Rockwell Automation Publication 1756-RM003N-EN-P - October 2011 493
Chapter
13
Special Instructions
(FBC, DDT, DTR, PID)
The special instructions perform application-specific operations.
Topic Page
File Bit Comparison (FBC) 494
Diagnostic Detect (DDT) 501
Data Transitional (DTR) 508
Proportional Integral Derivative (PID) 511
Configure a PID Instruction 516
Use PID Instructions 518
PID Theory 530
If you want to Use this instruction Available in these languages Page
Compare data against a known, good reference and
record any mismatches
FBC Relay ladder 494
Compare data against a known, good reference,
record any mismatches, and update the reference to
match the source
DDT Relay ladder 501
Pass the source data through a mask and compare
the result to reference data. Then write the source
into the reference for the next comparison
DTR Relay ladder 508
Control a PID loop PID Relay ladder
Structured text
511
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