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MODBUS TPC/IP and routing

Created by: georgioh at: 9/16/2013 10:38 AM (7 Replies)

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9/16/2013 10:38 AM	Rate (0)
georgioh Regular Member Joined: 12/11/2007 Last visit: 9/30/2024 Posts: 10 Rating: (1)	Hi! We need to establish communication between IM151-8 PN/DP as a passive server and GEFANUC 9030 as active client. Our IM151-8 is connected to the net 192.168.101.x and GEFANUC is connected to completely different net (10.15.16.x). Between both nets are 2 CISCO routers. I was told, that on routers are no restriction settings (firewall, ports..). Ping works as well, however I cannot establish the connection. I've got an error A100 (Conn_Time and Recv_Time exceeded) and the parameter Conn_Established is in the state False. I tried to increase both times, but the result was the same.In configuration I set just IP address without subnet mask and gateway. Does MODBUS TCP support routing to other nets or the both devices must be connected to the same net? Thx for reply Regards georgioh

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9/16/2013 11:56 AM	Rate (0)
Pierre_B Posts: 129 Rating: (0)	Hi, which entries do you have in the parameter db of the modbus block? Can you attach the db or a screenshot here? I assume the connection parameters are not correct. Pierre
Pierre_B Posts: 129 Rating: (0)
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9/16/2013 1:24 PM	Rate (0)
Kaulquappe Posts: 3093 Rating: (323)	Hello Georgioh, ModbusTCP does not support routing. Both device should be connected to the same net or the router must change the IP address from 192.x.x.x to 10.x.x.x. Regards, Kaulquappe
Kaulquappe Posts: 3093 Rating: (323)
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This contribution was helpful to 1 thankful Users f.hamza

9/16/2013 1:35 PM	Rate (0)
georgioh Regular Member Joined: 12/11/2007 Last visit: 9/30/2024 Posts: 10 Rating: (1)	Thank u very much, Kaulquappe.

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9/16/2013 2:27 PM	Rate (0)
Pierre_B Posts: 129 Rating: (0)	Hi, I think it's possible. If you define your router in hw config, then a TCP connection can be established. And the modbus protocol only uses this TCP connection. Please attach the parameter db to find a possible parameterization error. Pierre
Pierre_B Posts: 129 Rating: (0)
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9/16/2013 2:45 PM	Rate (0)
Sakura Silver Member Joined: 9/22/2010 Last visit: 7/25/2024 Posts: 225 Rating: (28)	Pierre should be right with his statement. By setting up the router in the HW config, it should be possible to establish the connecting. The routing is not a part of the MODBUS TCP protocol, but of the HW. Regards Sakura

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9/19/2013 3:20 PM	Rate (0)
georgioh Regular Member Joined: 12/11/2007 Last visit: 9/30/2024 Posts: 10 Rating: (1)	Hi! Well, good idea, however I'm afraid, in this case it's not possible, because the routing is a bit more complicated . Between these 2 devices are actually 2 CISCO routers, so .... Anyway we found other solution with OPC and it works as well. And thx again.

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This contribution was helpful to 1 thankful Users Kaulquappe

3/4/2015 2:54 PM	Rate (0)
Min_Moderator Platinum Member Joined: 9/3/2014 Last visit: 3/13/2019 Posts: 4766 Rating: (122)	New question published by rezajan55 is split to a separate thread with the subject S7 station could not pinged by server. Best regards Min_Moderator

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