FAQ: Is it possible to route the POT and NOT signals through DeviceNet on an MP940D?
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Technically Yes, but care must be taken to insure safety.
Positive Over Travel (POT) and Negative Over Travel (NOT) are considered critical I/O, and their function is controlled within the SGDH amplifier by default. This strict control insures that motion will stop given an OT situation. Caution should be used when trying to control such an event over a network, particularly if the network is disconnected (in this case, the controller must immediately stop motion if network heartbeat is lost).
These inputs which are wired into the SGDH, are then mapped into the MP940 controller (every 125microsec) to be used for further decision making in the MotionWorks or MotionWorks+ program. All 7 isolated inputs into the SGDH 1CN connector can be read from IWC025 bits 0,1,2,3,4,5, and 6 (or "Sigma_*" inputs from MW+). To view any of these through DeviceNet, simply map the inputs to a DeviceNet output, then each DeviceNet scan will have updated info for other nodes (this is Polled I/O).
SAFETY PRECAUTIONS AND INSTRUCTIONS FOR USE OF FAQ INFORMATION!
Please read and understand the product instruction manual before installing, servicing or operating Yaskawa products. FAQ content and illustrations are provided as technical advice to augment the information in manual, not supersede it. It is not possible to give detailed instructions for all types of installation or support activities. The information described in the FAQs are subject to change without notice to improve the product or FAQ. Yaskawa assumes no responsibility for errors or omissions or damages resulting from the use of the information contained in any FAQ. All warnings, cautions and product instruction for product use must be followed. Installation, operation and maintenance should be carried out by qualified personnel. Failure to observe these and other precautions highlighted in the product manuals will expose the user to high voltages resulting in, serious injury or death. Qualified personnel are defined as individuals who are familiar with the installation, starting, operation and maintenance of Yaskawa products of the type described and have proper qualifications to perform the work.
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Waukegan, IL 60085