Cmmo-st-c5-1-diop Error Codes -

It operates via:

A: Apply a rising edge (0V → 24V) to DIN 3 (Digital Input 3). Alternatively, power cycle the 24V logic supply (not the 48V) for 10 seconds. If the cause is gone, the error will clear. cmmo-st-c5-1-diop error codes

The CMMO-ST-C5-1-DIOP categorizes errors into two severity levels:

All errors are latched. This means that even if the physical cause disappears, the controller remains in an error state until you issue an Error Acknowledge (via a rising edge on the DIN 3 input or via software). It operates via:

If you want, I can adapt this into a short forum post, a troubleshooting flowchart, or include example LED patterns and vendor-specific diagnostic codes—tell me which format.

It looks like you’re trying to make sense of an error code related to a CMMO-ST-C5-1-DIOP — which is a Festo stepper motor controller (part of the CMMO-ST series for stepper motors with integrated I/O and IO-Link). | Error Code | Name | Description |

I’ll break down what that device is, where error codes appear, and how to interpret/resolve them.

Here is the master table of codes you will encounter. Note that when we refer to "blink codes," count the number of short flashes, followed by a long pause.

| Blink Code | FCT Software Message | Root Cause Analysis | Corrective Action | | :--- | :--- | :--- | :--- | | 1 flash | Overcurrent (Power stage) | Short circuit in motor cable; defective motor winding; incorrect motor phase resistance. | 1. Disconnect motor cable. Reset error. If error persists, controller is faulty.
2. If error clears, check cable for shorts (continuity test). | | 2 flashes | Overvoltage | DC link voltage exceeded max threshold (typically > 80V DC for CMMO-ST). Regenerative braking from decelerating a large load too fast. | 1. Increase ramp-down time (deceleration).
2. Ensure power supply is regulated (48V +/- 5%).
3. Install an external braking resistor (if supported by your model). | | 3 flashes | Undervoltage | DC link voltage dropped below minimum operating threshold (approx. 16-18V DC). Underpowered PSU; long, thin power cables causing voltage drop. | 1. Verify power supply outputs 24V (logic) and 48V (power).
2. Measure voltage at the controller terminals under load.
3. Increase wire gauge for power lines. | | 4 flashes | Excess position error (Following error) | The motor’s actual position deviated too far from the target position. Mechanical blocking; acceleration too high; motor undersized. | 1. Manually turn the lead screw/actuator by hand.
2. Reduce acceleration (Fieldbus Acceleration parameter).
3. Increase Position Error Monitoring tolerance (if acceptable). | | 5 flashes | Overtemperature | Internal controller temperature > 85°C. Ambient temp too high; PWM frequency too high; obstructed cooling vents. | 1. Install a cooling fan on the control cabinet.
2. Reduce motor standstill current (Idle current reduction).
3. Move controller to a cooler location. | | 6 flashes | Motor phase failure | One of the two motor phases (A or B) is disconnected. Broken cable; damaged connector pin (M17 or M23). | 1. Visually inspect the stepper motor cable.
2. Use a multimeter: Measure resistance between pins 4 & 5 (Phase A) and 8 & 9 (Phase B). Should be low ohms.
3. Replace cable. | | 7 flashes | Encoder error (Missing encoder) | The feedback encoder (optional on CMMO-ST) is not communicating in closed-loop mode. Wrong encoder type selected in FCT; broken encoder cable. | 1. Check FCT settings: Ensure "Sensorless" is selected if no encoder is present.
2. If using encoder, check 5V supply and A/B track signals. | | 8 flashes | Illegal Hall state | (Less common for stepper) Hall sensors (if used) provide invalid logic combination (e.g., 000 or 111). | 1. Check wiring of Hall sensor interface connector.
2. Replace motor or feedback board. | | 9 flashes | Limit switch error | Both positive and negative limit switches are active simultaneously. Hardware short; incorrectly wired N/O vs N/C switches. | 1. Check DIN inputs for limit 1 and limit 2.
2. Verify logic polarity (Active High vs Active Low) in FCT software. | | 10 flashes | Software overtemperature | The calculated temperature model (based on current and time) exceeds limit, even if actual sensor is cool. High RMS current over long periods. | 1. Reduce duty cycle.
2. Lower the "Motor Peak Current" parameter.
3. Increase pause time between moves. | | Continuous red | Internal device fault (EEPROM/CRC) | Non-volatile memory corruption; firmware crash; severe electrical noise on 24V rail. | 1. Power cycle the entire cabinet (disconnect mains).
2. Reload factory parameters via FCT.
3. Return unit for service. | | Slow blink (1Hz) | Warning: I²t limit reached | The motor is overheating electrically. You are running at peak current for too long. | Reduce acceleration, speed, or load. Allow cooling. The drive will shut down if ignored. | | Fast blink (5Hz) | Start-up error / STO active | Safe Torque Off (STO) function is active (DIN 5 & 6 not receiving 24V). | Apply 24V to both STO inputs (pin 18 & 19). The drive will initialize. |

The CMMO-ST error system is categorized into classes. Understanding the class helps determine the severity.