Specifications
Description Units Minimum Maximum Comment
Allowed voltage at pin Vdc 0 36
Frequency range Hz 0 10000 In steps of 1 Hz.
Maximum discernable voltage (high
range)
Vdc 35.3 36 36 Vdc is typical.
Maximum discernable voltage
(middle range)
Vdc 5.67 5.83 5.75 Vdc is typical.
Maximum discernable voltage (low
range)
Vdc 0.440 0.456 0.448 Vdc is typical.
Minimum discernable voltage Vdc 0 0.08
Precision (high range) mV – – 36.5
Worst case error (high range) mV – – 614
Precision (middle range) mV – – 5.62
Worst case error (middle range) mV – – 75
Precision (low range) µ
V
– – 438
Worst case error (low range) mV – – 7.39
Input impedance (pulled to 5 Vdc or
ground, middle and low range)
kΩ 13.9 14.3
Input impedance (pulled to 2.5 Vdc
middle and low range)
kΩ 7.17 7.37
Input impedance (no pull ups,
middle and low range)
kΩ 230 236
Input impedance (pulled to 5 Vdc or
ground, high range)
kΩ 10.3 10.7
Input impedance (pulled to 2.5 Vdc
high range)
kΩ 6.07 6.27
I
nput impedance (no pull ups, high
range)
kΩ 36.4 38.4
This table shows the rising and falling thresholds when the input is used as a digital or frequency input.
Specifications
Description Units Minimum Maximum Comment
Rising voltage threshold (high
range)
Vdc – – – – It is inadvisable to use the high range
option when configuring the input as
a digital or frequency input.
Falling voltage threshold (high
range)
Vdc – – – – It is inadvisable to use the high range
option when configuring the input as
a digital or frequency input.
Rising voltage threshold (middle
range)
Vdc 2.85 4.03 A digital input is guaranteed to be
read as high if the voltage is greater
than 4.03 Vdc. These numbers also
apply to frequency.
Falling voltage threshold (middle
range)
Vdc 1.15 2.59 A digital input is guaranteed to be
read as low if the voltage is less than
Technical Information PLUS+1® Controller Family
Inputs/Outputs Types and Specifications
520L0719 • Rev PB • Feb 2014 13
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