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Interlift

CANopen Lift, the standardized network for lifts and elevators

Published 2013-12-19

The CANopen Lift application profile defined in the CiA 417 specification demonstrated its interoperability capabilities in the demonstrator shown at the Interlift tradeshow. In addition, several companies have proofed the interoperability of their CiA 417 products at the 7th plugfest.

The CANopen Lift demonstrator shown at the Interlift tradeshow consists of four independent networks connecting several CiA 417 controllers and units

CANOPEN LIFT IS THE ONLY STANDARDIZED NETWORK for lifts and elevators. No matter if you speak British (lift) or American English (elevator), CiA 417 compliant devices can understand each other: they are interoperable. In order to proof the interoperability, CAN in Automation (CiA), the international users’ and manufacturers’ association, has organized the development of a CANopen Lift demonstrator. Several CiA members have submitted their products. The demonstrator, which comprises four different lift applications, was exhibited at the Interlift exhibition in Augsburg (Germany) at the CiA booth.

“Our demonstrator was one of the attractions on the Interlift,” said Julia Adolf, responsible for the CiA booth, “CANopen Lift is a mature standard, which is publically available.” Joerg Hellmich, who works with Elfin and who is chairman of the SIG Lift, added: “CANopen Lift is going to take off, the number of companies implementing CiA 417 is increasing.”

Sprinte is the first French control system supplier providing a CiA 417 compliant product, which is part of the demonstrator and communicates with products from Liftequip (car drive), Elgo (encoder), and Kronenberg (panels). The other two controller providers are Böhnke & Partner, now a company of the Schmersal group, and Weber Lifttechnik. CiA 417 car drives used in the demonstrator are by Control Techniques, Liftequip, and Ziehl-Abegg. Door controllers from Wittur and encoders from different vendors are integrated in the demonstrator, too. The panels integrated in the demonstrator from Kronenberg, Masora, Schaefer, and Safeline are connectable to all CiA 417 controllers. “You can even exchange the individual panel boxes,” explained Julia Adolf, “and the system still works.” The controllers read the object dictionary of the panels and know their functionality.

The participants of the 7th CANopen Lift plugfest proofed the interoperability of their CiA 417 products with control systems by different manufacturers

Interoperability of CANopen Lift devices is also proofed by means of plugfests. At the 7th plugfest organized by CiA the participating parties tested in particular new devices or new functions. Micelect tested its LM-CANopen load-measuring device communicating with different lift controllers for the first time. Böhnke & Partner and Ziehl-Abegg proofed the recently introduced software download by means of the boot-loader. Additionally, some stress tests were performed. Oskar Kaplun, CiA’s Technical Manager, said: “At the next plugfest we will put devices with high busloads under stress.”

New CANopen Lift players

The ASP116 lift controller by Sprinte provides two CiA 417 compliant CANopen interfaces running at 250 kbit/s. The open-style CAN connector has three contacts (CAN-H, CAN-L, and CAN-GRD). For each interface there are two state LEDs that conform to CiA 303-3. The controller uses the node-ID 1 and is suitable for applications with up to 32 floors. Sodimas, another French company, is also going
to implement CiA 417.

The ASP116 is the first French lift controller compliant with CiA 417; it has already been introduced into the CiA demonstrator

Intec has developed the MLC-4000 CANopen Lift controller. At Interlift, it was shown at the KLST (Klinkhammer) booth, just behind the CiA stand. The product comes with a diagnostic tool and a handheld tool for configuration purposes. Another company offering CiA 417 control systems is Georg Kuehn Steuerungstechnik. The company participated in the last CANopen Lift plugfest with its product.

At the Interlift, Kollmorgen has announced their support of CANopen Lift. The MPK411 already provides a CiA 417 compliant interface for panels. Communication with the car drive unit (inverter) and the door control unit from third parties is optionally also possible via CANopen Lift. Besides the above-mentioned CiA 417 frequency inverters, Gefran has introduced the ADL300 CANopen Lift option for its SIEI drive family. The product is also available with CiA 402 software. The inverter features eight local digital input ports and four local relay outputs. By means of extension cards, the I/O capability can be increased. Encoders can also be connected locally. The drive with an integrated keypad supports velocity and position control modes. Micontrol has launched its Mcontrol drive dedicated tor lift and crane applications. The product features CANopen connectivity.

The Limax33 Safe position sensor sends CiA 417 or CiA 406 compliant PDOs containing the position of the lift car

Meiller’s Genius Plus roll-up door uses the AT40M door drive by Siemens, which comes optionally with a CiA 417 compliant interface. The drive is able to move a door leaf mass of up to 600 kg. Wittur also offers 600-kg door drives with CiA 417 compliant interfaces. These products offer specified speeds up to 1 m/s consuming up to 900 W. Both companies also provide CANopen door drives for lower weights, lower speeds, and less power consumption.

As an alternative to rotational encoders, Elgo offers magnetic tape based linear position sensors. The recently introduced Limax33 Safe complies with EN 81-1/2 and provides a Safety Integrity Level (SIL) of 3. The redundant sensor permanently crosschecks the measurements. The magnetic measuring principle makes the sensor insensitive even to black smoke and splash water. The product comes with a CANopen interface compliant with CiA 417 or CiA 406. Optionally, the interface supports the CANopen Safety (EN 50325-4) protocol.

Improvement of the CiA 417 profile

At the beginning of December, the SIG Lift met and decided to improve the existing CiA 417 specification. Besides minor corrections and better descriptions, the experts discussed several functional extensions, amongst them the emergency telephone function. Other improvements dealt with additional parameters for the car drive unit and the load-measuring unit. There were other proposals, for example to modify the use of some of the Emergency message bytes or how to react to detected errors more quickly. In the next meeting the group will discuss all submitted proposal and will decide how to proceed with them. Already accepted were the submissions for the lift light management, the RFID, and the additional VT52 command.