All input pins
Digital input pins are not opto isolated and are internally pulled up to the external I/O +24 V supply by a 10 kΩ resistor.
To activate, the pin must be pulled 'low', below 3 V (e.g. machine I/O 0 V, pin 37 or 44).
To deactivate, the pin must be driven 'high', above 4.2 V (or open circuit).
CAUTION:
The input pins must not be driven above 24 V.
All output pins
All digital output pins have a 10 kΩ pull‐up resistor to the external I/O +24 V supply, these output pins are suitable for driving devices in the
range +5 V to +24 V and can sink a maximum current of 1 A. If this output is not required, then it should be left as an open circuit.
CAUTION:
The output pins are not suitable for direct connection to circuits operating above +24 V.
External I/O +24 V
The external I/O +24 V supply is provided to power external solenoids and solid state limit switches, this can supply a maximum current of 1
A. If higher current is required then a separate power supply must be used.
NOTE:
The machine I/O +24 V supply output is shared between the machine I/O connector and the configurable I/O connector.
SPA3-2 installation guide
www.renishaw.com
Issued 08 2020
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