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1.4 External I/O Signal and I/O Number
(1) Wiring of I/O devices
The signals output from the external input devices are substituted by the input
numbers which are determined by the installation positions and terminal
numbers of the connected input module and used in a program.
For the operation results output (coil), use the output numbers which are
determined by the installation position and the terminal number of the output
module to which the external output module is connected.
01234
(Power
supply)
(CPU)
(QX)
(QY)
Slot numbers
Base unit
PB1
CS1
CS2
PB2
PB3
LS1
LS2
LS3
LS4
PB4
PB5
CS3
X0
X1
X2
X3
X4
X5
X6
X7
X8
X9
XA
XB
XC
XD
XE
XF
COM
Input numbers
Output numbers
Y10
Y11
Y12
Y13
Y14
Y15
Y16
Y17
COM1
Y18
Y1F
COM2
MC3
MC2
MC1
RL
V3
V2
V1
Input module
Output module
GL
Input numbers are hexadecimal numbers that start
with 0. Input/output numbers share the same numbers.
"X" at the beginning of the number represents "Input",
and "Y" indicates "Output".
The maximum number of the QCPU (Q mode)
input/output number is 4,096.
The input/output number is sometimes referred
to as the I/O number (IN/OUT).
Figure 1.4 Wiring of I/O devices