S7 200 Modbus Slave Library Download

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The S7-200 Modbus Protocol is for slave status only. If your inverter is a siemens MM420 or 440, you can use the USS protocol from the same library to control it. Hope this herlps, Daniel Chartier. Using the Modbus Master Protocol Library (v1.2). With the Modbus Master Protocol instructions, you can configure the S7-200 to act as a Modbus RTU master device and communicate to one or more Modbus slave devices. Library) and the Modbus slave devices. Caution: Interconnecting equipment with different reference potentials can cause.

I have seen a few posts lately on MODBUS so I thought I might post what I use with arduino. The library I use is located here: I have multiple slaves running.

I use the code posted below on ALL of them, all I change is the slave ID. I keep all the pins the same, that way when I upload this code onto ANY arduino, it works. You should not have to change ANYTHING ELSE! I also have this running over Xbee's through a Digi Connectport X4, which converts it to TCP. I then use Mango M2M as my SCADA package. I can now get my Analog and digital data from anywhere in the world, or open and close my roller doors, anything. I can even write Analog values.

All my logic is done in Mango. You could probably do a mesh with a Xbee as a coordinator on a PC, transmitting to all the MODBUS slaves,(leave all destination addresses as zero's and set the slave Xbees to routers), but have not tried it because I have an X4 I DO NOT think you need to use RS485 for this. Just connect a PC straight up to your freshly programmed arduino, and run some sort of MODBUS master or test software, using the register number as listed in the code. Remember, in the SCADA software do not use the whole address number, for instance, to access pin 2, you would be reading a COIL on Slave 1 at address 2, not address 10002. Some SCADA packages use ZERO offsets, so subtract 1, so the address for pin 2 would be 1.

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