Skip to Content

Register Login

Industry Online Support

Technical Forum

Navigation

Implementting Modbus Master RTU in PCS7

Created by: NimaMoaddeli at: 5/29/2009 2:26 PM (7 Replies)

Rating (6)

Thanks 10

8 Entries

5/29/2009 2:26 PM	Rate (0)
NimaMoaddeli Posts: 32 Rating: (0)	Dear Experts, Would you please give us an easy sample of implementing Modbus Master RTU (With CP341) ? Please with sample project or step by step decription. Best Regards
NimaMoaddeli Posts: 32 Rating: (0)
Suggestion To thank Quote Answer

6/1/2009 1:56 PM	Rate (4)
Danielle Posts: 1275 Rating: (123)	Hi, I don't have an easy sample... but are you using the S7HMODM3 Modbus-Master Communication package? It makes the communication between an S7/PCS 7 and modbus slaves quite easy... I've attached a manual with a step-by-step on how to use it. Best regards, Danielle Attachment PCS7_S7HMODM3_v3.0_E.pdf (4172 Downloads)
Danielle Posts: 1275 Rating: (123)
Suggestion To thank Quote Answer
This contribution was helpful to 5 thankful Users how come sunn7 Sudeepk KARTHIK_FOX JazTai

6/1/2009 1:58 PM	Rate (2)
Danielle Posts: 1275 Rating: (123)	Also... here's the Modbus Master manual... Siemens' libraries make life much easier... Attachment Modbus Master.pdf (3281 Downloads)
Danielle Posts: 1275 Rating: (123)
Suggestion To thank Quote Answer
This contribution was helpful to 4 thankful Users how come sunn7 KARTHIK_FOX JazTai

6/2/2009 6:34 AM	Rate (0)
NimaMoaddeli Posts: 32 Rating: (0)	Thanks for your reply, but It seems that I have solved my problem using FB7 and FB8 and I'm communicating with my slave. As soon as I make my Program reliable I will Attach it here for all who always suffer from modbus communication in SIEMENS.
NimaMoaddeli Posts: 32 Rating: (0)
Suggestion To thank Quote Answer
This contribution was helpful to 1 thankful Users davari25x

3/13/2016 6:06 AM	Rate (0)
GauravJoshi1989 Posts: 86 Rating: (2)	Can you please share how you did the modbus communication in PCS7 using FB7 & FB8? I had written logic in OB1 using FB7 and FB8 and prepared Send and Receive DBs. But the problem I am facing that everytime I make changes in the DB, I have to download all the blocks. And another issue is even I do make changes in the SEND DB, the values are not changing even after download. Thanks, GJ Attachment Modbus Logic.jpg (1502 Downloads)
GauravJoshi1989 Posts: 86 Rating: (2)
Suggestion To thank Quote Answer

3/14/2016 4:04 AM	Rate (0)
Ravi123@ Bronze Member Joined: 6/11/2007 Last visit: 1/6/2025 Posts: 61 Rating: (7)	Hi Gaurav Here is link for CP340/CP341 modbus RTU program without dongle for S7-300.You can try the same in PCS7 . Although these blocks will not generate any faceplates but still you can use them to read values from modbus master/slave. https://support.industry.siemens.com/tf/gb/en/posts/modbus-rtu-master-for-cp340-341-441-x-no-dongle-required/111091/?page=0&pageSize=10 Thanks Ravi
	Thanks Ravi
Suggestion To thank Quote Answer

11/14/2016 9:26 AM	Rate (0)
mogh2013 Advanced Member Joined: 10/28/2015 Last visit: 1/15/2025 Posts: 2 Rating: (0)	please insert back up off your project in here till we learning how we can configure modbus RTU (cp341) in pcs7.

Suggestion To thank Quote Answer

7/31/2017 7:40 AM	Rate (0)
Jen_Moderator Diamond Member Joined: 6/19/2017 Last visit: 9/6/2024 Posts: 8175 Rating: (174)	New question published by HarePrasath is split to a separate thread with the subject S7HMODM3 library for RS485 communication. Best regards Jen_Moderator

Suggestion To thank Quote Answer

|

Share this page:

Share this page on...

Follow us on