FAQ: Is it possible for an SMC controller to do a PLS function?
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Yes, by using the MF or MR commands. After the trip-point clears, use the SB and CB commands to clear or set an output bit. This works very well when there are over six outputs that need to be fired in a very accurate amount of time. If there are 4 or less outputs, you can create a loop structure that uses the OB command like this OB [output],[logical condition] which will set and clear the outputs based on the logical condition being true or false. The SMC does not have built in PLS commands, but it is possible by programming with the above commands.
It is also possible to use this PLS scheme on an external encoder and get the information over Ethernet to other controllers. The auxiliary encoder info goes over Ethernet, updated at the slave update cycle, which has a four mSec minimum. The limitation on the auxiliary encoder is that the MF and MR commands only work with main encoder axes, so you have to make a mini program loop that checks the position of the auxiliary encoder. The fastest way to a PLS on an auxiliary encoder is to fan it out to all controllers.
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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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