Applicable Systems
DVP
AH500
AS300
C2000
MS300
Symptoms
An STL or RET instruction is used incorrectly. The instruction sequence is invalid.
Possible Causes
- STL instruction used without proper LD prefix
- RET instruction used outside a subroutine or interrupt
Troubleshooting Steps
- Step 1: Locate the STL/RET instruction in error
Incorrect instruction sequence is identified - Step 2: Correct the STL/RET usage per the programming manual
Program compiles without error
How to Reset
To reset: Fix the STL/RET instruction sequence, then recompile and download.
Source: Delta DVP PLC Programming Manual, Delta Electronics
Category: PLC & VFD