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Digital inputs don't change states

Created by: AutoGen_3089434 at: 2/15/2024 12:11 PM (5 Replies)

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2/15/2024 12:11 PM	Rate (0)
AutoGen_3089434 Experienced Member Joined: 5/28/2018 Last visit: 7/31/2025 Posts: 93 Rating: (4)	Hello, I use CU240E-2 PN. For some reason I get only DI4 signal state. All other DIs remain low even if they get high signal. Any ideas? Thanks! Attachment CU240 inputs.png (383 Downloads)
	Last edited by: The Helping Hand at: 02/16/2024 09:15:24 Text formatting optimized
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2/15/2024 3:24 PM	Rate (0)
Tractor Gold Expert Joined: 3/27/2008 Last visit: 9/14/2025 Posts: 1216 Rating: (148)	Do you have a link, 28, 69, 34; must be linked together? Tractor
	Tractor
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2/15/2024 4:34 PM	Rate (0)
AutoGen_3089434 Experienced Member Joined: 5/28/2018 Last visit: 7/31/2025 Posts: 93 Rating: (4)	Hi, Actually I didn't bridged 34. I link as in the attached pic. Is this may be the problem? Attachment cu240_2.png (314 Downloads)
	Last edited by: The Helping Hand at: 02/16/2024 09:15:50 Text formatting optimized
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2/15/2024 5:43 PM	Rate (0)
Tractor Gold Expert Joined: 3/27/2008 Last visit: 9/14/2025 Posts: 1216 Rating: (148)	Hi terminals 6/8/17 are activated by grounding terminal 34 terminals 1/9/12/26 are activated by grounding terminal 28 this may seem odd but it is a useful method of providing terminals either active high or active low. Tractor
	Tractor
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This contribution was helpful to 1 thankful Users AutoGen_3089434

2/15/2024 11:37 PM	Rate (0)
Baldomero Member Joined: 10/2/2021 Last visit: 8/28/2024 Posts: 3 Rating: (0)	U need to link terminals 28, 69 and 34. Those are the coms of the Digital Inputs. Its weird, because you are saying that just the DI4 turns on. And know htat im gonna be obvious, but you need to be sure that there is positive voltage at the terminals of the DI. Are you using TIA Portal? maybe you shold try with the Software Starter.

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This contribution was helpful to 1 thankful Users AutoGen_3089434

2/16/2024 8:15 AM	Rate (0)
AutoGen_3089434 Experienced Member Joined: 5/28/2018 Last visit: 7/31/2025 Posts: 93 Rating: (4)	Hi, I didn't link 34. That's probably the problem (I'll try to link it next week). I checked the voltage. I tried to set positive DI3, DI4 and DI5, and only DI4 changed to high. Now I understand that DI4 has 69 (DI com1) as reference, and DI3 and DI5 have 34 (DI com2) as reference. So that must be the reason. Thanks!
	Last edited by: The Helping Hand at: 02/16/2024 09:16:18 Text formatting optimized
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