FAQ: What are the possible causes of communication failure between an HMI and a MP9xx controller?
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Yaskawa has prepared start-up guides for many of the popular HMI products on the market today. These start-up guides are very helpful during startup. The MP products have port communication lights that blink rapidly when the MP product and the HMI are communicating properly.
If HMI communications cannot be established, investigate the following possibilities:
1) Ensure that the Memobus driver is installed in the proper directory and selected in the HMI Programming software.
2) Check the cable wiring, testing it pin for pin according to the wiring recommended in the Yaskawa start-up guide. With RS-422/485 communication, terminating resistors may be needed. Try removing the termination resistors if they are part of the circuit, or adding them if they were not. The success of terminating resistors sometimes depends on the characteristics of the cables used.
3) Check the digital ground and field ground (shield) connections. Make sure that the digital and field ground are separated. Follow the grounding/shielding recommendations in the start-up guide.
4) Check the communications protocol setting in both the HMI and the MP product (typically port 2). Select 19.2kBaud, Even Parity, 8 data bits, 2 stop bit, Memobus RTU transmission mode.
5) Make certain that the slave address is set properly.
6) Make sure the right MP series controller is selected. Some HMI products require this selection.
7) Verify that the active page on the HMI actually monitors/sets a valid MP register (any register MW/MB/MF/ML register within MW00000 thru MW32767).
For more information regarding specific startup and setup information, please click on this FAQ link FAQ.
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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