Skip to Content

SiePortal

The integrated platform for your product selection, buying and support workflow - bringing together Industry Mall and Online Support.

SiePortalDeutsch

Search

Home
Support Support
{{(apiData.Support | filter:{'rank':1}:true)[0].title}} Support
- Menu temporary not available
- Menu temporary not available
- Menue temporary not available
- {{item.title}}

Products & Services
- Menu temporary not available
- Menue temporary not available
- {{item.title}}
Support Support
{{(apiData.Support | filter:{'rank':1}:true)[0].title}} Support
- Menu temporary not available
- Menue temporary not available
- {{item.title}}
MySiePortal MySiePortal
{{(apiData.MySiePortal | filter:{'rank':1}:true)[0].title}} MySiePortal
- Menu temporary not available
- Menue temporary not available
- {{item.title}}
Cart ({{apiData.CartCount}})

Navigation

Logo + Modbus 8 Relay TCP do not controll more than one relay

Created by: andrzej_sierpinski at: 12/23/2024 9:14 PM (5 Replies)

Rating (0)

Thanks 1

6 Entries

12/23/2024 9:14 PM	Rate (0)
andrzej_sierpinski Joined: 11/28/2024 Last visit: 1/5/2025 Posts: 4 Rating: (0)	Hi all, I have a problem with Logo 8.4 and Modbus TCP. I have a board set of 8 relays controlled by Modbus TCP. The problem is that only one relay is controllable via Logo. I set a different modbus address for each, but only one works. Does anyone know what the problem could be? Attachment Zrzut ekranu 2024-12-23 221126.png (167 Downloads)

Suggestion To thank Quote Answer

12/23/2024 11:19 PM	Rate (0)
PADRE PIO Member Joined: 4/11/2022 Last visit: 9/9/2025 Posts: 90 Rating: (7)	Hi my friend! I will suggest an easy way to do this. Find attached my program to help you. In my program I am using NQ1 and NQ2 as you did. Recommendations... Check "Tools -> Ethernet Connections". Be sure that checkbox "Allow ModBus acess" must to be checked. Create a new connection of "ModBus Server" and set port 502 and check "accept all connections" requests. I am using a simulator ModBus Scan64 that is free of charge for 30 days. If you have any questions please let me know. Attachment files.zip (167 Downloads)
	Rgds, Padre Pio Automation
Suggestion To thank Quote Answer

12/23/2024 11:28 PM	Rate (0)
PADRE PIO Member Joined: 4/11/2022 Last visit: 9/9/2025 Posts: 90 Rating: (7)	Also find the table that guide us to locate the properly modbus address according the LOGO variable. Attachment ModBus table.png (178 Downloads)
	Rgds, Padre Pio Automation
Suggestion To thank Quote Answer

12/24/2024 10:27 AM	Rate (0)
andrzej_sierpinski Joined: 11/28/2024 Last visit: 1/5/2025 Posts: 4 Rating: (0)	I did as you suggested, but it didn't change anything (just one relay works on-off in 2 second intervals) If I set the control to only one relay coil, doesn't matter which one it is (from the range 1-8), the program works correctly. The problem occurs when I want to control more than one relay - then only one works, and the others don't. It seems that one active protocol is "clogging" the rest of the connection and blocking the whole thing I don't know why an additional grayed-out connection appears in the Ethernet connections window? Attachment Zrzut ekranu 2024-12-24 112250.png (160 Downloads)
	Last edited by: andrzej_sierpinski at: 12/24/2024 10:30:04 Last edited by: andrzej_sierpinski at: 12/24/2024 10:32:28
Suggestion To thank Quote Answer

12/24/2024 10:28 AM	Rate (0)
andrzej_sierpinski Joined: 11/28/2024 Last visit: 1/5/2025 Posts: 4 Rating: (0)	andrzej_sierpinsk I don't know why an additional grayed-out connection appears in the Ethernet connections window? It looks like that: Attachment Zrzut ekranu 2024-12-24 112514.png (163 Downloads)

Suggestion To thank Quote Answer

12/24/2024 1:54 PM	Rate (0)
andrzej_sierpinski Joined: 11/28/2024 Last visit: 1/5/2025 Posts: 4 Rating: (0)	Problem solved. it turned out that the 8-relay module had to be configured from "client" to "server". Thanks PADRE PIO for the help.

Suggestion To thank Quote Answer
This contribution was helpful to 1 thankful Users PADRE PIO

|

Share this page:

Share this page on...

Follow us on