Rockwell Automation Allen-Bradley 1715-IF16 - Page 263

Rockwell Automation Publication 1715-UM001J-EN-P - December 2020 263
Appendix B 1715-IB16D Digital Input Module Diagnostics
Closed Switch/On Condition
If SW1 is closed, then current only flows through R2, so to calculate the voltage
present at the input module, use the R2 value of 3.9 kRtotal
Figure 80 - Closed Switch/On Condition
6.5
6.0
3.5
3.0
5.1V Falls
Within The
Range
Shield
(if used)
Terminal
Blocks
OV
20Ω
100Ω
50 mA
4.99kΩ
Termination
Assembly
+24V DC
R1
R2
45678
Solution For Voltage
5.1 k
SW1
3.9 k
15 k