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S7 - SM 322 DO 32 Channel DO card

Created by: annupalani at: 11/1/2010 8:25 AM (6 Replies)

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11/1/2010 8:25 AM	Rate (0)
annupalani Posts: 26 Rating: (2)	Dear Experts In one of our S7 System even though the Program doesnt enrgise the DO Channel we observe the few Channel LED's are ON(Green Colour). This we have blocked entire program to make sure the program is not executing any logic to energis the outputs,but still we observe few Channel LED's are ON in DO card. Kindly advice / suggest for solving the above said issue. Thanks BR Palani S
annupalani Posts: 26 Rating: (2)
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11/1/2010 8:36 AM	Rate (0)
fritz Diamond Expert Joined: 10/7/2005 Last visit: 9/11/2024 Posts: 3020 Rating: (1054)	annupalani ... we have blocked entire program to make sure the program is not executing any logic to energis the outputs,but still we observe few Channel LED's are ON in DO card. Hello annupalani If you do not write to the DQ's anymore in your program, they will remain in their laststate. Can you check in Variable Table (VAT) if the DQ's are 1? If so, you can now also reset them to 0 in the VAT. If the DQ's are all 0 in the VAT, I suspect an issue eitherthe DQ card and/or with the wiring. I hope this helps and pelase let us know the outcome.
	Cheers fritz The advice and opinion given in this thread is that of the author and does not necessarily reflect the views of I S Systems Pty Limited. To find out how I S Systems can help you with your automation needs please visit www.issystems.com.au.
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11/1/2010 8:38 AM	Rate (0)
annupalani Posts: 26 Rating: (2)	Hi I have checked it in HW Online monotor itself & also in VAT ....in both they are showing zero only...but still few Channel LED'sin DO Cardare ON. Thanks BR Palani S
annupalani Posts: 26 Rating: (2)
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11/1/2010 8:40 AM	Rate (0)
annupalani Posts: 26 Rating: (2)	Hi Fritz Thanks for your reply. I have checked it in HW Online monotor itself & also in VAT ....in both they are showing zero only...but still few Channel LED'sin DO Cardare ON. Thanks BR Palani S
annupalani Posts: 26 Rating: (2)
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11/1/2010 7:18 PM	Rate (0)
Ben Rad Bronze Member Joined: 7/28/2010 Last visit: 8/31/2024 Posts: 184 Rating: (11)	Palani, What is the type of DO card? Regards, Behnam www.sigmaprocess.ca

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11/2/2010 12:48 PM	Rate (0)
annupalani Posts: 26 Rating: (2)	Hi Behnam Plz. note the card model: 6ES7322 1BL00 0AA0 Thanks BR Palani S
annupalani Posts: 26 Rating: (2)
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11/2/2010 1:22 PM	Rate (0)
Ben Rad Bronze Member Joined: 7/28/2010 Last visit: 8/31/2024 Posts: 184 Rating: (11)	Palani, I have attached the Block Diagram of Digital Output Card. If the output is not energized, the only way to have LED on is that the Zener Diode for that channel is not working properly which let 24VDC directly on the resistor. Have you replaced the cardwith a spare one? Regards, Behnam www.sigmaprocess.ca Attachment S7-300 DO Card.pdf (158 Downloads)

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