Rockwell Automation 1772-LS_LSP,D17726.8.6 PROG/OPER MANUAL-MINI PLC-2/05 - Manual (Page 222)

Chapter
19
19-1
Program Troubleshooting
This chapter describes special troubleshooting technique:
run time errors
bit
monitor/manipulation
contract histogram
force functions
temporary end instruction
ERR message for an illegal opcode
What are Run Time Errors?
Run time errors are errors that occur while the processor executes your
program, and are only apparent during this time. These errors result from
improper programming techniques. For example, it is possible to program
a series of instructions in which the processor cannot properly perform the
operation. Or it is possible to program paired instructions, such as a
Jump/Label, with improper syntax.
In remote test mode, if a run-time error occurs, your processor module
halts program operation. The RUN/FAULT indicator illuminates red. In
the run/program mode, you get no indication.
Diagnosing a Run Time Error
The following steps help you diagnose rung time errors:
1. Connect your industrial terminal to the processor.
2. Turn on the industrial terminal and notice the message, RUN-TIME
ERROR. If the industrial terminal is already connected, then your
ladder diagram is replaced by the display showing the run-time
error message.
3. Press 11 to display the instruction that caused the error.
4. Correct the run time error by editing your program
Chapter Objective
Run Time Errors