Beckhoff CP69xx long-distance transmission and installation

Beckhoff CP69xx Built in Control Panel: DVI/USB Extended Long Distance Transmission and Cabinet Installation Guide

In modern industrial automation systems, operator panels often need to be deployed on on-site control cabinets tens of meters away from the host. Traditional DVI and USB transmission distances are limited (usually not exceeding 5 meters), making it difficult to meet the layout requirements of large production lines. The Beckhoff CP69xx series built-in control panel is designed to address this pain point, with its core advantage being support for DVI Extended and USB Extended long-distance transmission technologies, extending video and touch signals up to 50 meters through standard cables. This article will be based on the CP69xx series technical manual, providing in-depth analysis of the panel's long-distance signal transmission architecture, rapid installation process of cabinets, power wiring specifications, definition of status indicator lights, and systematic troubleshooting process, providing on-site engineers with a full stack technical reference from deployment to maintenance.

Chapter 1: Product Positioning and Long Range Transmission Technology

1.1 Overview of Applicable Scenarios and Selection

The CP69xx series is a built-in single touch control panel designed specifically for installation on control cabinet doors or console panels. The front panel protection level reaches IP65 (dustproof and anti spray water), and the rear protection level is IP20. This series offers a variety of display sizes and resolution options from 5.7 inches to 19 inches (including 4:3 and 5:4 ratios), and different front-end laminates can be selected according to requirements:

Pure display (no buttons)

Equipped with function keys (including 10 PLC special keys with LED)

Equipped with a digital PC keyboard (US layout, including 10 PLC special keys with LED)

PC keyboard with alphanumeric (US layout, including 10 PLC special keys with LED)

It is strictly prohibited to use the equipment in areas with explosive hazards.

1.2 DVI Extended Long Distance Video Transmission

The CP69xx is equipped with a DVI Extended input interface (X101), which supports transmitting DVI video signals from industrial PCs up to a maximum distance of 50 meters.

Technical principle: Standard DVI signals will experience severe distortion during long-distance transmission (>10 meters). CP69xx integrates a signal processor internally, which can fully regenerate and restore attenuated and distorted DVI signals at the receiving end, ensuring image quality during long-distance transmission. The industrial PC only needs to have a standard DVI output interface.

Key engineering constraint: When the transmission distance is large, the data transmission rate of DDC (Display Data Channel) files must be limited to 50kHz or below. The DDC file is used to inform the properties of the PC monitor, such as timing and resolution. If the value is too high, it may cause no image display during the startup process, or the screen may not appear until after Windows starts. Engineers need to confirm and adjust this parameter in the VideoBIOS or Windows graphics card driver of the graphics card.

1.3 USB Extended Long Distance Touch Transmission

The CP69xx is equipped with a USB Extended input interface (X102) in the form of an RJ45 socket, which is used in conjunction with the CU8801 USB to USB Extended conversion box. It can extend USB 2.0 (480 Mbit/s) signals to the control panel through a 50 meter CAT-5 network cable.

Important clarification: This is USB Extended proprietary technology, not standard Ethernet. No Ethernet switches or hubs shall be connected in series in the middle of the cable. The CU8801 conversion box needs to be installed on the DIN rail on the industrial PC side, and the extended signal will be converted back to standard USB inside the panel.

Interface comparison:

X103 (USB input): Standard B-type socket, used for short distance direct connection up to 5 meters.

X102 (USB Extended Input): RJ45 socket, used for long-distance transmission up to 50 meters (requires CU8801).

X104, X105 (USB output): Standard A-type socket used to connect peripheral devices such as keyboards, mice, USB drives, etc.

Chapter 2: Mechanical Installation and Cabinet Drilling Process

2.1 Hole preparation and size acquisition

The installation dimensions of CP69xx need to be obtained through the "Technical Drawing Download" on the Beckhoff official website. When preparing to open holes in the control cabinet, it is important to pay attention to the following points:

Wall thickness requirement: The installation wall thickness should be between 2mm and 5mm.

Installation direction: The device is only allowed to be installed vertically to ensure internal air convection and heat dissipation.

Environmental factors: The installation location should avoid direct light sources from reflecting on the screen and prevent direct sunlight from shining on the equipment.

2.2 Installation process of quick locking mechanism

CP69xx adopts a pull out clamping lever fixing method without loose parts, which does not require additional screws and significantly improves the installation efficiency inside the cabinet.

Operation steps:

Insertion: Insert the control panel into the cut cabinet door opening from the front and ensure that the equipment does not fall off before fastening.

Unfold: Flip the clamping levers on both sides outward by 90 ° to the unfolded state (as shown in sections A and B of the figure).

Locking: Use a 3.0mm hex wrench to tighten the screw on the clamping lever (as shown in section C of the figure) until the panel is firmly attached to the cabinet door.

Attention: After installation, it is necessary to check the sealing between the control panel and the installation wall to ensure the effectiveness of the IP65 protection level.

Chapter 3: Electrical Connection and Grounding Standards

3.1 Definition of Power Interface and Voltage Drop Management

CP69xx introduces a 24 VDC main power supply through a 5-pin voltage socket (X106), and its core power supply pin is defined as:

Pin 4:24V negative pole (-)

Pin 5:24V positive pole (+)

Pin 3: Protective Grounding (PE, used for protective grounding)

Pin 1, Pin 2: Not used (NC)

Power requirements: Rated input voltage of 24 VDC, allowable fluctuation range of 22-30 VDC. The power supply must be NEC Class 2 isolated power supply and equipped with a maximum 4A fuse according to UL 248 standard.

To ensure the stability of long-distance power supply, cables with a cross-sectional area of 1.5 mm ² should be used for longer power lines to reduce voltage drop. The voltage at the device power plug should be maintained at least 22V to withstand unexpected restarts or undervoltage shutdowns caused by grid fluctuations.

3.2 Assembly of power plug and stress relief housing

The power plug (C9900-P927) of CP69xx adopts a unique structure of 5-pin connecting strip and stress relief shell (with zip ties). Engineers need to assemble themselves according to the following steps:

Plug installation:

Peel off the outer layer of the cable by a few centimeters and remove the insulation layer (8-9mm) at the end of the wire core.

Crimp connection terminals (Ferrules) at the end of the online core.

Insert the wire core into the 5-pin connector strip according to the pin definition and tighten the screw.

Stress relief shell installation (see manual figure 13):

Thread the zip tie into the lower half of the stress relief shell.

Insert the assembled connecting strip into the lower half.

Tighten the zip ties and cut off excess plastic sheets.

Close the upper part to the lower part and hear a "click" sound to complete.

Disassembly method: Use your fingers to gently break off half of the lock buckle, pry open the upper half, and cut off the zip tie.

3.3 Separation and Implementation of Protective Grounding (PE) and Functional Grounding (FE)

The CP69xx manual clearly distinguishes the concepts of protective grounding and functional grounding:

Protective Grounding (PE): According to EN 60204-1 standard, low resistance protective grounding is achieved through Pin 3 of the voltage socket to prevent dangerous touch voltage.

Functional grounding (FE): In order to meet EMC immunity (EN 61000-6-2) and emission limits (EN 61000-6-4), functional grounding must be achieved through the grounding bolts inside the rear shell connection compartment. The manual emphasizes that the functional grounding wire should use a wire or flat conductor with a cross-sectional area of at least 4 mm ², and the circumference of the conductor should be as large as possible (i.e. using multi stranded wire is more effective) to provide a low impedance discharge channel for high-frequency interference.

Attention: One of the common causes of touch screen misoperation is poor functional grounding. If the touch function is abnormal, first check whether the grounding bolt is reliably connected to the central grounding point of the control cabinet.

Chapter 4: Interpretation of Status LEDs

The rear connecting cabin of CP69xx is equipped with six status indicator lights, which facilitate engineers to quickly diagnose the equipment status:

Meaning of LED identification

1. No functional reservation, no definition

2. No functional reservation, no definition

3 USB 1 USB 1 interface is working

4 USB 2 USB 2 interfaces are working

5 Power Good Input voltage is normal (OK)

6 24 V in 24V power supply has been established

Engineering application: If there is no display or touch failure on the panel, the rear LED status can be observed. If both "Power Good" and "24 V in" do not light up, the problem is concentrated on the power supply end; If it is on but not displayed, the video signal link needs to be checked.

Chapter 5: Operating Standards and Cleaning Maintenance

5.1 Restrictions on operating media

To ensure the long-term reliability of the touch screen:

Touch screen: Only fingertips or specialized touch screen pens are allowed. If the operator wears gloves, it is necessary to ensure that the surface of the gloves is free of hard particles such as metal shavings and glass shards, otherwise it will seriously scratch the screen surface.

5.2 Cleaning Mode

CP69xx supports activating the "cleaning mode" through the Beckhoff Control Tool to prevent accidental touch actions during the cleaning process.

Launch Beckhoff Control Tool (with the sun icon appearing on the taskbar).

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

The duration of the cleaning mode can be configured between 5 and 120 seconds (set through the "Options" menu).

5.3 Protective Film Bonding

If short-term dust and scratch prevention is required, Beckhoff protective film can be applied. Operation points:

Operate in a dust-free environment as much as possible.

Thoroughly clean the screen surface and remove any remaining grease.

Peel off the protective film from the bottom paper on the short side and attach it to the surface.

Use a scraper (or a tool with soft rubber/felt edges) to gradually advance and squeeze out the bubbles.

Be extra careful when removing the protective film to avoid damaging the touch sensitive film located between the glass panel and the protective film - it should be slowly removed from a corner at the flattest possible angle.

Chapter 6: Selection Guide for Connection Kits

CP69xx offers a variety of pre installed connection kits to simplify project selection:

Package model length includes content

C9900-K560 1m DVI cable 1m+USB cable 1m

C9900-K513 3m DVI cable+3m USB cable

C9900-K515 5m DVI cable 5m+USB cable 5m

C9900-K625 10m DVI cable 10m+CAT-5 cable 10m+CU8801 conversion box+1m USB connection cable

C9900-K626 20m DVI cable 20m+CAT-5 cable 20m+CU8801 conversion box+1m USB connection cable

C9900-K627 30m DVI cable 30m+CAT-5 cable 30m+CU8801 conversion box+1m USB connection cable

C9900-K628 40m DVI cable 40m+CAT-5 cable 40m+CU8801 conversion box+1m USB connection cable

C9900-K629 50m DVI cable 50m+CAT-5 cable 50m+CU8801 conversion box+1m USB connection cable

C9900-K777 1m DisplayPort to DVI cable 1m+USB cable 1m

C9900-K778 3m DisplayPort to DVI cable+3m USB cable

C9900-K779 5m DisplayPort to DVI cable 5m+USB cable 5m

Selection suggestion: When the distance is ≤ 5 meters, choose the standard DVI+USB kit; When the distance is greater than 5 meters to 50 meters, the USB Extended kit (C9900-K625 to K629) with CU8801 conversion box must be selected.

Chapter 7: Quick Troubleshooting Checklist

Possible causes of malfunction and corresponding measures

The control panel is completely non functional and the power supply is not connected/internal fault check X106 voltage (Pin 4/5), confirm that the voltage is in the range of 22-30V; Observe the status of the rear LED "Power Good" and "24V in"; If it is invalid, contact Beckhoff Service.

The screen is extremely dark or completely black (power indicator is normal), and the backlight of the display screen is aging or damaged/internal component failure requires contact with Beckhoff Service for repair or replacement.

Complete failure or occasional misoperation of touch function grounding (FE) is poor or missing/the operator has not effectively grounded. 1. Check whether the grounding bolt of the rear shell is reliably connected to the grounding point of the control cabinet (≥ 4mm ²).

2. Ensure that the operator is wearing normal shoes and standing on the ground (human body grounded).

There is no image during the startup process. After entering Windows, the DDC file transfer rate is displayed as too high. Check the DDC transfer rate in the VideoBIOS or Windows graphics card driver to ensure that its value is ≤ 50kHz.

Communication error occurs when connecting TwinCAT via USB. The TwinCAT cycle period is set too short (default 10ms). Increase the TwinCAT cycle period to between 50ms and 80ms.

Remote (>5m) touch unresponsive without using USB Extended solution/CAT-5 cable connected in series with a switch. Confirm the use of CU8801 conversion box and ensure that the USB Extended cable is directly connected without any intermediate nodes.