While the full list contains over 100 entries, these specific codes are commonly reported by users: Error Code (Hex) Description Likely Cause Undervoltage Load supply voltage is below the required 24V threshold. Following Error
The STO (Safe Torque Off) function is triggered. This means power to the motor output stage is safely disconnected, preventing the motor from generating torque. It is a safety feature. Troubleshooting Steps:
Indicates current mode (e.g., P000 for Homing, P1xx for Positioning).
The Festo CMMO-ST-C5-1-DIOP Go to product viewer dialog for this item.
The internal sensor has registered excessive heat in the controller logic or the connected stepper motor. Troubleshooting Steps: cmmo-st-c5-1-diop error codes
Detects when the motor cannot keep up with the commanded path, often due to mechanical blockage.
The controller uses specific code letters (A to G) to define how the motor should behave when a particular error occurs. These responses are parameterizable and determine the stop characteristics and whether the output stage is turned off.
The controller utilizes a to communicate its status and diagnostic messages.
High priority. Interrupts lower-priority messages and to resume operation. Warning Axxx While the full list contains over 100 entries,
Fix : Check load power inputs with a digital multimeter. Verify the circuit stays between under maximum acceleration load. Install an external braking resistor if regenerative voltages spike during decelerations. Logic Power Supply Droop :
Reference the official Festo CMMO-ST Manual for a breakdown of the hex/decimal error code.
: For a full list of over 100 specific codes, refer to the Festo Support Portal and search for the "Description of Functions" or "Hardware Manual" for the CMMO-ST series.
Check safety relay outputs, emergency stop buttons, and target logic voltage. (Modbus / Bus Interruption) It is a safety feature
Interruption of the control connection (e.g., Error 0x47 for Modbus Master communication loss). 🔍 Troubleshooting Steps
CMMO ST EA SY - 2015 06b - 8039016g1 | PDF | Electric Motor
Since this is not a current catalog item from major brands:
The Festo Configuration Tool (FCT) provides detailed history and exact error codes that simple blinking lights cannot show. Reset Errors: Try resetting the error using the input at the DIOP interface or through the software.