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MELSEC-Q
3 SPECIFICATIONS
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.
Device
number
Signal description
Reference
section
Device
number
Signal description
Reference
section
X0 1
CH1 Transmission normal completion
ON: Normal completion
Y0
CH1 Transmission request
ON: Requesting transmission
X1 1
CH1 Transmission abnormal completion
ON: Abnormal completion
Y1
CH1 Reception data read completion
ON: Data read completed
—
X2 1
CH1 Transmission processing
ON: Transmission in progress
Section 8.6.4
Section 8.6.5
Section 8.6.6
Y2
CH1 Mode switching request
ON: Requesting switch
Application,
Chapter 15
X3 2
CH1 Reception data read request
ON: Requesting read
Y3
X4 2
CH1 Reception abnormal detection
ON: Abnormal detection
Section 6.1
Section 7.1
Section 8.6.5
Section 8.6.6
Y4
X5 (For system) — Y5
X6 3
CH1 Mode switching
ON: Switching
Application,
Chapter 15
Y6
Use prohibited —
X7 1
CH2 Transmission normal completion
ON: Normal Completion
Y7
CH2 Transmission request
ON: Requesting transmission
X8 1
CH2 Transmission abnormal completion
ON: Abnormal completion
Y8
CH2 Reception data read completion
ON: Data read completed
—
X9 1
CH2 Transmission processing
ON: Transmission in progress
Section 8.6.4
Section 8.6.5
Section 8.6.6
Y9
CH2 Mode switching request
ON: Requesting switch
Application,
Chapter 15
XA 2
CH2 Reception data read request
ON: Requesting read
YA
XB 2
CH2 Reception abnormal detection
ON: Abnormal detection
Section 6.1
Section 7.1
Section 8.6.5
Section 8.6.6
YB
XC (For system) — YC
XD 3
CH2 Mode switching
ON: Switching
Application,
Chapter 15
YD
Use prohibited —
XE
CH1 ERR. occurrence
ON: Error occurring
YE
CH1 ERR.clear request
ON: Requesting error clear
XF
CH2 ERR. occurrence
ON: Error occurring
Section 8.6.10
Section 10.1.2
YF
CH2 ERR. clear request
ON: Requesting error clear
Section 8.6.10
Section 10.1.2
X10 6
Modem initialization completion
ON: Initialization completed
Y10
6
Modem initialization request (standby request)
ON: Requesting initialization
X11 6
Dialing
ON: Dial in progress
Y11
6
Connection request
ON: Requesting connection
X12 6
Connection
ON: Connection in progress
Y12
6
Modem disconnection request
ON: Requesting disconnection
Section 8.6.2
Application,
Chapter 3
X13 6
Initialization/connection abnormal completion
ON: Initialization/ connection abnormally completed
Y13 Use prohibited —
X14 6
Modem disconnection complete
ON: Disconnection completed
Y14 6
Notification- issued request
OFF: Requesting notification issuance
X15 6
Notification normal completion
ON: Normal completion
Y15
X16 6
Notification abnormal completion
ON: Abnormal completion
Section 8.6.2
Application,
Chapter 3
Y16
Use prohibited —
X17 1 Flash ROM read completion ON: Completed Y17 Flash ROM read request ON: Requesting
X18 1 Flash ROM write completion ON: Completed Y18 Flash ROM write request ON: Requesting
X19
Flash ROM system setting write completion
ON: Completed
—
Y19
Flash ROM system setting write request
ON: Requesting
—