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

Modbus RTU communication

Created by: PPPD at: 5/14/2014 7:55 AM (6 Replies)

Rating (1)

Thanks 4

7 Entries

5/14/2014 7:55 AM	Rate (0)
PPPD Advanced Member Joined: 7/19/2008 Last visit: 9/10/2024 Posts: 60 Rating: (8)	Hi, i have a communication with the AB plc over modbus rtu RS485 using CP341. I have configured the communication with all the parameters given by the other PLC. Further to mention our 341 is acting as master and the slave is on the other End. After configuration the communication is tested independently on boith the ends using ModScan and Modsim simulation softwares and thus succesful communication is noted. when the communication link is made through between both the Modbus cards then we find that the communication doesnot happen. The shocking part is there is no specific error registered on our communication block. Has any one found such a kind of behaviour. Please help to resolve this situation.

Suggestion To thank Quote Answer

5/14/2014 9:37 AM	Rate (0)
n00dels Experienced Member Joined: 4/8/2013 Last visit: 2/27/2025 Posts: 95 Rating: (7)	what "communication block" are you using?

Suggestion To thank Quote Answer

5/14/2014 10:27 AM	Rate (0)
hdhosseini Diamond Member Joined: 1/28/2009 Last visit: 3/8/2025 Posts: 6860 Rating: (1366)	P@R@G Hi, i have a communication with the AB plc over modbus rtu RS485 using CP341. I have configured the communication with all the parameters given by the other PLC. Further to mention our 341 is acting as master and the slave is on the other End. After configuration the communication is tested independently on boith the ends using ModScan and Modsim simulation softwares and thus succesful communication is noted. when the communication link is made through between both the Modbus cards then we find that the communication doesnot happen. The shocking part is there is no specific error registered on our communication block. Has any one found such a kind of behaviour. Please help to resolve this situation. Hello, The best solution for communication for PCS 7 applications can be found HERE .It is odd if you don't have any status or error in your FB for communication. Internal buffer of CP341 can keep some valueable information regarding errors in communication and remedies can be found in online manual or the related manuals. Best regards, Hamid Hosseini
	Demo Channel on Youtube
Suggestion To thank Quote Answer

5/14/2014 10:43 AM	Rate (0)
Ammy Platinum Member Joined: 4/19/2008 Last visit: 11/21/2024 Posts: 1525 Rating: (159)	P@R@G Hi, i have a communication with the AB plc over modbus rtu RS485 using CP341. I have configured the communication with all the parameters given by the other PLC. Further to mention our 341 is acting as master and the slave is on the other End. After configuration the communication is tested independently on boith the ends using ModScan and Modsim simulation softwares and thus succesful communication is noted. when the communication link is made through between both the Modbus cards then we find that the communication doesnot happen. The shocking part is there is no specific error registered on our communication block. Has any one found such a kind of behaviour. Please help to resolve this situation. Hello P@R@G, Can You Please Provied the Detail of the Block you used, Which area of Modbus you are communicating, if its work with Simulation (Modsim) then it will work with Actual Hardware also, then only need to set is the your Setting in side the CP341 with ABB side.
	Ammy New for every one.............. “No duty is more urgent than that of returning thanks.” If Problem Solved......! I can't help you privately - please post in the Forums
Suggestion To thank Quote Answer
This contribution was helpful to 1 thankful Users Yahu

5/14/2014 1:26 PM	Rate (0)
Kaulquappe Posts: 3093 Rating: (324)	Hello Ammy, did you check the diagnostic buffer of the CP? Regards, Kaulquappe
Kaulquappe Posts: 3093 Rating: (324)
Suggestion To thank Quote Answer

5/31/2014 9:20 AM	Rate (1)
Krrish !! Posts: 73 Rating: (6)	Hi, Here is a document for Modbus RTUcommunication prepared out of standard procedure and past experience. Hope it is useful. Regards, Krrish !! Attachment D:\Manual Collection\Application Note - Modbus Communication.pdf (339 Downloads)
Krrish !! Posts: 73 Rating: (6)	Last edited by: Krrish !! at: 5/31/2014 9:21 AM
Suggestion To thank Quote Answer
This contribution was helpful to 3 thankful Users hdhosseini RIAN Che tanmaydeokule

6/30/2014 11:25 AM	Rate (0)
CS Moderator Moderator Joined: 9/1/2005 Last visit: 3/10/2025 Posts: 4113 Rating: (195)	follow up question published by MauricioRCis split to a seperate thread with the subject Modbus RTU communication - need to assign all the new metering parameter addreses into the STEP 7 Best regards CS Moderator
	My Forum is the place to personalize your profile, track your topics, and maintain content that interests you. Best regards CS Moderator
Suggestion To thank Quote Answer

|

Share this page:

Share this page on...

Follow us on