Digital/Analog/Resistance/4-20 Ma Current (Din/Ain/Resin/Crntin) - Danfoss PLUS+1 SC0XX-1 Series Technical Information

Technical Information
PLUS+1 SC0XX-1XX Controller Family
Inputs
Specifications (continued)
Description
Input impedance (pulled to 2.5 Vdc, low range)
Input impedance (no pull ups, low range)
Input impedance (pulled to 5 Vdc or ground, middle range)
Input impedance (pulled to 2.5 Vdc middle range)
Input impedance (no pull ups, middle range)
Input impedance (pulled to 5 Vdc or ground, high range)
Input impedance (pulled to 2.5 Vdc high range)
Input impedance (no pull ups, high range)
Specifications
Description
Rising voltage threshold (high range)
Falling voltage threshold (high range)
Rising voltage threshold (middle range)
Falling voltage threshold (middle range)
Rising voltage threshold (low range)
Falling voltage threshold (low range)

Digital/Analog/Resistance/4-20 mA Current (DIN/AIN/ResIN/CrntIN)

10 | © Danfoss | June 2016
This table shows the rising and falling thresholds when the input is used as a frequency input.
Units Minimum
Vdc 11.83
Vdc 5.61
Vdc 1.78
Vdc 0.84
Vdc 0.11
Vdc 0.04
If the frequency goes to zero, the data will not decay over time, it will be updated once a new pulse is
seen, or times out. It is possible to monitor the count of pulses to know when the frequency reading is
updated.
When a SC Controller input pin is configured as a resistance/rheostat/temp sensor input, the device will
provide up to 3.76 mA current to an external load (RL) which then can be measured. The equation for
relating AD counts to a given load is: AD counts = (30996*RL) / (RL + 1322). This calculation is solved
internally and the ohms value is available for the programmer. The following Rheostat inputs chart shows
the relationship between AD counts and load resistance in ohms.
Rheostat inputs chart
30000
25000
20000
15000
10000
5000
0
0 1000 2000 3000
Units Minimum
kΩ 7.2
kΩ 230
kΩ 13.9
kΩ 7.2
kΩ 230
kΩ 13
kΩ 6.9
kΩ 108
Maximum Comment
26.55 Voltage required for frequency input to read high.
18.89 Voltage required for frequency input to read low.
3.92 Voltage required for frequency input to read high.
2.79 Voltage required for frequency input to read low.
0.30 Voltage required for frequency input to read high.
0.22 Voltage required for frequency input to read low.
4000 5000 6000 7000 8000
Load Resistance (Ω)
Maximum Comment
7.4
236
14.3
7.4
236
13.4
7.1
112
9000 10000
P200 083
L1415500 | BC00000235en-US0201