BECKHOFF CX2100-0014 Power Module Guide

BECKHOFF CX2100-0014 Power Module Full Integration and Diagnostic Guide

Module positioning and system value

In the Beckhoff CX2000 series embedded PC system, the power module is not only the power supply unit, but also the status display and diagnostic center of the entire control platform. CX2100-0014, as the passive ventilation version in this series, is designed specifically for high-performance multi-core embedded PCs such as CX2020, CX2030, CX2040, etc. It provides 24 V DC power supply, K-bus/E-bus automatic recognition, 2 × 16 character LCD display, navigation buttons, and comprehensive I/O terminal power management. For engineers who are migrating from outdated controllers (such as Woodward, Honeywell, and other discontinued modules) to PC based controls, understanding the installation, wiring, display programming, and fault diagnosis process of CX2100-0014 is a crucial step in ensuring reliable system operation.

This article is based on the hardware manual of CX2100-0014 power module, combined with common requirements on the engineering site, providing a complete set of engineering deployment and troubleshooting guidelines from mechanical installation, power wiring, LCD display control, button operation, K-bus/E-bus diagnosis, passive EtherCAT terminal processing, and other aspects.

Product Overview and Technical Specifications

1.1 Hardware Architecture

CX2100-0014 is a DIN rail mounted power module with external dimensions of 60 mm (width) x 100 mm (height) x 91 mm (depth), weighing approximately 550 g. Its housing adopts IP20 protection level and is suitable for installation in control cabinets. The right side of the module integrates power terminal blocks and bus interfaces (K-bus or E-bus), supporting direct connection to Beckhoff bus terminals or EtherCAT terminals. The left side is connected to the CX20x0 basic CPU module through a multipole connector, providing power to the entire system.

The main technical parameters are as follows:

Input voltage: 24 V DC (-15%/+20%), which allows for 19.2~28.8 V

Maximum output power: 130 W

Maximum power consumption: 3.5 W (self), E-bus/K-bus power supply maximum 10 W (5 V/2 A)

Terminal power supply capability: maximum 10 A through power contacts, maximum 2 A through I/O terminals

K-bus process data: maximum 2048 byte input+2048 byte output, supports up to 64 terminals (up to 255 through expansion)

E-bus: Supports up to 65534 EtherCAT terminals

Working temperature: -25 ° C~+60 ° C

Storage temperature: -40 ° C~+85 ° C

Relative humidity: 95%, no condensation

Certification: CE, UL

1.2 Differences from other power modules

The CX2100 series has four types of power modules:

CX2100-0004: Standard version, automatic switching between K-bus/E-bus

CX2100-0014: Passive ventilation version (protagonist of this article), with additional heat dissipation openings added

CX2100-0904: Integrated Capacitive UPS

CX2100-0914: Integrated external battery charging unit, supporting UPS function

CX2100-0014 is suitable for scenarios where the total load does not exceed 45 W (such as USB devices or CX25xx modules), and the installation location must meet ventilation requirements. For CX2020/CX2030 with active fan cooling, vertical installation is also allowed.

Mechanical installation and location requirements

2.1 Installation steps

Connect CPU module: Align the multipole connector on the right side of CX2100-0014 with the interface on the left side of the CX20x0 basic CPU module, and push horizontally until the two module housings are flush without gaps.

Install bar clips: To prevent the module from loosening due to vibration, insert the accompanying metal clips between the upper and lower heat dissipation fins. Push the clip in until it does not protrude and is level with the fins.

Hanging DIN rails: Use TS35/7.5 or TS35/15 rails that comply with DIN EN 60715. First, pry open the lock buckle at the bottom of the module (using a screwdriver to pry outward), hang the module onto the guide rail from the front, press down until you hear a "click" sound to lock it, and then reset the lock buckle.

2.2 Installation position and ventilation distance

CX2100-0014 must maintain at least 30mm of free space above and below the connected embedded PC to ensure air convection. The installation direction depends on the CPU model:

Embedded PC model, horizontal installation, vertical installation, working temperature range

CX2020 does not allow -25~+60 ° C

CX2030 does not allow -25~+60 ° C

CX2040 does not allow -25~+60 ° C

CX2020 with fan allows -25~+60 ° C

CX2030 with fan allows -25~+60 ° C

CX20x2 multi-core allows -25~+50 ° C

Important: When installing vertically, an additional fixing bracket must be installed below the embedded PC to prevent it from slipping off the DIN rail. At the same time, the connected bus terminals must also allow for vertical installation.

2.3 Passive EtherCAT Terminal Installation Taboos

The manual emphasizes that passive EtherCAT terminals (such as EL9195) should not be directly installed on the right side of the power module. Passive terminals refer to terminals that do not participate in active data exchange, have no process mapping, and do not consume E-bus current. If it is installed tightly against the power module, it will weaken the E-bus signal quality. The correct approach is to insert at least one active terminal (a conventional terminal that consumes E-bus current, such as a digital input module) between the power module and the passive terminal. Identification method: In the TwinCAT tree structure, the passive terminal does not display process data, and the value in the "E-bus (mA)" column is the same as the previous terminal.

Power wiring and UL requirements

3.1 Definition of Wiring Terminals

The right power terminal block of CX2100-0014 adopts a spring crimping type and is divided into two groups:

Upper row (Us): marked with "24 V" and "0 V", providing power to the CPU module and bus (K-bus/E-bus). This is the core power supply of the entire system.

Bottom row (Up): Three terminals marked with "+" (actually+24 V, 0 V, ±? Table 3 in the manual shows: power contact number 9 "+24 V", power contact number 10 "0 V", and spring terminal number 12- actually used to supply power to the bus terminal's power contact, electrically isolated from Us.

Wiring specifications: The cross-sectional area of the wire is 0.5~2.5 mm ² (AWG 20~14), and the stripping length is 8~9 mm. Insert a straight screwdriver into the square hole, press down the spring, insert the wire into the circular hole, and pull out the screwdriver to lock it.

3.2 Power Supply Logic and Voltage Requirements

Us and Up can come from the same 24V power supply or be supplied separately, but they must be grounded together (connected to the same potential at 0V). According to EN 60204-1:2006 PELV requirements, the 0 V end of the power supply must be connected to the protective conductor system (grounding bar inside the control cabinet).

After power on, two green LEDs should light up:

Us 24V LED: CPU and bus power supply are normal

Up 24V LED: Power contact supply is normal

If any LED does not light up, check the corresponding circuit voltage (at least 22V is required, as a -15% drop is allowed).

3.3 UL Compliance Precautions

For UL certified environments (see UL mark on module nameplate), the following must be met:

The power supply voltage source is isolated 24 V DC with a maximum of 4 A fuse (compliant with UL248 standard), or the power supply is NEC Class 2.

Do not use two NEC Class 2 power supplies in series or parallel.

K-bus diagnosis and detailed explanation of fault codes

When CX2100-0014 is connected to traditional bus terminals (KL series), it operates in K-bus mode. The diagnostic LED "K-BUS RUN" is always green, indicating normal operation; The red flashing of "K-BUS ERR" indicates an error. Flashing mode rules:

Quick flashing: Error sequence begins

First slow sequence (number of pulses): Error code

Temporarily extinguished

Second slow sequence (number of pulses): incorrect parameter (usually indicating the location of the faulty terminal)

Common Error Code Table

Error code (pulse count), error parameter meaning, handling measures

Continuous flashing (no code) - EMC interference check for power spikes, improve grounding, add filters; Re powering on may locate the fault

30 K-bus command error: bus terminal not inserted or damaged; Using binary method to remove terminals one by one and search for fault points

Check if the first terminal is properly plugged in when the data is disconnected (immediately after the power module); Is there a KL9010 terminal at the end

4 n (>0) Check if the (n+1) th terminal is reliably connected after the nth terminal is disconnected

5. Communication error with the nth terminal register. Replace the nth terminal

6 0 initialization error, replace embedded PC

6 1 or 8 internal data error hardware reset (power off and power on again)

7 0 Process Data Length Mismatch Check if TwinCAT Configuration is Consistent with Actual Terminals

Important: Even if the root cause of certain errors has been eliminated, the K-BUS ERR will continue to flash. At this time, the 24V power supply to the power module must be disconnected (only the Us) and then powered back on to clear the flashing.

Diagnosing K-bus status through PLC program

In TwinCAT, the State variable (address IB2, byte type) of the bus coupler provides more diagnostic information. The meanings of this variable are:

Bit meaning

0 K-bus error

1. Terminal configuration changes after self startup

2 Process image length mismatch

8 No valid input

9 K-bus input update incomplete

10 K-bus output update incomplete

11 watchdog error

15 Asynchronous K-bus function activation (such as reset)

If a K-bus error (State<>0) is detected, the IOF_DeviceReset function block (from the TcIoFunctions library) can be called to attempt to reset the bus. It is recommended to check State. 0 after each startup or hot reset, and if it is 1, trigger a rescan configuration.

E-bus diagnosis and LED indication

When connecting the EtherCAT terminal (EL series), the module automatically switches to E-bus mode. Diagnostic LED meaning:

Us 24V: Green constant light=CPU and bus power supply are normal

Up 24V: Green constant light=Power supply contacts are supplying power normally

L/A: Off=E-bus not connected; Always on=Connected but without data; Flashing=Data transmission and reception in progress

There is no dedicated "ERR" LED in E-bus mode, and error messages are displayed through TwinCAT's CoE (CAN over EtherCAT) directory or state machine status. If the E-bus communication is interrupted, first check the physical connection (the E-bus is transmitted through the contacts on the terminal side without the need for external cables), and confirm that all terminals are correctly locked and not exceeding the maximum number (65534).

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.