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LOGO 8 Input Problem

Created by: Parick Frano at: 9/9/2016 5:02 PM (10 Replies)

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9/9/2016 5:02 PM	Rate (0)
Parick Frano Member Joined: 4/25/2014 Last visit: 5/15/2023 Posts: 11 Rating: (0)	I have a logo 8 standard with an 8 position expansion card. Program downloaded fine. I have several switches with 24VDC control voltage wired to them and the to the PLC inputs. Some maintained, some momentary. The PLC is simply not detecting any inputs. I ran diagnostics in comfort soft and all it came back with was no SD card. Any suggestions?

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9/9/2016 5:22 PM	Rate (0)
ixo65 Grandmaster-Expert Joined: 12/18/2014 Last visit: 12/13/2024 Posts: 34407 Rating: (4289)	Which color shows the LED on the expansions module? Red? Yellow? Or Green?

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9/9/2016 5:24 PM	Rate (0)
Parick Frano Member Joined: 4/25/2014 Last visit: 5/15/2023 Posts: 11 Rating: (0)	Green, unit is in Run and i can enter online test.

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9/9/2016 6:51 PM	Rate (0)
William_B Posts: 5225 Rating: (1197)	Hi. Maybe there is an electrical issue. Would it be possible for you to show us a photo of how the wiring has been done? Also.. did you confirm with a handheld multimeter the voltage that is given to the LOGO? w
William_B Posts: 5225 Rating: (1197)
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9/9/2016 7:18 PM	Rate (0)
Parick Frano Member Joined: 4/25/2014 Last visit: 5/15/2023 Posts: 11 Rating: (0)	Wiring is pretty straight forward. I have a 24VDC power supply. The 24VDC to top of various switches. Bottom of switch to PLC input. When switch is off i show no 24 power between input and negative terminal on power supply. When switch is on i show 24volt power between input terminal and 24vdc negative terminal. My logo runs off 120VAC and that is working and normal. I have confirmed continuuity of circuit with power off and also confirmed 24volt arriving to terminals with power supply on.

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9/9/2016 7:27 PM	Rate (0)
ixo65 Grandmaster-Expert Joined: 12/18/2014 Last visit: 12/13/2024 Posts: 34407 Rating: (4289)	With a Logo 230VAC you not make 24VDC on Input, only 115-230VAC on Inputs.

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9/9/2016 7:31 PM	Rate (0)
Parick Frano Member Joined: 4/25/2014 Last visit: 5/15/2023 Posts: 11 Rating: (0)	I got a logo 230RCE that runs off 120VAC. It says "input 8x AC/DC" right on it. Are you saying that input control voltage needs to be 120VAC for that model?

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9/9/2016 7:35 PM	Rate (0)
William_B Posts: 5225 Rating: (1197)	PatrickFrano I got a logo 230RCE that runs off 120VAC. It says "input 8x AC/DC" right on it. Are you saying that input control voltage needs to be 120VAC for that model? I for one cannot remember all the specs.... have you received some pamflet with the hardware? Maybe the specifications there could help?
William_B Posts: 5225 Rating: (1197)
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9/9/2016 7:43 PM	Rate (1)
ixo65 Grandmaster-Expert Joined: 12/18/2014 Last visit: 12/13/2024 Posts: 34407 Rating: (4289)	The exact specifications please refer to the attachment. Attachment LOGO! 8 Soft manual 0BA8 2014_06.pdf (208 Downloads)

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This contribution was helpful to 1 thankful Users William_B

9/9/2016 8:00 PM	Rate (0)
Parick Frano Member Joined: 4/25/2014 Last visit: 5/15/2023 Posts: 11 Rating: (0)	Thank you very much for your help guys, looks like I got some wiring to change. Have good weekend.

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This contribution was helpful to 1 thankful Users ixo65

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