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21 DEVICES
21.2 User Devices
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21.2 User Devices
This section explains user devices.
Input (X)
Provides the CPU module with commands and data by external devices such as push buttons, selector switches, limit
switches, digital switches, etc.
Concept of input
You can think each input point as having a virtual relay Xn built into a single CPU module. The program uses NO/NC contact
of Xn.
Output (Y)
Outputs program control results to external signal lamps, digital indicators, contactors, solenoids, etc.
1 2 3
Push-button switch
Selector switch
Digital switch
Input (X)
CPU Module
X1
X0
X7
PB2
PB1
X0
X1
X7
PB16
Input ladder (external device) Program
PLCs
Virtual relay
CPU Module
Output (Y)
Signal lamp
Digital display
Contactor