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MELSEC-Q
3 SPECIFICATIONS AND FUNCTIONS
3.3 Specifications of input/output signals with PLC CPU
3.3.1 List of input/output signals with PLC CPU
The QD75 uses 32 input points and 32 output points for exchanging data with the PLC
CPU.
The input/output signals when the QD75 is mounted in slot No. 0 of the main base unit
are shown below.
Device X refers to the signals input from the QD75 to the PLC CPU, and device Y
refers to the signals output from the PLC CPU to the QD75.
Signal direction: QD75 PLC CPU Signal direction: PLC CPU QD75
Device No. Signal name Device No. Signal name
X0 QD75 READY Y0 PLC READY
X1 Synchronization flag Y1
X2 Y2
X3
Use prohibited
Y3
Use prohibited
X4 Axis 1 Y4 Axis 1
X5 Axis 2 Y5 Axis 2
X6 Axis 3 Y6 Axis 3
X7 Axis 4
M code ON
Y7 Axis 4
Axis stop
X8 Axis 1 Y8 Axis 1 Forward run JOG start
X9 Axis 2 Y9 Axis 1 Reverse run JOG start
XA Axis 3 YA Axis 2 Forward run JOG start
XB Axis 4
Error detection
YB Axis 2 Reverse run JOG start
XC Axis 1 YC Axis 3 Forward run JOG start
XD Axis 2 YD Axis 3 Reverse run JOG start
XE Axis 3 YE Axis 4 Forward run JOG start
XF Axis 4
BUSY
YF Axis 4 Reverse run JOG start
X10 Axis 1 Y10 Axis 1
X11 Axis 2 Y11 Axis 2
X12 Axis 3 Y12 Axis 3
X13 Axis 4
Start complete
Y13 Axis 4
Positioning start
X14 Axis 1 Y14 Axis 1
X15 Axis 2 Y15 Axis 2
X16 Axis 3 Y16 Axis 3
X17 Axis 4
Positioning complete
Y17 Axis 4
Execution prohibition flag
X18 Y18
X19 Y19
X1A Y1A
X1B Y1B
X1C Y1C
X1D Y1D
X1E Y1E
X1F
Use prohibited
Y1F
Use prohibited
Important
[Y1 to Y3], [Y18 to Y1F], [X2, X3], and [X18 to X1F] are used by the system, and cannot be
used by the user.
If these devices are used, the operation of the QD75 will not be guaranteed.