YASKAWA MEMOCON GL120 User Manual page 268

12 VDC
(24 VDC)
Fig. 6.21 Connecting Inductive Loads (Sourcing Inputs)
12 VDC
(24 VDC)
Fig. 6.22 Connecting Inductive Loads (Sinking Inputs)
2) Leakage Current from Input Devices
When connecting an input device that exhibits leakage current during the OFF state
(such as limit switch with LEDs) to a DC Input Module, the leakage current may be
too large to stay within the OFF voltage range and the input signal may never go
OFF.
The following diagram shows when a LED-equipped limit switch with a 3-mA leak-
age current is connected to the Input Module (12/24 VDC, 16-point).
Input device
(limit switch with LED)
Flywheel diode
Inductive load
Input
Input
Common
Flywheel diode
Inductive load
Input
Input
Common
Input
Leakage current = 3 mA
Common
Power supply
for input signal
(12/24 VDC)
6-41
6.4 Precautions on Wiring
DC Input Module
Input impedance
Zi
6