Dräger REGARD 7000 Instructions For Use Manual page 26

System components
When dimensioning the resistors, the supply voltage of the REGARD 7000
System should be taken into account as neither the Docking Stations nor the
modules perform 24 V voltage regulation. A change of the supply voltage has a
linear effect on the currents. This does not affect the configured switching and static
currents. For further information, see the following chapter: "Port configuration
Digital Input Module", page 100
Example of falling application 1 (1 switch or button)
1
2
3
4
5
3
= 37,5 mA
1
Digital In +
24V
Digital In -
Wire break current (0.5 x static current)
Static current
Current threshold (negative, in this example -20 mA)
Current through end-of-line resistor
Current states
R = 24 mA
S1
4
= 51 mA
EOL
R
S1
1kΩ
1W
S
1
2
5
EOL
470Ω
1,5W