I am seeking assistance in configuring the ABB ACQ580 drive connected to a Mitsubishi PLC using Modbus communications. I am struggling to convert the RPM and Hz readings using parameters and have to send the raw value of 20000. Can this conversion be done in the drive, or should it be done in the PLC software? Any guidance would be appreciated as I am new to this and constantly learning. Thank you, Bob.
After reviewing pages 248, 488, and 506 of the ACQ580 Firmware Manual, it appears that the Modbus value range is -20000 to +20000 when parameter 58.26 or 58.27 is configured for "Speed or frequency" (0), "Speed" (4), or "Frequency" (5). Parameters 46.01 and 46.02 determine the interpretation of a Modbus value of 20000 within the drive. For instance, if 46.01 is set to 1800.00 rpm, a Modbus value of 20000 corresponds to a speed of 1800.00 rpm, while a Modbus value of 10000 corresponds to a speed of 900.00 rpm. To ensure compatibility with a Mitsubishi PLC, you may need to adjust the scaling of the Modbus value to align with parameters 46.01 and 46.02 in the drive. Alternatively, modifying parameters 58.26 and 58.27 to "Transparent" (1) or "General" (2) could sync the Modbus value with the drive's frequency/speed value (or 100x the value for "General" (2)). Remember to power cycle the drive for changes to take effect. Please note that the instructions assume access to Modbus registers 400002 (Reference 1) or 400003 (Reference 2).
According to jschulze, the ACQ580 Firmware Manual indicates that the Modbus value range is -20000 to +20000 when parameter 58.26 or 58.27 is set to "Speed or frequency" (0), "Speed" (4), or "Frequency" (5). Parameters 46.01 and 46.02 determine the interpretation of a Modbus value of 20000 for the drive. For instance, if 46.01 is set to 1800.00 rpm, a Modbus value of 20000 corresponds to a speed of 1800.00 rpm. To match the scaling defined by parameters 46.01 and 46.02 in the drive, the Modbus value in the Mitsubishi PLC needs to be adjusted. Alternatively, changing parameters 58.26 and 58.27 to "Transparent" (1) or "General" (2) on the drive may align the Modbus value with the frequency/speed value of the drive, or 100 times the value if set to "General" (2). A power cycle of the drive may be required for settings to take effect when making changes. This solution assumes access to Modbus registers 400002 (Reference 1) or 400003 (Reference 2). Bob, thank you for addressing the issue. When the site's monitoring system displays values of 20000 instead of 50Hz or rpm, it can cause confusion for engineers. Your feedback on trying the transparent and general settings or making software adjustments is appreciated. Please update on your findings after testing on site. Best regards.
Hey Bob, based on my experience, I'd suggest handling the conversion within your PLC software. This approach generally allows for more flexibility. The ABB ACQ580 should output the RPM and Hz values but it takes raw Modbus data, not specifically converted data. So, it is often more straightforward to accept this raw data and convert it in your Mitsubishi PLC. This way, if you need to make tweaks or adjustments later, you're only dealing with programming changes, and not trying to wrestle with a piece of hardware. Hope this helps and don't hesitate to ask if you have more questions! Keep up the learning spirit.
Hi Bob, it's always exciting navigating new territory! In your situation, it may be easier to handle this in the PLC software, especially if you are going to use those readings in more places, thus avoiding expensive additional hardware. The ABB ACQ580 drive can indeed output raw RPM and Hz values, and scaling the readings in the PLC could provide a more effective solution. In terms of software, the Mitsubishi GX Works platform is pretty adept at these conversions. Remember to set the scaling factor so you can interpret these raw values correctly. Keep going, the learning curve is steep, but so rewarding!
Hi Bob, it does sound like you're on a learning curve! Either method you mentioned could work, but in my experience, it's often more practical to handle the conversion in the PLC software. Doing it this way provides you with more flexibility should you want to make any modifications in the future. If you do decide to go this route, most PLC software has built-in function blocks that should make the conversion from raw to actual quite straightforward. Good luck and keep learning!
Hey Bob, personally, I'd recommend handling the conversion in the PLC software. That way, you can make adjustments without interacting directly with the drive. It provides greater flexibility and scalability in the long run. However, keep in mind that optimizations like these may vary depending on the specifics of your application and system. By the way, for the conversions related to RPM and Hz, you might find the scale (SCAL) function in your PLC software really handy. Enjoy the learning journey—it's pretty rewarding as you solve these puzzles!
Hi Bob! It sounds like you're diving into some interesting stuff with the ACQ580 and Mitsubishi PLC. For your situation, while the drive itself can handle some basic scaling, it’s usually more flexible to manage conversions in the PLC software. This way, you can tailor the calculations to your specific needs without being limited by the drive’s settings. I’d recommend double-checking the drive’s manual for specific Modbus registers but performing the RPM and Hz conversions within the PLC might give you more control over the process. Keep experimenting, and you'll get the hang of it! Good luck!
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Answer: 1. How can I convert RPM and Hz readings on an ABB ACQ580 drive connected to a Mitsubishi PLC using Modbus communication? - The conversion of RPM and Hz readings can be done either in the drive itself or in the PLC software. You can choose to perform the conversion based on your system requirements and ease of implementation.
Answer: - To convert the raw value of 20000 for RPM and Hz readings, you may need to refer to the user manual of the ABB ACQ580 drive and the documentation for the Mitsubishi PLC to identify the specific parameters and formulas required for the conversion.
Answer: - You can refer to the user manuals, technical documents, and online resources provided by ABB and Mitsubishi for detailed guidance on configuring the ACQ580 drive with a Mitsubishi PLC using Modbus communications. Additionally, seeking assistance from experienced professionals or contacting technical support from both companies can also be helpful.
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