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Augusto posted a topic in Vision & Samba PLC + HMI Controllers & VisiLogic SoftwareHello Everyone. Hello everyone I am having a problem with my Vision V350, in the company where I work there are two PLCs, a V350 and a V1210 that communicate by MODBUS. We have a screen that alerts us when a communication problem happen and when we check our V350 it shows us an error that is: O.S. (Stop Mode - Fatal Error) Enum: 0x00001740 IP: 0x00250000 00076A2C Ldr: 0x000000DE Desc: Undefined Opcode Some changes had been made to the program and then this error arose so it went back to the previous program, but the problem is still happening. Does anyone have any idea why this happens? By performing a reset of the equipment, the problem is solved momentarily but this is not recommended for our production.