9
DEVICE EXPLANATION
9.2 Internal User Devices
9.2.1 Input (X)
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9.2.1 Input (X)
(1) Definition
Inputs transmit commands or data to the CPU module from an external device such
as push-button switches, selector switches, limit switches, digital switches.
(2) Concept of input (X)
If the input point is the Xn virtual relay inside the CPU module, the program uses the
Xn's N/O contact or N/C contact.
(3) Number of used N/O and N/C contacts
There are no restrictions on the number of Xn N/O contacts and N/C contacts used in
a program, provided the program capacity is not exceeded.
Diagram 9.2 Commands from external devices to CPU module
Diagram 9.3 Inputs(X)
Diagram 9.4 Input(X) Used in Program
1
2
3
Push-button switch
Selector switch
Digital switch
Input (X)
Sequence
operation
LS2
PB1
PB8
X108
X102
X100
Virtual relay
Program
Input ladder (external device)
X108
X100
X102
Programmable
controller
X100
Y101
X100
X100
Y100
Y101
Y102
X102
X104
X104
No restrictions on the
quantity used.
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