Rockwell Automation 1771-PD PID MODULE (+DU) - Manual (Page 44)

Chapter
3
3Ć1
Programming
Before starting to program the PID module, read this entire chapter
thoroughly. Be sure that the programming plug functions have been
selected as described in section titled Programming Plug Selection.
The PID module can be programmed in four general steps:
1. Choose the PID module features required for the application. These
are listed in section titled Capabilities (chapter 1) and are presented
in the algorithm flow chart (Figure 3.15).
2. Identify the control bits and loop storage words which must be
programmed to implement the features. These are defined in section
titled Word and Bit Definitions. Record the values of the storage
words and the logic state of the control bits on the worksheets found
in appendix A.
3. Write the ladder diagram program and assign data table addresses to
the data blocks used to store loop values. The examples presented in
appendix B or C should be used as guides.
4. Using a industrial terminal, enter the program into memory and the
block data into the data table. Refer to the worksheets on which the
values of the loop storage words have been recorded. Set the
appropriate control bits.
Sections listed below provide information for selecting PID module
features and programming the module.
Section titled Operational Overview provides an overview of the
programming concepts which are used to program and monitor the PID
module.
Section titled Word and Bit Definitions defines the words and bits
which can be used to program the module.
Section titled Algorithm Flow Chart contains the algorithm flow chart
and explains it use.
Section titled Block Transfer Programming explains how the module is
programmed using block transfer instructions.
General