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3 SPECIFICATIONS
MELSEC-Q
3.8 List of Input/Output Signals for the PLC CPU
This section describes the input/output signals of the Q series C24.
For assignments of the input/output signals shown in the table below, it is assumed that the Q series C24 is mounted in slot 0 of the basic base unit.
Device numbers starting with X indicate input signals from the Q series C24 to the PLC
CPU, and device numbers starting with Y indicate output signals from the PLC CPU to the Q series C24.
The following table lists the input/output signals for the PLC CPU.
Reference section
Device number
Signal description
X0
X1
X2
X3
X4
X5
X6
X7
X8
X9
XA
XB
XC
XD
XE
XF
X10
X11
X12
1
1
1
2
2
3
1
1
1
2
2
3
6
6
6
CH1 Transmission normal completion
ON: Normal completion
CH1 Transmission abnormal completion
ON: Abnormal completion
CH1 Transmission processing
ON: Transmission in progress
CH1 Reception data read request
ON: Requesting read
CH1 Reception abnormal detection
ON: Abnormal detection
(For system)
CH1 Mode switching
ON: Switching
CH2 Transmission normal completion
ON: Normal Completion
CH2 Transmission abnormal completion
ON: Abnormal completion
CH2 Transmission processing
ON: Transmission in progress
CH2 Reception data read request
ON: Requesting read
CH2 Reception abnormal detection
ON: Abnormal detection
(For system)
CH2 Mode switching
ON: Switching
CH1 ERR. occurrence
ON: Error occurring
CH2 ERR. occurrence
ON: Error occurring
Modem initialization completion
ON: Initialization completed
Dialing
ON: Dial in progress
Connection
ON: Connection in progress
X13
X14
X15
X16
6
6
6
6
Initialization/connection abnormal completion
ON: Initialization/ connection abnormally completed
Modem disconnection complete
ON: Disconnection completed
Notification normal completion
ON: Normal completion
Notification abnormal completion
ON: Abnormal completion
X17 1 Flash ROM read completion ON: Completed
X18 1 Flash ROM write completion ON: Completed
X19
Flash ROM system setting write completion
ON: Completed
Reference section
Section 8.6.4
Section 8.6.5
Section 8.6.6
Section 6.1
Section 7.1
Section 8.6.5
Section 8.6.6
—
Application,
Chapter 15
Section 8.6.4
Section 8.6.5
Section 8.6.6
Section 6.1
Section 7.1
Section 8.6.5
Section 8.6.6
—
Application,
Chapter 15
Section 8.6.10
Section 10.1.2
Section 8.6.2
Application,
Chapter 3
—
Device number
Y0
Y1
Y2
Y3
Y4
Y5
Y6
Y7
Y8
Y9
YA
YB
YC
YD
Y17
Y18
Y19
CH1 Transmission request
ON: Requesting transmission
CH1 Reception data read completion
ON: Data read completed
CH1 Mode switching request
ON: Requesting switch
CH2 Transmission request
ON: Requesting transmission
CH2 Reception data read completion
ON: Data read completed
CH2 Mode switching request
ON: Requesting switch
Flash ROM read request ON: Requesting
Flash ROM write request ON: Requesting
Flash ROM system setting write request
ON: Requesting
Signal description
Use prohibited
Use prohibited
YE
YF
Y10 6
Y11 6
Y12 6
CH1 ERR.clear request
ON: Requesting error clear
CH2 ERR. clear request
ON: Requesting error clear
Modem initialization request (standby request)
ON: Requesting initialization
Connection request
ON: Requesting connection
Modem disconnection request
ON: Requesting disconnection
Y13
Y14 6
Notification- issued request
OFF: Requesting notification issuance
Y15
Y16
Use prohibited
Use prohibited
—
Application,
Chapter 15
—
—
Application,
Chapter 15
—
Section 8.6.10
Section 10.1.2
Section 8.6.2
Application,
Chapter 3
—
—
—
3 - 15 3 - 15
3 SPECIFICATIONS
MELSEC-Q
Device number
X1A
X1B
X1C
Signal description
CH1 Global signal ON: Output instructed
CH2 Global signal ON: Output instructed
System setting default completion
ON: Completed
(For system) X1D
X1E 4 Q series C24 ready ON: Accessible
X1F 5
Watchdog timer error (WDT error)
ON : Module error occurred
OFF: Module being normally operated
Reference section
Section 3.10,
Reference
Section 8.4.11
—
—
—
Device number
Y1A
Y1B
Y1C
Y1D
Y1E
Y1F
Signal description
Use prohibited
System setting default request
ON: Requesting
Use prohibited
Reference section
—
Section 8.4.11
—
1 The device does not turn on/off by execution of a dedicated instruction when a function that corresponds to the input signal is used.
2 The device does turn on/off by execution of a dedicated instruction when a function that corresponds to the input signal is used (from ON to OFF: Data read completed).
3 The mode switching signal (X6/XD) turns ON at mode switching, receive clear, user frame receive designation or transmission sequence initialization.
While the mode switching signal (X6/XD) is ON, do not issue a communication request to the target interface.
(The communication processing of the Q series C24 is stopped while the mode switching signal (X6/XD) is ON.)
4 The Q series C24 ready signal indicates whether or not it is possible to access the
Q series C24 from the PLC CPU.
Use it as a interlock signal for a sequence program.
(It turns on about one second after turning the power ON and reset operation.)
5 Restart the PLC CPU when the watchdog timer error signal is turned on (reset the power and the CPU module).
6 QJ71C24N-R4 cannot be used. (Related to modem function signal.)
• X10 to X16: For system
• Y10 to Y16: Use prohibited
IMPORTANT
(1) Of the input/output signals to the PLC CPU, the signals marked with "Use prohibited" must not be output (ON).
If any of the "Use prohibited" signals is output, the PLC system may malfunction.
(2) When the modem function is not used or the QJ71C24N-R4 is used, X10 to
X16 are used for the system and Y10 to Y16 cannot be used.
POINT
(1) The input/output signals shown in this section are the signals used when a QnA series serial communication module program is utilized for the Q series C24
(see Section 2 in appendix).
In the QCPU, the on/off of input/output signals to intelligent function modules is executed with a dedicated instruction.
It is not necessary to turn the signals on/off by the sequence program, except for the input/output signals shown in the programming of each function reference page.
(2) When a program for a QnA series serial communication module is also utilized for the Q series C24, it is recommended to replace the instructions with the dedicated instructions shown on the corresponding function reference page of each manual for the Q series C24.
3 - 16 3 - 16
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