FAQ: Are there any guidelines on how to read and write NS300 or NS500 Parameters using the basic Master-Slave I/O operation?
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Yes, but two important points must be stressed:
1. The application programmer must remember that handshaking is required to confirm the data was received and the operation is complete before continuing on to the next command. Relative to the master device CPU, Devicenet and Profibus are non-synchronized field bus networks. Although the NS300 or NS500 devices look like simple I/O to the master, a read or write parameter operation is internal to the NS300 or NS500 device it will take some time to complete. Handshaking and confirmation logic of these time dependant operations are required.
2. Second, depending on the master, the word size that the application code works with may be larger than the command code or data being sent or retrieved. Take as an example the AB Control Logix family of PLCs. If the application programmer is using the Control Logix as a master to an NS300, he or she must remember the word size the PLC code uses are 32-bit in length. The command to the NS300 is only 8-bits and the data may be, depending on the operation, 32-bit.
Below are links to two documents. One is a multiple page adobe PDF that has two flow charts: one for Parameter read and one for write. The read write operation will be successful if the application program logic follows the flow of the respective chart. The other document is for general NS300/500 trouble shooting.
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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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