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3
SPECIFICATIONS
Signal Direction QJ71MT91 → Programmable controller CPU
Device
Signal name
No.
MODBUS device assignment parameter
setting existence
XA
ON : Parameters set
OFF: No parameters set
XB
XC
XD
XE
XF
X10
X11
X12
Use prohibited
X13
X14
X15
X16
X17
X18
X19
X1A
COM.ERR.LED status
X1B
ON : Lit
OFF: Not lit
PING test completed
X1C
ON : PING test completed
OFF:
X1D
Use prohibited
X1E
Watch dog timer error
X1F
ON : Module error occurred
OFF: Module operating normally
3 - 4
Reference
section
Section
Section
11.4.2
Section
11.5.2
Section
Important
Among the I/O signals for the programmable controller CPU, do not output (turn
ON) the "Use prohibited" signals.
Doing so may cause the programmable controller system malfunction.
Signal Direction Programmable controller CPU → QJ71MT91
Device
No.
YA
9.1.3
YB
YC
YD
YE
YF
Y10
Use prohibited
Y11
Y12
Y13
Y14
Y15
Y16
Y17
Y18
Y19
Y1A
COM. ERR. LED OFF request
Y1B
ON : Being requested
OFF: Not requested
PING test execution request
ON : PING test execution being
Y1C
requested
OFF: PING test execution not request
Y1D
Y1E
Use prohibited
Y1F
11.1
MELSEC-Q
Signal name
Reference
section
Section
11.4.2
Section
11.5.2
3 - 4
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