Re: [CAD_CAM_EDM_DRO] VOLTAGE APPLIED TO PLC INPUTS

Don't do that.

Never tie a motor lead to a PLC input, regardless of PLC input voltage.

Use a dedicated contact from your motor contactor, or better yet, a speed
switch.

Beth



At 04:15 PM 1/21/04, john_glynn57 wrote:

>Is there a limit to the voltage that I apply to a PLC input. I wish
>to
>detect when the main spindle of my machine is on and need to know if
>it is ok to feed one of the input phases to the motor to the PLC
>input directly .
>
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