Follow along for an enriching discussion with our CEO, Peter Herweck, and industry leaders for a captivating Global Keynote at #InnovationSummit Paris 2024. Watch recording and join the #ImpactMaker movement!️
Scadapack RS485 comm issues
Remote Operations Forum
Support forum for Schneider Electric SCADA systems, radios and RTUs. From commissioning integration devices and software, to enhancing existing installations or troubleshooting.
Send a co-worker an invite to the portal.Just enter their email address and we'll connect them to register. After joining, they will belong to the same company.
You have entered an invalid email address. Please re-enter the email address.
This co-worker has already been invited to the Exchange portal. Please invite another co-worker.
Please enter email address
Send InviteCancel
Invitation Sent
Your invitation was sent.Thanks for sharing Exchange with your co-worker.
Link copied. Please paste this link to share this article on your social media post.
Posted: 2022-04-1012:13 AM
Scadapack RS485 comm issues
I am having issues communicating to a valve on an RS485 network. There are a total of 10 valves and the RS485 is daisy chained starting from the PLC to the first valve, and onwards to the last valve. The issue is I can see all of the valves utilizing modscan, except the first one the PLC is daisy chained to. I am not sure if there are termination resistors wired. Is there any reason I cannot see the first valve in the daisy chain but all others?
Link copied. Please paste this link to share this article on your social media post.
Posted: 2022-04-1110:37 AM
Hi Kevin,
Attached is an old document I sometimes refer to when dealing with an RS-485 issue. Please dig into that and check all the various issues discussed. One other item to consider is "What's different about that first valve?" Maybe different firmware, maybe a different switch setting, maybe a poor terminal connection, could be any of many different things...
Joel
Joel Weder Remote Operations Specialist Schneider Electric