Reading data from PLC S7-222

[Guest [Beer]]

Hey ! I would like to read data from PLC (S7-222 DC/DC/DC 24V). I made an application (using Borland Delphi) which is able to communicate with PLC. I mean I have learnt how to send characters to PLC and receive some ASCII string back to PLC (reply) . Now I would like to read data from PLC. For example: I specify an address and DataType. Then I should send packet (request) to PLC and it should reply with another packet (value) For example: value := ReadPLCValue(Address, DataType); Value := ReadPLCValue('VB100', Byte); Btw: I would like to make my own OPC server. Thanks for helping [beer] Edited July 23, 2004 by [Beer]

[Crossbow]

Personally, I'd not reinvent the wheel. The new S7-200 OPC Server is easy to work with, and rather inexpensive. I just use the OPC servers from the various PLC manufacturers. But then the last time I wrote code for a computer was a bit of C and a bunch of COBOL and RPG in college.

[Guest the_coco]

Hello Chris, I'm just starting to develop an application with S7-222 and the only way I found to connected my VBA application to my PLC is MicroComputing from Siemens. Could you give me the name of its new S7-200 OPC server not expensive. thanks in advance Nicolas ------------------------------------------------ french Student and PLC beginner

[Crossbow]

The new package is called S7-200 PC Access, and in the US it lists for $295. Part number 6ES78402CC010YX0.

[Guest M. de Vries]

Hello, You can use the port of an s7-200 cpu as a serial ascii port to transmit en receive data. To do this use the system flag SM30.0, look up in ref. manual. With the TERM en RUN switch you can change back to normal PPI mode.

[Guest the_coco]

Thanks for your answer CHRIS