Out of interest, how are you connected to the modbus unit? Modbus RTU is either RS232 or RS485 (Rs485 is either 2 wire or 4 wire), which of these 3 options have you used? Do you have a serial converter attached to the RevPi core? Are you sure the slave address (in "Extended data" is correct?

I've found with Modbus, one company's idea of Modbus addressing can be quite different from anothers. I'd start at 0 then try 1 (some companies start at 1, oddly), then try multiples of 10, ie 1000 (or 1001), 10000 (or 10001) until you find an agreement. Some company's implementation don't support s...

Is there a document (or documents) which contains details of what all the LEDs do on RevPi Modules? I can't seem to find them. I've worked out these for the DIO module: -----------------------------------------------------------------------------------------------------------------------------------...

Make sure you have all green LEDs. If you have some red LEDs on your DI or DIO module, then your power is not wired correctly. The example above, also assumed that Pictory has setup the tags like in the example - on my module it chose different tags. This will generate exceptions in the python code....

(continued..) You also need to set extended data (right click on your RevPi7) Setup a read or write (in data direction). Choose your memory area (I'd recommend DBs) Select your DB start address (eg 20 means DB20) Set your start databyte (0 means DBB0) Set your "number/size" - note that thi...

You set the following values in RevPi7 ------------------------------------------------ MEM PLC_IP "192.168.0.99" (put the IP address of the S7-1200 PLC in here) MEM Local_TSAP "0" MEM Remote_TSAP "0" (while you may read that the TSAPs have to be unique, internally this...

How many RevPi7s can i run on a single RevPi core?

Did you get an answer to this?
If so, how do you do it?

Can anyone give me some hints as to the advantages and disadvantages of each of the (many) IOT software systems you could place on the RevPi please? I'd like to benefit from the experience of other users if possible. I've looked at Procon-Web but it seems quite badly thought out (for example, supply...