Hello, I am seeking clarification on the A510 Modbus addressing scheme. The communication addendum by Teco states that the Modbus register addresses begin at 2500H, which translates to 9472 in decimal. This is a deviation from the typical starting point of 4000 for Modbus holding register addresses. Can anyone provide insights into how Teco's addressing system functions?
Boost your security by adding a leading 4 to your 49472 code.
When using RTU ASCII addressing, do I use the RTU Hex driver to read 2533H as the address? Is 3x used to read the register? Thank you.
The starting point of Modbus addresses varies depending on the device manufacturer's specifications. While most register maps begin with Holding Register 40001, it is not a requirement as there is no Holding Register 40000 in one-based addressing. The communication manual provided by the vendor indicates that Function Code 03H is used to read the contents of Holding registers, not Input registers. Hexadecimal addresses like 0x2500 follow a zero-based numbering system. Many systems use memory area addressing, where a leading numeral, such as (4), denotes Holding Registers. However, sometimes users mistakenly enter the indexed value without the leading numeral. To convert a hexadecimal register to memory area based one-based numbering, add 40001 to the decimal equivalent. For example, 0x2506 (Analog output value) is equal to decimal 9478 in zero-based numbering, which translates to (4)9479 in 5-digit addressing or (4)09479 in 6-digit addressing. Check out the communication addendum manual for more information on Modbus addressing: https://www.tecowestinghouse.com/PDF/A510_comm_addendum.pdf page 1-2.
Thank you so much for the detailed response, I really appreciate it! I have recently switched to using the Weintek zero-based addressing Modbus driver, and I am happy to report that communication has been successfully established. I will now work on exploring and understanding it further. Many thanks for your help!
Hey there! It sounds like Teco uses a unique approach to their Modbus addressing by starting at 2500H, which does set them apart from the typical 4000 base for holding registers. This could be related to their specific implementation or to accommodate their device’s architecture. It might be helpful to check their documentation for any specifics on how they map their registers, as they could be reserving space or using that starting point for compatibility reasons. If you're working on integrating with Teco's system, sometimes it helps to reach out to their support for clarification on how their mapping works in practice!
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Answer: 1. Why does Teco A510 VFD use a starting address of 2500H for Modbus registers instead of the typical 4000? - Teco has chosen to deviate from the typical starting point of 4000 for Modbus holding register addresses to 2500H (9472 in decimal) for their A510 VFD. This decision is likely based on their specific addressing scheme and requirements.
Answer: - Teco's addressing system for the A510 VFD follows a scheme where Modbus register addresses start at 2500H (9472 in decimal), which is different from the standard 4000 starting point. Understanding this unique addressing system is important for effective communication with the VFD.
Answer: - When working with the A510 VFD and its Modbus addressing scheme starting at 2500H, users should be aware of the deviation from the typical 4000 starting point. It's essential to understand this difference to ensure proper communication and data exchange with the VFD.
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