: Input signals STO1 and STO2 are mismatched. Both channels must change state within a brief time window. Check emergency stop switches and safety relay wiring.
Issues with the 2-channel safety input signals (STO1/STO2). Troubleshooting & Tools
Internal firmware stack overflow or execution timeout.
While specific codes depend on the firmware version, these are the typical functional areas for errors on the CMMO-ST series: cmmo-st-c5-1-diop error codes
If an error occurs immediately upon power-up, it is likely a Hardware/Wiring issue. If it occurs during movement, it is likely a Parameter/Mechanical issue (e.g., following error). Software Limits:
If you are staring at a blinking LED or a software interface displaying a string of alphanumeric codes, you need to decipher them immediately. This article provides an exhaustive breakdown of , what they mean, their root causes, and step-by-step solutions to bring your system back online.
: Toggle the CCON.RESET bit via your master controller, or click "Acknowledge Error" inside the FCT environment to resume operations. Summary Table: Quick Reference CMMO-ST-C5-1-DIOP/DION - Festo : Input signals STO1 and STO2 are mismatched
: Detection of voltage failure or out-of-range logic supply (Standard:
These codes signify an operating exception within the underlying controller firmware.
: The 24V supply to the controller is too low. Check the power supply unit and wiring for voltage drops. Issues with the 2-channel safety input signals (STO1/STO2)
4 flashes ( Excess position error )
Note: Error codes are often displayed in Hexadecimal format on the web interface or HMI.
: Reach out to the manufacturer's support team. They can provide detailed insights into what the error code signifies and the steps to resolve it.
is a highly specialized, closed-loop stepper motor controller frequently used to drive rotary and linear actuators (like the EMMS-ST series) in precise, multi-axis industrial setups. The "DIOP" variant denotes digital I/O control alongside standard IO-Link/PNP configurations.