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Hello! I am new here. I have an object with such structure: Building 1 = Eka1 = E1: V570 - IP address 192.168.186.3 , PLC name = PLC1, can id #1 V120 - can id#2 V120 - can id#3 V120 - can id#4 V120 - can id#5 V120 - can id#6 V120 - can id#7 Building 2 = Eka2 =E2: V350 - IP address 192.168.186.4 , PLC name = PLC2, can id #1 V120 - can id#2 V120 - can id#3 Building 3 = Izolators = Izo: V350 - IP address 192.168.186.5 , PLC name = PLC3, can id #1 V120 - can id#2 V120 - can id#3 V120 - can id#4 Data between V120 and V350, or V120 and V570 sends with Unican. In most cases there is no problems with this transfers, But week ago started problems with UDP_RAW sending between E2 V350 and E1 V570, and between Izo V350 and E1 V570. Here is image of VisiLogic programm: in program i try to UDP_RAW scan IP address 192.168.186.4 (start vector MI1170), but when i online connect to V570 he shows IP address 192.168.186.5?! WHO changes number in MI1173 (i put 4 here , but in online mode 5!!!), if i use this MI only one time in a programm... I checked SB141-146 in Izo_V350 , there was "1" in this system bits. I checked SB141-146 in E1 V570 , there was "1" in this system bits. I think E1 , E2 and Izo connected to a single network with switch. Also PC with 192.168.186.2 IP address connected to this netowrk. I can ping 192.168.186.3, 192.168.186.4, 192.168.186.5 from PC in command line. What i should check next? Ty for advices. P.S. links to images http://s020.radikal.ru/i716/1402/7b/6371416aeafb.png http://s019.radikal.ru/i635/1402/db/fd7f6e267643.png