Rockwell Automation 1772-LV Mini-PLC - 2/15 Programmable Controller (Series B) Programming and Operations - Manual (Page 163)

Chapter
12
12Ć1
Run Time Errors
In this chapter you will read:
What are run time errors?
Diagnosing a run time error.
Causes of 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 the run or test modes, if a run-time error occurs, your processor will halt
program operations and the processor and memory indicators will illuminate a
red color. In the run/program mode you get no indication because the processor
is automatically switched to the program mode.
The following are steps on how to diagnose run 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 will be replaced by the display showing the run-time error
message.
3. Turn the keyswitch to the PROG position.
4. Press [1][1] to display the instruction that caused the error.
5. Correct the run time error by editing your program. (Refer to Table 12.A.)
6. Restart your processor.
Objectives
What are Run Time Errors?
Diagnosing a Run Time Error