User Manual Owner manual

Rockwell Automation Publication 1715-UM001C-EN-P - March 2014 281
1715-IB16D Digital Input Module Diagnostics Appendix C
Calculate On/Off Condition for Resistor Values
If a threshold value is set and we wanted to figure out which resistors to use, we
can follow these examples.
On Condition
For an on condition, use the following formulas.
In this case, the module load is 5.1 kand the supply voltage is assumed to be
24V DC. So, for this example, use Figure 77
and choose 13V DC, because it is a
value within the range in the threshold tables.
Figure 77 - On Condition
Shield
(if used)
Terminal
Blocks
OV
20Ω
100Ω
50 mA
4.99kΩ
Termination
Assembly
+24V dc
R1
R2
45678
5.1K
Module
Resistance
SW1