Vision & Samba PLC + HMI Controllers & VisiLogic Software
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All the above from Gabriel and Flex. Ditto from me on the 232 - 485 adapter....huh? This may not work as expected given it's likely designed to be attached to a PC and run with specific drivers. Do you know that the 350 can do 485 all on it's own? If you don't, read about it in the install manual for the unit, with the illustrations of the Controller Port & Jumpers under the Pinouts heading. And the associated question with using the 232 port is how are you connecting to the 350 to monitor things etc via Visilogic? Does it have an ethernet card fitted? If not, strongly suggest to do it this way, then your serial port is only for 485 use. But to truly answer your questions, we need to see the insides of the Modbus Config blocks for both units. -
By Gabriel Franco · Posted
I would check: 1. Terminal resistors, only at the ends of the network. 2. Comms parameters, baud and so on. 3. Register numbers. 4. Delay time between readings of each slave. -
Not an answer to your question, but why are you using a RS232 to RS485 converter? Also, have you tried connecting only the V700 to the V350 without the others? -
Try downloading a blank project, perform Initialize & Reset, then try your project again. Also, make sure any and all HMI screens in your project are called with transition contacts only.
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Good afternoon. We have V 350 (Modbus Master) and V 700 (Modbus Slave 2). Modbus works on the RS 485 line and there are other Modbus devices (Slave) on the line. Master works well with Modbus Slave 1 device. But does not want to work with Modbus Slave 2 (V 700). At the same time, when monitoring data on the RS 485 line, there are no problems - slave 2 will respond to the master. I checked the settings of the ports V 700 and V 350. I tried to connect a laptop with Modbus slave simulator instead of V 700 - everything works. Tried to get modbus data from V 700 using laptop - everything works fine. For some reason, the V 350 and V 700 do not want to work with each other. Has anyone experienced something similar?
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