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Connection MD720-3 and ET200S 1SI

Thread Starter: ziemson   Started: 3/27/2012 11:49 AM   Replies: 2

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  3/27/2012, 11:49 AM
ziemson
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I'm testing "SMS_Example" as in this link: http://support.automation.siemens.com/WW/view/en/25545680

I have a question about connection these modules. I think that the documentation is wrong, because they connect pin8 (ET200 1SI) with pin7 (MD720-3). What will be correct connection of these modules?

Part of this manual is in attachment.

Attachment: MD720-3_and_ET200S_1SI.jpg  (17 Downloads)
ziemson,
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  3/27/2012, 2:36 PM
UMENCHO
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Hello,

From where did you assume that connection is wrong?

Best regards,
Hristo Mihalev
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  3/27/2012, 2:55 PM
ziemson
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Because they connected pin8 (ET200 1SI) with pin7 (MD720-3). It seems to me that pin7 on MD720-3 is "RTS" signal, not "PE" like in this manual. 

I think that pin8 on ET200S 1SI should be connect with pin5 on MD720-3, because pin5 is "ground"signal. I'm wrong?

Best Regards
ziemson
ziemson,
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