User Manual Owner's manual
Table Of Contents
- 1772-6.5.8, Mini-PLC-2/02, -2/16, -2/17 Processor, User Manual
- Important User Information
- Summary of Changes
- Table of Contents
- 1 - Using This Manual
- 2 - Fundamentals of a Programmable Controller
- 3 - Hardware Features
- 4 - Installing Your Programmable Controller
- 5 - Starting Your Processor
- 6 - Maintaining and Troubleshooting Your Processor
- 7 - Memory Organization
- 8 - Scan Theory
- 9 - Relay-Like Instructions
- 10 - Program Control Instructions
- 11 - Timers and Counters
- 12 - Data Manipulation and Compare Instructions
- 13 - Three-Digit Math Instructions
- 14 - EAF Math Instructions
- 15 - EAF Log, Trig, and FIFO Instructions
- 16 - EAF Process Control Instructions
- 17 - Jump Instructions and Subroutines
- 18 - Block Transfer
- 19 - Data Transfer Instructions
- 20 - Bit Shift Registers
- 21 - Sequencers
- 22 - Selectable Timer Interrupts
- 23 - Report Generation
- 24 - Program Editing
- 25 - Programming Techniques
- 26 - Program Troubleshooting
- A - Specifications
- B - Processor Comparison Chart
- C - Number Systems
- D - Glossary
- E - Quick Reference
- Index
- Back Cover
Program Troubleshooting
Chapter 26
26-10
An illegal opcode is an instruction code that theprocessor does not
recognize. It causes a run time error.
Important: The illegal opcode ERR message should not be confused with
ERR messages caused when a 1770-T1 or 1770-T2 industrial terminal is
connected to a processor that was using a 1770-T3 industrial terminal.
These industrial terminal ERR messages do not contain the 4-digit
hexadecimal value and will not cause the processor to fault.
If an illegal opcode occurs, compare the rung containing it to the
equivalent rung in a hard copy printout of the program. You must either
replace the error with its correct instruction or remove it. The ERR
message caused by an illegal opcode cannot be removed directly. Instead,
remove and replace the entire rung. You should identify and correct the
cause of the problem and correct the ERR message.
ERR Message for an
Illegal Opcode