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S7-300 DO not giving any output signal

Created by: OLAMIX at: 12/21/2009 3:44 PM (10 Replies)

12/22/2009 3:06 PM	Rate (0)
Ammy Platinum Member Joined: 4/19/2008 Last visit: 9/3/2024 Posts: 1525 Rating: (159)	OLAMIX but i need to ask , why do we have to connect the 21 no terminal to the 24vdc and bla bla...... i need some light on that (from my understanding, the output needs some power source) Hi OLAMIX, http://support.automation.siemens.com/WW/view/en/8859629 on page no 181 you will find the reason why we have to connect the 24VDC on 21 no. Terminal.
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