251
7.4.12 Wet Contact Input
10Kohm
TTL Buffer
To
Micro Processor
+5V
GND
DI n
TTL
Device
7.4.13 Contact Closure Input
Digital
GND
Vcc
DI n
GND
Contact
Closure
7.4.14 Isolated Differential Input with External 24V power
To
Micro Processor
DI n
Ext.24V
Photo
Coupler
GND
Common
Power
