Read Write Data from Siemens PLC S7-200 on Serial Port

[GetMayurVBS]

xmt s7-200

How to connect Siemens PLC S7-200 on Serial Port without any third party Drivers or APIs?


Please tell me About Modbus Protocol or Profibus Protocol for S7-200.



Regards


Mayur

 

[micropar]

s7-200 xmt

Hi mayur,

You can use Open Serial Protocol features of S7-200 PLC. I don't remember now exactly, but it works with XMRT and RXT mnemonics of Statement List language.

Go through its System Manual and you will find examples there.

Regards,
--micropar--

 

[tvthang]

how to read data siemens from plc using .net

HI,
If you want to transmit/receive data to or from another equipment you should have a cable (PPI cable, RS232-RS485 cable).
In PLC lader, you init SMB30 cell with rev./trans configure, for example: value 16#09 in SMB30: baud rate: 9600bps, 8 bit data, 1 stop bit, no parity
after that, you using XMT for transmit (using help on program) or interrupt 8 to receive data
It is easy for you to do this, good luck!

 

[auto_mitch]

plc s7-200

Check at S7-200 documentation for freeport configuration. Take a look at special memory bytes SMB30 for Port 0 and SMB130 for Port 1. After port configuration you can use the XMT and RCV function to send and receive a number of data bytes. Check these functions how they work, in help.