BECKHOFF CX2100-0014 Power Module Guide

Practical cases of common troubleshooting

Case 1: After the system is powered on, the 24V LED of Us does not light up

Possible reasons: The 24V power supply is not connected, the polarity is reversed, and the spring terminals are not tightened.

Troubleshooting: Measure the voltage between 24V and 0V on the upper row of the power module, which should be 19.2-28.8V. Check the external fuse (2A slow melting is recommended). Confirm that the wire stripping length is 8-9 mm and fully inserted into the circular hole.

Case 2: K-BUS ERR flashes continuously, but the terminals are working properly

Possible reason: EMC interference caused historical errors to not be cleared.

Solution: Disconnect the power supply to Us (unplug the upper 24V line) and wait for 10 seconds before powering it back on. If the error disappears, it is necessary to add grounding or install a power filter inside the control cabinet.

Case 3: After connecting the EtherCAT terminal, the L/A LED stays on but does not flash

Possible reasons: TwinCAT not started or EtherCAT master not configured.

Solution: Scan the device in TwinCAT and confirm that CX2100-0014 is recognized as an EtherCAT coupler. Check if the E-bus terminals are correctly mapped to the process image.

Case 4: LCD displays garbled text or backlight does not light up

Possible reasons: ADS communication abnormalities or incorrect function block parameters.

Solution: Confirm that ADS port 7100 is not occupied. Attempt to directly read and write CoE objects (index 0x8000, etc.) using the "Online" tab of System Manager. If the backlight still does not light up, it may be a hardware failure and the power module needs to be replaced.

Case 5: No response to buttons

Possible reasons: Function blocks are not called correctly or variables are not mapped.

Solution: Add the monitoring variable nSwitchValue to the PLC program and observe whether the value changes when the button is pressed. If there is no change, check if there are any other programs that have overwritten the input mapping. Confirm that the firmware of the power module supports button functionality (all CX2100-0xx4 support it).

Dismantling and Disposal

When it is necessary to replace CX2100-0014, follow the steps below:

Software shutdown: Close TwinCAT Runtime and shut down the operating system normally (if the CPU module is running Windows).

Power off: Cut off the 24V power supply and unplug all wiring (first unplug the Us/UP power cord, then unplug the signal cord). Record the original wiring location.

Dismantling from DIN rail: Use a screwdriver to pry open the bottom latch of the module and pull the orange strap to lift the module upwards and detach it from the rail.

Remove the fixing clip: Use a screwdriver to pry out the upper and lower fixing clips.

Separate module: Pull the power module and CPU module horizontally apart, being careful not to bend the multi pole connector pins.

Disposal: Electronic components must comply with local electronic waste regulations (such as EU WEEE) and must not be mixed with household waste.