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TOPIC: Isolated 24V IO wiring (M12 12 pin)

Isolated 24V IO wiring (M12 12 pin) 7 years 4 days ago #269

  • Phillips
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Hi-

Doing my first hardware/software implementation with a smart motor. While setting up hardware, could not find a specific reference to guide wiring of universal discrete inputs on optional isolated 24V IO. I followed the example given in the user guide on page 57 however this drawing is specific to the 7 standard IO (unisolated 0-5V). The inputs are wired through a NO switch to the 24VDC common and are non-responsive to button press. I believe my error was that these should be wired from the NO switch to +24VDC. Can you confirm?

Thx in advance
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Re: Isolated 24V IO wiring (M12 12 pin) 7 years 3 days ago #270

  • csearcy
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You are correct. The Isolated 24V I/O is sourcing, so the inputs will turn on when they see 24VDC.
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Re: Isolated 24V IO wiring (M12 12 pin) 7 years 3 days ago #272

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CS- thanks, reworked the cable assembly last night to expose an unused input and tested there- works perfectly. Reworked IOs of consequence and suddenly had a somewhat running application- now for the debug. Thanks very much for your confirmation. On a related note- do you know of a comprehensive set of documentation that reflects current hardware/software? (I'm now finding code differences in the user guide examples). Thx!!!
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Re: Isolated 24V IO wiring (M12 12 pin) 7 years 3 days ago #273

  • Phillips
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note: the term 'sourcing' here I find confusing- was taught that sourcing meant a +VDC supply was connected and that a DC common was required to complete the circuit- sinking is the opposite (common connected, need +VDC). Referenced NI last night to check and they agree, here's the link- digital.ni.com/public.nsf/allkb/a10122c6...5cfe86256b4c007491dd. Operated on memory and the drawing of the 5V IO which indeed shows a sourcing arrangement for the design of the cable assembly that was non-functional. My memory here and NI's input both indicate that this is a sinking input- how are you drawing the 'sourcing' conclusion? Bottom line the device is fully functional now and this is for my own re-education! Thx...
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Re: Isolated 24V IO wiring (M12 12 pin) 7 years 2 days ago #274

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You have a Class5 motor, so the users guide on the main page under Support is the one you need.
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Re: Isolated 24V IO wiring (M12 12 pin) 7 years 2 days ago #275

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The definitions of Sinking and Sourceing have been a long going debate between PLC manufacturers. I have always followed the rule that if the input turns on with plus voltage, then it is sourcing.
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