Connecting a weight display using S7-200 MODBUS Master

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ESRAA

DEAR SIR

I HAVE PLC SIEMENS S7-200 CPU 226 HAS TWO COMMUNICATION PORTS 0&1 AND I HAVE SOFTWARE V4.0 MICROWIN STEP7 SP5 FOR PROGRAMMING AND I AM PROFESSIONAL IN PROGRAMING THIS MODEL.

I WANT TO KNOW how to connect two weighing display to port 0 of CPU 226 via modbus master library and read the indicated weight value of the display in my software v4.0 microwin step7 SP5 as a variable word (ex.vw100).

if this weighing indicators should have certain specifications to be adapted with v4.0 step 7? Is there a specific model I should purchase?

thank you
 
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