Run time errors chapter 12 – Rockwell Automation 1772-LV Mini-PLC - 2/15 Programmable Controller (Series B) Programming and Operations User Manual
Page 164

Run Time Errors
Chapter 12
12Ć2
Table 12.A
Possible Causes of Run Time Errors
Instruction
Cause
Jump
Jumping from the main program into the subroutine
area or vice versa.
Jumping backwards.
Omitting the label instruction corresponding to the
jump instruction.
Jumping over a temporary end instruction.
Label
Multiple placement of the same label identification
number.
Removing a label instruction but leaving its referĆ
ence, the jump or jump to subroutine
instructions.
Jump to subroutine
To begin your main program.
To jump forward in your main program.
Use in the subroutine area.
Omitting a return instruction.
Omitting a corresponding label instruction.
Jumping over a temporary end instruction.
Return
Processor does not find a return instruction from the
subroutine area.
Using a return instruction outside the subroutine
area.
Files
AC>PR
Duplicating counter's address.
Manipulating the counter's accumulated value by
means of external programming
equipment or data highway hardware.
Sequencer
File address is out of range.
Preset value equals 0.
AC>PR
Block transfer
Giving the module address a nonĆexistent I/O rack
number.
Incorrect block length value.
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