Rockwell Automation Allen-Bradley 1715-AENTR - Page 266

266 Rockwell Automation Publication 1715-UM001J-EN-P - December 2020
Appendix B 1715-IB16D Digital Input Module Diagnostics
Figure 81 - On Condition
4.3 kis a close standard value, so we use 3.9 kwhich changes the voltage
slightly, but not enough to cause the range to change.
Off Condition
For an off condition, we must add a resistor to the formula. We already know
that R2 is 3.9 k
so we can use that, too.
Shield
(if used)
Terminal
Blocks
OV
20Ω
100Ω
50 mA
4.99kΩ
Termination
Assembly
+24V DC
R1
R2
45678
5.1 k
Module
Resistance
SW1
45682
45683