Ask Me About Webinar: Data Center Assets - Modeling, Cooling, and CFD Simulation
Join our 30-minute expert session on July 10, 2025 (9:00 AM & 5:00 PM CET), to explore Digital Twins, cooling simulations, and IT infrastructure modeling. Learn how to boost resiliency and plan power capacity effectively. Register now to secure your spot!
Modicon PAC Forum
A forum for topics related to the scope of Modicon PAC offers and ecosystem along the whole lifecycle: Modicon M580 and 340, EcoStruxure Control Expert, EcoStruxure Process Expert (Unity Pro) and more.
Link copied. Please paste this link to share this article on your social media post.
Posted: 2025-09-05 08:54 AM
Hello,
I am looking to get some clarity on what the "Offset/Device" field specifies when configuring Modbus TCP/IP communications through the DTM Browser/IO Device Editor (windows shows: "fdtConfiguration").
It appears that the Offset/Device does not line up with the RD Address/RD Length, but instead just increments to the next multiple of 8 available. In the manual, the only reference I can find states that both Offset/Device and Offset/Connection represent the byte address, however this does not appear to be the case.
Thank you!
Link copied. Please paste this link to share this article on your social media post.
Link copied. Please paste this link to share this article on your social media post.
Posted: 2025-09-08 09:34 PM
Had you created other transactions and then modified or deleted these?
Link copied. Please paste this link to share this article on your social media post.
Link copied. Please paste this link to share this article on your social media post.
Posted: 2025-09-09 07:19 AM
That is possible as there were many hands involved in development. Are you saying that ControlExpert would auto-index the 'offset/device' field, and then further modifications to the device (removing entire requests, updating RD addresses, etc) could potentially cause items to de-sync?
I may try removing/re-creating the mapping to see if the offsets change.
Link copied. Please paste this link to share this article on your social media post.
Create your free account or log in to subscribe to the board - and gain access to more than 10,000+ support articles along with insights from experts and peers.