Beckhoff CP39xx Control Panel

Beckhoff CP39xx Industrial Control Panel: A Complete Guide from Installation to Remote Transmission and Troubleshooting

In modern industrial automation systems, human-machine interaction terminals need to simultaneously meet high protection levels, flexible installation, long-distance signal transmission, and intuitive multi touch operation. The CP39xx series control panel launched by Beckhoff is designed specifically for this purpose. This series adopts an aluminum alloy shell and a full glass front panel, with an overall protection level of IP65 (dustproof, waterproof), suitable for harsh environments such as mechanical processing, food and beverage, logistics sorting, etc. CP39xx offers various sizes from 7 inches to 24 inches, supports landscape and portrait installation, and is equipped with a projected capacitive multi touch screen (PCT, supporting ten finger touch). According to different remote transmission technologies, CP39xx is divided into two sub versions: -0000 model adopts DVI Extended+USB Extended technology, with a maximum transmission distance of 50 meters; -The 0010 model adopts CP Link 4 technology, with a transmission distance of up to 100 meters, and can simultaneously transmit video, USB, and power through a single cable (One Cable Display Link) through the CU8803 transmission box. This article will provide a comprehensive technical analysis of the CP39xx series from the aspects of hardware structure, interface definition, mechanical installation, remote transmission principle, power and grounding, cable wiring, optional expansion, maintenance and cleaning, and troubleshooting, providing a detailed reference manual for system integration engineers and equipment maintenance personnel.

Product Overview and Model Differences

The CP39xx control panel is an industrial touch display designed by Beckhoff for supporting arm installation systems. It does not have a built-in computer and needs to be connected to an industrial PC or embedded controller through a remote interface. Its main characteristics include:

Display size and resolution (landscape/portrait optional):

7 inches (800 × 480, 5:3)

12 inches (800 × 600, 4:3)

12.1 inches (1280 × 800, 16:10)

15 inches (1024 × 768, 4:3)

15.6 inches (1366 × 768, 16:9)

18.5 inches (1366 × 768, 16:9)

19 inches (1280 × 1024, 5:4)

21.5 inches (1920 × 1080 Full HD, 16:9)

24 inches (1920 × 1080 Full HD, 16:9)

Touch technology: Projection Capacitive (PCT), supports multi finger (up to 10 fingers) operation, can still respond with gloves (suitable non hard particle gloves need to be used).

Shell: Aluminum alloy front panel, surface insulation, full glass coverage, IP65 overall protection.

Remote transmission technology:

CP39xx-0001: DVI Extended+USB Extended, via CU8801 transmitter box, up to 50 meters in length (using CAT5 cable).

CP39xx-0010：CP-Link 4， Based on HDBaseT technology, it can be transmitted through PCIe modules or CU8802/CU8803 transmission boxes, with a maximum length of 100 meters. Among them, CU8803 supports one wire communication (video, USB, 24V power cable).

Optional extensions:

Button extension (C9900-G02x or C9900-G05x): Add 10 or more physical buttons at the bottom of the panel to customize functions.

Toolboard: Used for placing keyboards, mice, or tools, with optional integrated USB interface (IP65).

Handle: Easy to transport.

Interface Explanation and Remote Transmission Technology

2.1 CP39xx-0000（DVI/USB Extended）

This model provides three interfaces on the connection block at the rear of the device (accessible by opening the cover when located inside the support arm adapter):

Power interface (X101): 4-pin M12 female socket, dual 24V/dual GND (redundant connection). The maximum load capacity of the plug is 16A, and it is recommended to use a 4 × 0.75 mm ² cable.

DVI Extended Input (X102): Dedicated digital video input, can travel up to 50 meters. The panel has a built-in signal recovery processor that can correct signal distortion after long-distance transmission. The PC end needs to be equipped with a CU8801 transmitter box (to convert DVI to DVI Extended signal).

USB Extended Input (X103): Used to connect the CU8801 transmitter box and achieve USB signal transmission up to 50 meters in length (non Ethernet, not accessible through switches). USB 2.0 speed (100 Mbit/s).

2.2 CP39xx-0010（CP-Link 4）

Power interface (X101): Same as -0000, but additional power supply is prohibited when using CU8803 transmitter box (see below for details).

CP Link 4-Input (X102): 8-pin M12 female socket, using HDBaseT technology, a single CAT5e/6 cable can simultaneously transmit DVI/DisplayPort, USB 2.0, and (optional) power, with a maximum length of 100 meters.

Connection scheme:

Direct connection: Install CP Link 4 PCIe modules (such as C9900-E...) on industrial PCs and connect them directly to the panel via CP Link 4 cables. At this time, the panel needs to be powered separately (Two Cable Display Link).

Through CU8802 transmission box: Connect CU8802 (DVI or DisplayPort+USB) to PC, and then connect the transmission box to the panel through CP Link 4 cable. The panel requires separate power supply (two cables).

Through the CU8803 transmission box (recommended): Connect the CU8803 to a PC, and the transmission box simultaneously transmits video, USB, and 24V power to the panel via CP Link 4 cable (One Cable Display Link). At this time, it is not allowed to connect the independent power interface of the panel again, otherwise dual power supply will damage the equipment.

The CU8803 transmission box requires an external 24V power supply, and its power consumption calculation needs to consider panel power consumption (refer to technical data).

Mechanical installation and support arm adapter

3.1 Direct Installation and Adapter Selection

The rear shell of CP39xx has four M6 threaded holes, which can be directly installed onto third-party support arm systems. Beckhoff offers a variety of optional support arm adapters (pre installed or self installed) to adapt to Rittal or Rolec's 48 mm pipe diameter systems. The adapter can achieve ± 20 ° pitch and ± 165 ° rotation.

Ordering options (factory pre installed):

C9900-M750: Adapter facing upwards (cable introduced from below)

C9900-M751: Adapter facing downwards (cable introduced from above)

C9900-M752/M753: Version with button extension

Self installed adapter:

C9900-M761/M763: Requires adapter board C9900-M362 (for -0000) or C9900-M338 (for -0010)

3.2 Key points of installation steps

Open the adapter cover: Use a flat head screwdriver to pry open the bottom buckle, slide the cover upwards to expose the interface.

Install support arm tube:

Thread the connecting cable through the support arm tube.

Insert the support arm tube into the adapter to the stop position (50.2 mm deep).

Use a 3mm hex wrench to tighten the hex screw (torque 3 Nm).

Tighten the groove nut clockwise with a 58-62 hook wrench (torque 20 Nm).

Tilt and Rotation: The adapter allows the panel to tilt ± 20 ° and rotate ± 165 °, making it easy to adjust the optimal viewing angle.

3.3 Button Expansion and Cable Channels

If a button extension (C9900-G02x or G05x) is ordered, there will be a cable channel between the panel and the adapter. The channel cover (4 TX10 screws) and button expansion cover (7 TX10 screws) need to be opened before wiring can be done. For G02x model, the cable is introduced through M20 gland head; For G05x, use a 19 pin circular connector (Beckhoff provides prefabricated cables).

Power connection and grounding requirements

4.1 Power specifications

Rated voltage: 24 V DC (allowable range 22-30 V)

Plug: 4-pin M12, dual 24V/dual GND (parallel use can reduce contact resistance)

Wire cross-section: 4 × 0.75 mm ² (recommended for long-distance use)

Example of Voltage Drop Calculation (CP3924-0000):

Power consumption of 34 W, current of 1.5 A at 22 V

10 meter dual core 0.75 mm ² cable (back and forth 20 meters), copper resistivity 0.0178 Ω· mm ²/m → line resistance 0.475 Ω

Voltage drop=1.5 A × 0.475 Ω=0.71 V

The voltage at the power plug should be ≥ 22 V, therefore the output voltage of the power supply should be at least 22.7 V.

CP39xx-0010 with CP Link 4 has slightly higher power consumption (such as about 40 W for CP3924-0010), which needs to be calculated accordingly.

UL requirement: The power supply must comply with NEC Class 2 or be protected by a maximum 4A fuse (UL 248).

4.2 Protective Grounding and Functional Grounding

Protective Grounding (PE): The PE terminal inside the connection block or adapter must be connected to the central grounding point of the control cabinet using at least 4 mm ² wire to prevent dangerous contact voltage.

Functional grounding (FE): achieved through the same PE terminal, is the key to ensuring electromagnetic compatibility (EMC). Failure to perform functional grounding may result in touch screen misoperation, communication interference, and other malfunctions. The equipment meets EN 61000-6-2 (immunity) and EN 61000-6-4 (radiation) requirements.

Important: When using the CU8803 launch box, it is forbidden to supply power to the independent power interface of the panel, otherwise dual power supply will damage the equipment.

Cable Routing Guide

5.1 Adapter internal wiring (to prevent rotation damage)

The support arm adapter is equipped with a stress relief plate (with cable tie holes) inside. Wiring must be done in the specified order to avoid cables being pinched when the panel rotates/tilts:

For CP39xx-0000:

The power cable (thicker) runs on the outer side (right side), and the data cable (DVI Extended+USB Extended) runs on the inner side (left side).

Secure the power cable with zip ties to the two holes on the far right side of the stress relief plate.

Fix the two data cables together with zip ties in the leftmost hole of the stress relief board (using the first and third holes on the left).

For CP39xx-0010:

All cables (CP Link 4 cable, may have an additional independent power cord, but when using CU8803, there is only one CP Link 4 cable) are routed on the inner side.

When using a single cable, fix it with zip ties at the two leftmost holes; When two cables are used, fix them together with zip ties at the leftmost and third hole positions.

5.2 Additional stress relief plate (only -0000)

-The 0000 model power cable also needs to pass through an additional stress relief plate (located near the back of the panel). Thread the cable under the board and secure it to the board with zip ties.

Optional extensions: buttons, toolboards, and handles

6.1 Button Expansion (C9900-G02x/G05x)

G02x: The cable is introduced through an M20 gland and requires the user to wire it themselves (using the wiring diagram provided by Beckhoff).

G05x: Using a 19 pin circular connector, Beckhoff provides prefabricated cables that only need to be plugged in.

The function of key extension can be mapped to custom shortcut keys (such as screen switching, emergency stop confirmation, numerical input, etc.) through upper computer software (such as TwinCAT).

6.2 Tool board and handle

Tool board (C9900-M406/M423/M419): Installed at the bottom of the panel, used to place keyboards, mice, or tools. Some models integrate IP65 USB-A sockets (1 or 2) on the rear side.

Handle (C9900-M361): 386mm long, aluminum anodized, easy to handle large panels.

Maintenance and Cleaning

7.1 Touch screen cleaning mode

To prevent accidental contact during cleaning, the "Cleaning Mode" must be enabled using the Beckhoff Display Control Tool:

Run the tool (the sun icon appears on the taskbar).

Right click on the sun icon and select 'Cleaning Mode'.

Set the cleaning duration (5-120 seconds).

During this period, touch screen input is disabled and can be wiped with a soft cloth and glass cleaner.

Attention: Not only should the display area be cleaned, but also the edges of the glass should be cleaned. Contaminants at the edges (such as liquid films) may form conductive bridges, leading to continuous triggering of misoperations at the screen edges.

7.2 Cleaning agents and tools

Permitted: Benzine spirit, glass cleaner, soft damp cloth, vacuum cleaner (only for housing ventilation slots).

Prohibited: Cleaning agents containing abrasives, metal scrapers (razor blades, steel shovels), steam jets, high-pressure water guns, compressed air (which may blow dust into the interior).

7.3 Faulty pixels

Individual pixel defects in TFT display screens are due to production process reasons and are not within the scope of warranty.

Common troubleshooting

Possible causes and solutions for the fault phenomenon

The panel shows no display of power loss, cable breakage, or poor plug contact. Check the power supply voltage (22-30V) and measure the M12 plug pin; Check the fuse; Check if CU8803 is powered (if used)

Screen is dark or completely black (power LED is on), backlight is damaged, internal components of the panel malfunction, contact Beckhoff service

The touch screen has no response or jumping function, and the grounding is missing or poor

User not properly grounded (static electricity)

Glass edge contamination inspection PE connection (≥ 4 mm ²)

The operator should wear regular shoes and stand on the ground

Clean the edges of the screen

TwinCAT access error via USB. The default cycle time of 10 ms is too short. The TwinCAT cycle time has been increased to 50-80 ms

CP Link 4 connection unstable cable with excessive length (>100 m), poor quality, and small bending radius. Use CAT5e/CAT6 shielded cable with a length ≤ 100 m to avoid sharp angle bending

When using CU8803, if the panel is not powered and the transmission box is not powered or the CP Link 4 cable is damaged, check the 24V input of CU8803; Replace the cable; Confirm that the independent power supply of the panel is not connected at the same time

If the above steps are invalid, record the device model and serial number (BTN), and contact Beckhoff service（ service@beckhoff.com ）.

Summary of Technical Specifications

Project CP39xx-0000 CP39xx-0010

Remote transmission technology DVI Extended+USB Extended CP Link 4 (HDBaseT)

Maximum distance 50 m 100 m

Video interface DVI Extended (dedicated) CP Link 4 (8-pin M12)

USB Transfer USB Extended (Non Ethernet) USB 2.0 over CP Link 4

First line power supply is not supported (using CU8803 transmitter box)

Weight (7 "~24") 1.8 kg~7.6 kg (with connecting block) Same as left (adapter weighs about 0.8-1.2 kg)

Power supply 24 V DC, 22-30 V, NEC Class 2 on the same left (no independent power supply required for CU8803)

Power consumption of 7 inches is about 15 W, and 24 inches is slightly higher at about 34 W (about 40 W corresponds to 24 inches)

Working temperature: 0~+55 ° C, same as left

Protection level IP65 (overall) IP65

Anti vibration/anti impact EN 60068-2-6/2-27 Same as left

EMC EN 61000-6-2/6-6-4 Same as left

Certified CE, FCC Class A on the same left