VS Series Helium Mass Spectrometer Leak Detectors
1-26
DRAFT 4/
23/15
➃ I/O Connector A 25-pin female D-sub connector to interface with an external PLC
via a parallel cable.
Inputs:
❑ Four level inputs: optically isolated, (+5 to+24) VDC.
❑ Four momentary inputs: optically isolated, (+5 to+24) VDC,
requires 200 ms pulse width.
All inputs are opto-isolator LEDs with a series 3300 Ohm resistor.
Outputs:
❑ Eight optically isolated emitter followers with a 10 Ohm
series resistor, 14 mA max drive current, +24VDC max.
Power:
❑ An external power supply is supplied by the user.
A detailed summary of information related to I/O pin identifications
is provided in Table A-6 on page A-14.
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