SiePortal

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

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 TCP

6/2/2014 12:38 PM	Rate (0)
Frenzie1979 Posts: 3 Rating: (0)	I am using Siemens CP443-1 to communicate with subsea equipment. Communication is Modbus TCP. When collisions occurs retransmissions are triggered. If a Modbus request is not answered from the server, and a new request is triggered from the application,one frame contains two Modbus telegrams.Could this error be related to the application or to the hardware/firmware? As shown in attached screenshot, trans:25050 is first retransmitted by TCP three times. Then an "application retransmit" is done, containing two "Modbus/TCP" parts. Attachment C:\Users\nor92858\Desktop\Retransmissions with two modbus_tcp.jpg (109 Downloads)
Frenzie1979 Posts: 3 Rating: (0)	Last edited by: Frenzie1979 at: 6/2/2014 1:46 PM
Suggestion To thank Quote Answer

6/2/2014 1:23 PM	Rate (0)
Khaled_Ezzat Silver Member Joined: 9/7/2007 Last visit: 10/9/2024 Posts: 550 Rating: (62)	Frenzie1979 I am using Siemens CP443-1 to communicate with subsea equipment. Communication is Modbus TCP. When collisions occurs retransmissions are triggered. If a Modbus request is not answered from the server, and a new request is triggered from the application,one frame contains two Modbus telegrams.Could this error be related to the application or to the hardware/firmware? DearFrenzie1979 Your request requires more data so that we can help. Kindly illustrate by screen shots or photos.
	Best Regards
Suggestion To thank Quote Answer

6/2/2014 1:49 PM	Rate (0)
Niranjan Prasad Posts: 691 Rating: (37)	Basically when the programme generates initiates the querry the device takes time to response that querry and because of this it genetates eror Try to put some delay in the next querry request
Niranjan Prasad Posts: 691 Rating: (37)
Suggestion To thank Quote Answer

6/2/2014 8:22 PM	Rate (0)
Kaulquappe Posts: 3093 Rating: (324)	Hello Frenzie, do you use standard modbus blocks? If yes, which ones? Do you get any error message? Regards, Kaulquappe
Kaulquappe Posts: 3093 Rating: (324)
Suggestion To thank Quote Answer

6/3/2014 9:34 AM	Rate (0)
Frenzie1979 Posts: 3 Rating: (0)	I am using FC50 & FC60. Only thing I have access to is wireshark logs, and some alarmlists I`ve received from customer. Connection to client is eventually lost. BR Frenzie
Frenzie1979 Posts: 3 Rating: (0)
Suggestion To thank Quote Answer

6/3/2014 2:32 PM	Rate (0)
Kaulquappe Posts: 3093 Rating: (324)	Hello Frenzie, Siemens offers a Modbus library 2XV9 450-1MB00. www.siemens.com/s7modbus Regards, Kaulquappe
Kaulquappe Posts: 3093 Rating: (324)
Suggestion To thank Quote Answer

Share this page:

Share this page on...