Applicable Systems
DVP
AH500
AS300
C2000
MS300
Symptoms
An STL or LD instruction is used incorrectly. The ladder logic structure is invalid at the error point.
Possible Causes
- STL instruction placed where LD is required
- LD instruction placed where STL is required
Troubleshooting Steps
- Step 1: Locate the STL/LD instruction in error
Incorrect instruction placement is identified - Step 2: Swap or correct the instruction per the ladder logic rules
Program compiles without error
How to Reset
To reset: Fix the STL/LD instruction placement, then recompile and download.
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Source: Delta DVP PLC Programming Manual, Delta Electronics
Category: PLC & VFD
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