xiQ - Technical Manual Version 1.0
44
Connecting Digital OUTPUT to a PNP-compatible device
3.8.4.4.3.
Output state
Output switch state
Input state
ON
Sinking current
Not energized
OFF
Relaxing
Pull up (energized)
figure 3-36, Connecting Digital OUTPUT to a PNP-compatible device
Pull up resistor can be calculated as follows:
psu
input
input
V
V
R
I
Where:
psu
V
power supply voltage. Must be higher than required input amplitude
input
V
required input amplitude
input
I
input driving current (corresponding to input amplitude)
Remember to use the appropriate resistor power rating ( ) (
) *
psu
input
input
P R
V
V
I
Output Wiring Example: LED Driving
3.8.4.4.4.
LED can be driven directly by camera digital output. A series resistor must be used to limit LED current.
figure 3-37, LED Driving
LED series resistor can be calculated by the following equation:
psu
output
led
led
V
V
V
R
I
Where:
psu
V
power supply voltage (5V to 24V)
output
V
voltage across digital output pins (see.
3.8.4.3 Digital Output – Internal schematic
led
V
LED forward voltage (see table below)
led
I
LED current
Note:
•
Remember to use the appropriate resistor power rating
(
)
*
*
led
led
P RES
I
I
R
GND (Common IO Ground)
DIGITAL OUTPUT
Common
PLC Device
Input
MQ Camera
Power Supply
External pull up
GND (Common IO Ground)
DIGITAL OUTPUT
MQ Camera
Power Supply
R
LED
V
PSU
V
OUTPUT