Overview
This article outlines the process to resolve a common Programmable Logic Controller (PLC) error that may occur when attempting to upload a program to the PLC. This error might arise when certain restrictions or configurations prevent the successful upload of the PLC program.
Problem Description
When writing or uploading a program to a PLC, certain settings or configurations may prevent the successful transfer of the program. This could be due to specific checkboxes or options being selected that restrict program upload or other underlying settings in the PLC software.
Common Causes
Restrictive Settings: Options that prevent or restrict program uploads.
Firmware or Software Mismatch: Incompatibility between the PLC software version and the device firmware.
Network Issues: Communication issues between the PLC and the connected system.
General Solution
Step 1: Confirm Versions and Settings
Check the software version and firmware version of the PLC.
Confirm network configurations and connectivity.
Review any specific settings that might restrict program uploads.
Step 2: Clear Restrictive Settings or Reset PLC
Locate any checkboxes or options that might be restricting program uploads and clear or deselect them.
If necessary, consult Chapter 10 of the specific PLC user manual to find instructions for resetting or clearing the PLC to default settings.
Follow the instructions carefully, as this may erase existing configurations and programs.
Step 3: Write or Upload the Program Again
Attempt to write or upload the program to the PLC again.
If needed, create a new program or contact the original programmer for support.