Inputs (X) - Mitsubishi Electric MELSEC-Q Series User Manual

10 DEVICES

10.2.1 Inputs (X)

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(1) Definition
(a) Inputs are commands or data transmitted to the Basic model QCPU from a
peripheral device by push-button switches, selector switches, limit switches,
digital switches, etc.
(b) The input point is the Xn virtual relay inside the Basic model QCPU, with the
program using the Xn's N/O contact or N/C contact.
Virtual relay
PB1
LS2
PB16
Input ladder (external device)
(c) There are no restrictions regarding the number of Xn N/O contacts and N/C
contacts used in a program.
No restrictions regarding
the quantity used.
Push-button switch
Selector switch
Digital switch
1 2 3
X0
X0
X1
X1
XF
XF
Figure 10.1 Inputs(X)
X0 X2
X0 X1
Y21
X0
Figure 10.2 Input(X) Used in Program
Input (X)
Sequence
operation
Program
X2
MELSEC-Q
Programmable
controller
Y20
Y21
Y23
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