Illuminated or flashing indicates a system fault, such as an analog input over-range, memory corruption, or hardware mismatch. Common Fault Codes and Solutions Fault Description Potential Cause Corrective Action No Display / No LEDs Blown fuse or loose power connection.
If you see a website charging for this manual, it is a scam. Most industrial automation documentation is free under EULA terms. M91-t4-r6-zk1 Manual