12VDC for Limit and Home Signals for PCI 7334 using UMI-7764

Can 12VDC be used for Limit and Home Signals for PCI 7334 using UMI-7764.
Can the UMI 7764 be damaged if over voltage is supplied to it. If so can it be repaired or it has to replaced.

Specifications for the Limit Switchs (home, forward, reverse, etc) is
determined by the specifications of your NI motion controller PCI
board. The UMI functions only as a pass through and breakout for the
board .
The valid limit swich voltage for the PCI-7334 is 0 - 5 V. You will have to divide down a 12 V input before running it to
the UMI and to your board. The 3.3k pull up resistor is only used to
pull floating voltages to TTL levels and does not protect for high
voltage signals.
Please note that the UMI-7774 provides optical isolation for limit switches and extended input levels (e. g. limit switch voltages: On = 3.5 to 30 V, Off = 0 to 2 V).
Best regards,
Jochen Klier
National Instruments Germany

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