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Modbus TCP with emerson gas chromatograph not working

Created by: christian.vanputten at: 6/8/2015 9:24 AM (5 Replies)

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6/8/2015 9:24 AM	Rate (0)
christian.vanputten Posts: 8 Rating: (0)	hello , i am trying to get an modbus connection working with TCP . as an master. my slave is an Emerson (Daniel) 2350A GC (gas chromatograph) i am using an CPU 1512sp-1 PN with Tiaportal V13 sp1 latest update. and the Block MB_SERVER . (V3.0 - instructions V4.0) my DB for "MB_hold_register input", i had to tick off the "optimized block acces" setting to get it connected... " with an Modbus tool in windows i can connect with the Slave and see the data. only strange thing is that i configured the Slave to start on 47001 adress (holding) and i have to set my tool to start at 47002. to get it working . but the data isnt shifted. " the slave sends out 11 reals , and the Indianness is differnt with siemens (i know for a fact) so maybe thats caused the offset for 1 register. ive added an word document with all the screenshots how ive programmed in tiaportal and how i configered the slave (GC) and the windows tool. hopefully you can point me to a setting maybe in an DB that i made wrong or did not make at all. I've used an example programm from this forum to get started. ps i know for a fact that the Emerson GC is a different ENDIAN so the Reals get word swapped when i receive them . maybe i have to do somthing with that . with my parameters. i know how te swap them after i get the data btw... thanks in advance. christian van putten. Attachment MB_SERVER CONNECTION EMERSON GC.docx (286 Downloads)
christian.vanputten Posts: 8 Rating: (0)	Last edited by: christian.vanputten at: 6/8/2015 9:38:05 AM
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6/8/2015 9:38 AM	Rate (0)
Gwawl Experienced Member Joined: 10/21/2011 Last visit: 7/15/2021 Posts: 57 Rating: (17)	Hi, when your GC is the server/slave then you need the MB_CLIENT function block on your S7-1500. About the adress issue: " with an Modbus tool in windows i can connect with the Slave and see the data. only strange thing is that i configured the Slave to start on 47001 adress (holding) and i have to set my tool to start at 47002. to get it working . but the data isnt shifted. " Some devices have a offset of 1, some devices don't have this offset. This means that the adress range can start at 0(40000) or at 1(40001). When two devices with different start adresses communicate with each other you get this offset of 1.

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6/8/2015 9:41 AM	Rate (0)
christian.vanputten Posts: 8 Rating: (0)	Hi , thanks for the info . I will try that now , if i get it working i will let it know here.
christian.vanputten Posts: 8 Rating: (0)
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6/8/2015 11:32 AM	Rate (0)
christian.vanputten Posts: 8 Rating: (0)	Ive made the MB Client now , but the block status is getting error 8200 Error 8200 : A different Modbus request is currently being processed via the port. Another instance of MB_CLIENT with the same connection parameters is processing an existing Modbus request. and after the Block Timed out the connection i get error 80c8 but thats because of the above i guess. No response of the server in the defined period. Check the connection to the Modbus server. This error is only reported on completion of the configured repeated attempts. If the "MB_CLIENT" instruction does not receive an answer with the originally transferred transaction ID (see static MB_TRANSACTION_ID tag) within the defined period, this error code is output. So my problem seems to be that the port is beeing used . how do i find out by what ? and does it mean the TCP port at my PLC or at the 3rd party device? I cant change the Port number in the Slave . does anybody know how the Slave get an Port assigned by the master to reply on ? or does it happen on the same port 502? does anybody knows what it meas , or with what it relates to?
christian.vanputten Posts: 8 Rating: (0)	Last edited by: christian.vanputten at: 6/8/2015 12:42:30 PM
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6/8/2015 1:18 PM	Rate (0)
christian.vanputten Posts: 8 Rating: (0)	thanks again for your help GWAWL !!! youve pushed me in the right direction , thanks for that. in the END , the thing went wrong with the communication with the Slave: in the slave i had to chose an Comm ID . after a bit of fiddling i found out that i had to put the same number in the MB_CLIENT:DB at parameter MB_UNIT_ID. SO IT IS SOLVED !!!
christian.vanputten Posts: 8 Rating: (0)
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This contribution was helpful to 1 thankful Users Min_Moderator

4/27/2017 11:37 PM	Rate (0)
carv Posts: 1 Rating: (0)	Excelente!! me sirvió mucho. tambien estuve, dando muchas vueltas, sin saber que debía colocar el ID igual para el bloque de instancia y el bloque MB:UNIT_ID Nuevamente muchas gracias!! ----------------------------------------------------------------------------------------------------------- Translation by moderator: Excellent!! Served well for me. I was also doing a lot of laps, not knowing I had to put the same ID for the instance block and block MB: UNIT_ID Again thank you very much!!
carv Posts: 1 Rating: (0)	Last edited by: Min_Moderator at: 4/28/2017 1:52:06 PM Translation
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