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Data + Power = Simplify, Single cable solution in industrial vision application

Neil Chen,
Product Manager, ADLINK Technology

All industrial vision appliances require both image data and a power supply, and most of the industrial cameras require two cables-one for image data transmission and the other for power. Two cables mean double the installing and maintaining wiring cost, and two times the opportunity for failure.

 

In the early years, analog cameras almost dominated the industrial vision market; however one of the shortcomings associated with analog cameras is electromagnetic interference, or EMI. Although analog cameras use a shielded coaxial cable for signal transport, EMI can still adversely affect the 1 volt, peak-to-peak video signal contained within it. Thus, the combination of power, and image data into a single cable was not the mainstream. Technological advances such at the introduction of digital camera standards that use Camera Link, FireWire, and Gigabit Ethernet eliminate this issue as data transmission in digital camera exists in only two voltage states, and therefore is not as susceptible to EMI as analog is. After the move from analog to digital cameras, the focus in the industrial vision market became simplifying installations, reducing space, and reducing costs.

Feeding the Demand

 

Enhancing the digital camera standard with the combination of the data line and power line into a single cable is a common means for feeding the demand.

Power over Camera Link (PoCL)

 

Camera Link was developed as an open specification for cameras and frame grabber cards for use in machine vision applications. The Camera Link interface specification was defined in the year 2000 by the Automate Imaging Association, an industry group consisting of industrial camera, cable, and frame grabber card manufacturers. Camera Link utilizes low voltage differential signaling (LVDS) technology to transmit digital data.

 

PoCL is a recent addition to the Camera Link specification, and it provides a single cable solution for the Camera Link digital interface and power to a camera. This is accomplished without losing backward compatibility to the present Camera Link standard. A "SafePower" mode in the PoCL standard was designed to reduce accidental connections of non-compatible products that may result in damage to cameras and/or frame grabber cards. SafePower compatibility is accomplished by incorporating a camera sensing circuit on the frame grabber that will only supply power after determining whether the connected camera is PoCL compatible.

 

PoCL systems and devices are required to maintain standard Camera Link data and control interfaces and each PoCL device has additional functions standard to Camera Link as described below.

 
  • PoCL Cable: A Camera Link cable having power supply lines
  • PoCL Frame Grabber: A Camera Link frame grabber with power supply capability
  • PoCL Camera: A Camera Link camera that accepts power supplied through the Camera Link connector
 

In order to maintain backward compatibility, PoCL cables use the same connector and cable structure as standard Camera Link cables. Table 1 describes the difference between PoCL cables and normal Camera Link cables. Wires connected to pins 1 and 26 are insulated and used as +12 V power lines. Wires connected to pins 13 and 14 are the same drain wire and used as return and power lines.

Table 1. PoCL and Camera Link cable pin definition

IEEE 1394 (FireWire)
The IEEE 1394 (registered as the FireWire trademark by Apple, Inc.) interface is a serial bus interface standard for high-speed communications and isochronous real-time data transfers that supplies a maximum of 45 W of power. Today, IEEE 1394, along with its associated IIDC(DCAM) protocol specification developed by the 1394 Trade Association, is also widely deployed choice for industrial vision applications, the IEEE 1394b is an excellent interface for industrial vision applications offering reliable data transfer, minimal CPU loading, and single cabling. Figure 1 shows the pin definition of the 9 pin IEEE 1394b connector. VG and VP are the power pins for power transmission.

Figure 1. Pin definition of the 9 pin IEEE 1394b connector

Power over Ethernet (PoE)
Gigabit Ethernet cameras can communicate with computers via existing Ethernet technologies for industrial vision applications. PoE takes advantage of proven capabilities, such as long distance transmission and high bandwidth. Gigabit Ethernet cameras typically need a separate cable to supply the power, in addition to the data cable.

 

The IEEE published its IEEE 802.3a Power over Ethernet (PoE) standard to specify how to deliver power over standard Ethernet cables. This allows up to 48 V of DC power to PoE-compliant devices over eight-wire Cat 5 and Cat 6 cables.

 

A standard CAT5 Ethernet cable has four twisted pairs, but only two of these are used for 10BASE-T and 100BASE-T. The specification allows two options for using these cables for power:

 
  • Use of spare pairs. Figure 2 shows the pair on pins 4 and 5 connected together to form a positive supply, and the pair on pins 7 and 8 connected to form a negative supply.
Figure 2. Power over spare pairs
  • Use of data pairs. Because Ethernet pairs are coupled with a transformer at each end, it is possible to apply DC power to the center tap of the isolation transformer without upsetting the data transfer. In this mode of operation the pair on pins 3 and 6 and the pair on pins 1 and 2 can be of either polarity. This is shown in Figure 3.
Figure 3. Power over the data pairs

This specification does not allow both sets of wires to be used - a choice must be made. The Power Sourcing Equipment (PSE) applies power to either set of wires and the Powered Device (PD) must be able to accept power from both options.

 

The voltage is nominally 48 V, and about 15.4 W of power is available at the Powered Device. An isolated DC-DC converter transforms the 48 V to a lower voltage more suitable for the electronics in the Powered Device, while maintaining 1500 V of isolation for safety reasons.

 

An obvious requirement of the specification is to prevent damage to existing Ethernet equipment. A "discovery process", executed from the Power Sourcing Equipment, examines the Ethernet cables to look for devices that comply with the specification. It does this by applying a small current-limited voltage to the cable and checks for the presence of a 25 k�[ resistor in the remote device. Only if the resistor is present is the full 48 V applied, but this is still current-limited to prevent damage to cables and equipment in fault conditions. Table 2 shows the comparison of the industrial digital camera interface standards that provide the single cable solution.

Table 2. Comparison of industrial digital camera interfaces

Combining It All

 

Designing, installing and maintaining wiring has always been the major cost component in vision systems. Delivering power over the data or communication cable is a very useful feature in the industrial vision market. With a single cable solution, industrial vision systems can provide simplified installation, lower maintenance, and reduced total cost of ownership. Future generations of digital cameras will likely reduce wiring requirements even further.

ADLINK's solutions for PCI Express® Frame Grabber Cards

 

ADLINK provides a series of PCI Express® (PCIe) products for industrial machine vision applications. The PCIe bus provides high-bandwidth and robust point-to-point interconnects, and complete software compatibility with the existing base of operating system, PCI drivers, and software. The PCIe bus also provides a dedicated link for image data transmission.

 

ADLINK provides several types of frame grabber cards, including:

  • PoCL (Power over Camera Link®)
Link

PCIe-CPL64
The PoCL standard allows the camera link able to supply power to the camera through the Camera Link connector without losing backward compatibility with the previous Camera Link standard. This solution is particularly suitable for a small camera.

  • IEEE 1394.b
Link
Link

PCIe-FIW64/PCIe-FIW62

  • Plug-and-play operation and easy maintenance
  • Power over cable for reduced wiring
  • PoE(Power over Ethernet)
Link

GIE62+

  • Simplify installation: Combine the data line, and power line in to single cable solution
  • Long cable length: Gigabit Ethernet cables up to 100 m
  • Link Aggregation: Double-speed backbone network that transfers much more image data.
  • Analog

PCIe-RTV24/PCI-RTV24/PCI-MPG24
Real-time signals: No network latency or protocol overhead.


Related ADLINK Links:

  • More about ADLINK Machine Vision
  • More about ADLINK PCIe-CPL64
  • More about ADLINK PCIe-FIW64
Mechanical Computer Vision Applications - Key Punch Image Location System Design List Pick and Place
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