xiB & xiB-64 - Technical Manual Version 1.06
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figure 3-31, Connecting Digital OUTPUT to a NPN-compatible PLC device input (biased)
Important note:
•
If using this configuration, take into account that Common Ground connection may be biased by power supply for Digital
Input!
Connecting Digital OUTPUT to a NPN-compatible PLC device input
This type of connection is possible only when opto-isolated input is used (bidirectional in some cases) or when only one general
opto-isolated input is used.
Output state
Output switch state
Input state
ON
Sourcing current
Pull down (energized)
OFF
Relaxing
Not energized
figure 3-32, Connecting Digital OUTPUT to a NPN-compatible PLC device input - more bidirectional inputs used
Note:
•
In this case a bidirectional opto-isolated input must be used
figure 3-33, Connecting Digital OUTPUT to a NPN-compatible PLC device - single input
GND (Common IO Ground)
DIGITAL OUTPUT
Common
PLC Device
Input
Camera
Power Supply
GND (Common IO Ground)
DIGITAL OUTPUT
Common
PLC Device
Input
Camera
Power Supply
GND (Common IO Ground)
DIGITAL OUTPUT
IN-
PLC Device
IN+
Camera
Power Supply