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

Communication between two 315PN/DP with PN connection.

Created by: Tiaportalia at: 1/15/2014 8:19 AM (6 Replies)

Rating (2)

Thanks 2

7 Entries

1/15/2014 8:19 AM	Rate (0)
Tiaportalia Posts: 18 Rating: (0)	Hello, Im new here and before i didnt knew there was such forum. Who know i can help other people and people help me. But i came here because i was searching for a solution. I have attached an image of my problem. First some intro: I have a Master PLC and a Slave PLC. Both are 315 PN/DP. They are connected with each other with an ethernet cable. The master PLC contains a program and the slave PLC contains a back up program which can do partly stuff connected on the slave PLC side.(When the master PLC fails) My first idea was to read out IO on the slave PLC into an DB and get them with a GET function from the master PLC into the IO DB of the Master PLC. Then run the program cyclus. After that send the output DB to the appropriate Outputs. And use the PUT function to send some DB outputs to the slave output DB. I want to read and write some Digital IO and Analoge IO to the "slave" PLC. When a watchdog fails the program on the Slave PLC should take over his own IO. I found out the PUT and GET functions are very slow?(Cannot GET all data in program cyclus?) Now i wonder if someone has an idea for faster connection. Or can i even access the perhiperal registers of the Slave PLC with the Master PLC trough Ethernet/Profinet? I also have seen something a while ago about a fast ethernet GET and PUT function? Or setting the PLC up as Master and Slave in hardware configuration? I use Tia Portal V12 as IDE. Attachment program buildup.jpg (188 Downloads)
Tiaportalia Posts: 18 Rating: (0)
Suggestion To thank Quote Answer

1/16/2014 8:11 AM	Rate (1)
Fafner Silver Member Joined: 3/20/2013 Last visit: 3/21/2025 Posts: 676 Rating: (44)	There is a compendium with decision guidance in which ways communication between CPUs can be established. Pls have a look. The data sent/received in one cycle is, of course, limited. But after you got all data you get the NDR status at your function, so you know when you have all requested data.
	Best Regards, Fafner
Suggestion To thank Quote Answer

1/16/2014 10:00 AM	Rate (0)
Tiaportalia Posts: 18 Rating: (0)	Because i want to read out the Slave inputs and synchronize them with the Master inputs. I can first GET the Slave input wait for NDR as callback and then transfer master input to DB. So all inputs of both PLC's are synchronized in the input DB of the Master PLC. I have looked into that document and i see the following communication blocks: (1) "USEND/URCV", BSEND/BRCV, "PUT, GET" (2) Load/transfer commands, DPRD_DAT, DPWR_DAT (3) TSEND/TRCV, TUSEND/TURCV (6) PNIO_SEND, PNIO_RECV (8) AG_SEND/AG_RECV (21) Controller 1 is server (for "PUT, GET") (22) Controller 2 is server (for "PUT, GET") I don't really understand the table betweet s7-300/s7-300 (Table 21-19) from the mentioned document. Also GET and PUT as asynchronous, so that's something to be aware of. As for speed, would TSEND/TRCV be faster? There you need to setup a Connection first with an IP address right? With TSEND/TRCV you don't need an ID because it's not a S7 connection. It's just going over the industrial ethernet. I wonder if TSEND/TRCV is also asynchronous. I rather have a function that is synchronous.
Tiaportalia Posts: 18 Rating: (0)
Suggestion To thank Quote Answer

1/16/2014 12:18 PM	Rate (1)
Fafner Silver Member Joined: 3/20/2013 Last visit: 3/21/2025 Posts: 676 Rating: (44)	The table shows your possibilites to communicate between two S7-300. Therefore it lists exactly the hardware on both sides (CPU w/o CP to CPU w CP 343-1 Lean, CPU w/o CP to CPU w or w/o [...] ) You are searching for CPU <--> CPU, no CP. That means you have the options (1), (3) and (2). They are all asynchronous which means that the communication can last longer then one cycle. There is also a software product for software redundancy (which you are trying to implement?). Perhaps you want to implement this software package? do you already know how many data you want to exchange?
	Last edited by: Fafner at: 1/16/2014 12:20 PM Best Regards, Fafner
Suggestion To thank Quote Answer
This contribution was helpful to 1 thankful Users Tiaportalia

1/16/2014 8:09 PM	Rate (0)
Tiaportalia Posts: 18 Rating: (0)	I didn't knew that there was this kind of software. Nice to know for the future. Because i didn't knew you could make the 300 series redundant. Only the 400. But the IO isn't the same on both sides. And on the slave side is a part of the machine that is "essential" for working. The Master PLC has "nice to have" features. But i think i now know what to implement. Also for experience i think Tsend/Trcv will do the job fine. PLC1: PLC2: OB100 -> TConnect OB100: -> Tconnect OB1 -> Trcv (id1?) OB1 -> Tsend (id1?) OB1 -> Tsend (id2?) OB1-> Trcv(id2?) But with Tia portal(v12). I can't get a TCP Connection to establish. I have attached a screenshot of this problem. First i made network connection between both 300 PLC's. Then you need to make a TCP Connection on top of it. But for some reason it doesn't work. I wonder if this is a bug or is it just me? :) --------- Edit: Oke i now understand it doesn't work like this. No need for making such connection. It will make it in OB1. There is also a Wizard when you place the Tconn block. There you make the connection. And i found a great example that probably also works great for S7-300, even it is an S7-1500 Example.... Here is the link:https://support.automation.siemens.com/WW/llisapi.dll?query=TCON&func=cslib.cssearch&content=adsearch%2Fadsearch.aspx&lang=en&siteid=cseus&objaction=cssearch&searchinprim=0&nodeid0=41886031 Attachment TCPConnectNotWorking.jpg (178 Downloads)
Tiaportalia Posts: 18 Rating: (0)	Last edited by: Tiaportalia at: 1/16/2014 8:42 PM
Suggestion To thank Quote Answer

1/17/2014 7:51 AM	Rate (0)
Fafner Silver Member Joined: 3/20/2013 Last visit: 3/21/2025 Posts: 676 Rating: (44)	sounds like you got it: yes if you use the TCON, ... ("open user communication") you do not have to configure a connection in the network view. The TCON establishes the connection. one short note to the 300 software redundancy: i guess you know that it is of course not the same thing as a 400H system.
	Best Regards, Fafner
Suggestion To thank Quote Answer

1/17/2014 8:31 AM	Rate (0)
Tiaportalia Posts: 18 Rating: (0)	Well thank you for helping me. :) Or atleast to get me in the right direction.. With Tsend i do get a whole set of new ideas.. :) Connect to Anything with a TCP connection.
Tiaportalia Posts: 18 Rating: (0)
Suggestion To thank Quote Answer
This contribution was helpful to 1 thankful Users Fafner

|

Share this page:

Share this page on...

Follow us on