Proximity Sensors and Optical Sensors
Proximity sensors issue a signal to the PLC when an object is in close proximity of the sensor.
It is not necessary for the object to touch the sensor. This advantage makes many applications
possible. There are two types of proximity sensors; inductive and capacitive.
There are also many varieties of optical sensors that may be found in industrial applications.
Most opto and proximity sensors utilise semiconductor outputs and these are available in two
polarities, which are:
쎲 PNP (source)
쎲 NPN (sink)
The supply voltages to these sensors are commonly 24V DC.
Example for an negative common input module
*
The response times for OFF -> ON and ON -> OFF can not be set separately.
MELSEC System Q Beginners Manual 3 – 19
Digital Input and Output Modules Das MELSEC System Q
Item Specifications
Type of module QX80
Number of input points 16
Isolation method Opto-coupler
Rated input voltage 24 V DC (+20/-15%, ripple ratio within 5%)
Rated input current Approx. 4 mA
Input derating 100 % (All inputs can be switched on simultaneously.)
Inrush current Max. 200 mA for 1 ms (@ 132 V AC)
Voltage / current for ON 19 V DC or higher/ 3 mA or higher
Voltage / current for OFF 11 V DC or lower / 1.7 mA or lower
Input resistance Approx. 5.6 k⏲
Response time
OFF 씮 ON
1, 5, 10, 20, 70 ms (CPU parameter setting, initial setting: 10 ms)*
ON 씮 OFF
Dielectric withstand voltage 560 V AC rms/3 cycles (altitude: 2000 m)
Insulation resistance 10 M⏲ or more (by insulation resistance tester)
Noise immunity
By noise simulator of 500 V p-p noise voltage, 1애s noise width and 25 to
60 Hz noise frequency
First transient noise IEC61000-4-4: 1kV
Groups of inputs 1 group with 16 inputs (Common terminal: terminal 18)
Operation indicator 1 LED for each input
External connections 18-point terminal block (M3 x 6 screws)
Applicable wire size 0.3 to 0.75 mm
2
, core: 2.8 mm OD max.
Internal current consumption
(5 V DC)
50 mA (all input points ON)
Weight 0.16 kg
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