Vision & Samba PLC + HMI Controllers & VisiLogic Software
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A lot of things have changed since then. On Feb 20187, when UniLogic 1.23.25 was released, it first introduced the Layers, and Elements Grouping -
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I vvork vvith vision 1210 , and I have expansion module like iodi16-to16. On input I52 I 53 I have high speed input. on this input i vvire one pnp or npn sensor ,I have disk vvith 12 pulses per revolution , I need to calculate rpm and this information is feedback for PID. -
Hi Kevin I would suggest that you call the read and write sub-routines in your program continuously. Conditional calling of sub-routines sometimes gives unexpected results. Try increasing the time on TD0, everything is trying to happen too fast. On you RHR 3 block you are reading 2 values and sending them to MI3. This will store one value in MI3 and the second in MI4. However you are using MI4 in the same block to show the status. Be careful of this, if you are reading several values you must allow enough room to store them. Visilogic will not automatically reserve the space for you. I you are going to read more than one value try to do it on one read. for example if you need address 1, 5 and 7 on the device, it is better to read 1 and set a length of 7 than to try to read using 3 separate reads. It works out much faster and you can just ignore what you don't need. When reading and writing in MODBUS try to set up a sequence. Set a bit perform a read or write using a positive transition contact of the bit and use this to set the bit for the next action. Continue this to complete all the read/writes and at the end reset every thing and start again. Start read - Set MB1 Positive transition MB1 - Read first piece of data and set MB 2 Positive transition MB2 - Read second piece of data and set MB 3 Positive transition MB3 - Write first piece of data and set MB 4 ETC. when all data is pooled reset all MB and start again. You are writing the value to MI6 in the modbus data block, did you intend to display this on the write screen? Regards Denis -
Hi, When I make a sending message to the register I read before. Then the servo driver send a alarm to his HMI( AL019). Normaly I had the same communication parameters for send a message or read a answer. I do not understand why the servo driver react like this. I give you my code. Thank you Kévin test RS485.vlp
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