Input (X) - Mitsubishi MELSEC QS Series User Manual

9
DEVICE EXPLANATION

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.
Push-button switch
Selector switch
Digital switch
1 2
Diagram 9.2 Commands from external devices to CPU module
Virtual relay
PB1
X100
LS2
X102
PB8
X108
Input ladder (external device)
No restrictions on the
quantity used.
Diagram 9.4 Input(X) Used in Program
Input (X)
Sequence
operation
3
X100
X102
X108
Program
Diagram 9.3 Inputs(X)
X100 X104
X100 X102 X104
Y101
X100
9.2 Internal User Devices
9.2.1 Input (X)
9
10
11
Programmable
controller
Y100
Y101
Y102
9
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