 20 for CS20, 41 for CS41, etc.). When a wirelist is created
to produce a Control Strategy that meets unique process application needs, it is called a
Flexible Control Strategy (FSC). To do this requires understanding the information pre-
sented in Instruction Bulletin 53MC5000 Flexible Control Strategies. The FCS procedure
can also be applied to alter an existing Control Strategy even if only minor enhancements
are needed.
•
FIX 97 Display Test - Entering a 97 into datapoint B000 causes a series of test patterns to
appear on the display. One pattern lights the dots around the outer edge of the display. A
second pattern lights the even numbered dots and a third pattern lights the odd numbered
dots. The control program stops but the database is not disturbed.
Section 3. Product Description
3-5