PiXtend eIO Hardware Manual
6.6. Operation with 12V Supply Voltage
PiXtend eIO devices are designed for supply voltages of nominal 24 V DC (19 - 30 V).
Thus, the devices comply with the industry standard. Power supplies with 24 V DC output
voltage are available worldwide in countless versions - from power adapters for home or
office environments to top hat rail power supplies for installation in control cabinets.
Nevertheless, in some applications it may be of interest to operate the devices also with 12
V DC. As an example in the car, outdoor area and island operation.
The supply of 12 V is possible in principle, but brings with it restrictions. These limitations
are discussed below. Thus, you can decide for your application whether you can use
PiXtend eIO devices with 12 V or not.
Effects on the overall system (all PiXtend eIO devices):
•
Energy reserve of 10 ms according to IEC 61131-2 is not given anymore
Effects on analog outputs (PiXtend eIO Analog One):
•
Analog voltage outputs have a maximum load of 3 kΩ or a maximum output current
of 3 mA
•
Analog current outputs can drive a maximum load of 250 Ω and the wire break
detection is without function
The reduced supply voltage to 12 V DC has no effect on digital inputs and outputs
(PiXtend eIO Digital One), as well as on the analog inputs (PiXtend eIO Analog One).
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