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MELSEC-Q
12 CONTROL SUB FUNCTIONS
Da. 1 Operation pattern
Md. 25 Valid M code
Cd. 7 M code OFF request
11 0011
Warning occurs at this timing.
t
m1 m3
m2
V
1
OFF
ON
OFF
OFF
ON
ON
0 1
0
0
Positioning start signal
BUSY signal
M code ON signal
Positioning
m1 and m3 indicate set M codes.
[XC, XD, XE, XF]
[Y10, Y11, Y12, Y13]
[X4, X5, X6, X7]
Fig. 12.40 Warning due to an M code ON signal during continuous path control
POINT
If the M code output function is not required, set a "0" in setting item "
Da.10
M
code" of the positioning data.
[3] Precautions during control
(1) During interpolation control, the reference axis M code ON signal is turned
ON.
(2) The M code ON signal will not turn ON if "0" is set in "
Da.10
M code". (The
M code will not be output, and the previously output value will be held in
"
Md.25
Valid M code".)
(3) If the M code ON signal is ON at the positioning start, an error "M code ON
signal start (error code: 536)" will occur, and the positioning will not start.
(4) If the PLC READY signal (Y0) is turned OFF, the M code ON signal will turn
OFF and "0" will be stored in "
Md.25
Valid M code".
(5) If the positioning operation time is short during continuous path control, there
will not be enough time to turn OFF the M code ON signal, and a warning "M
code ON signal ON (error code: 503)" may occur. In this case, set a "0" in
the "
Da.10
M code" of that section's positioning data.
(6) In the AFTER mode during speed control, the M code is not output and the
M code ON signal does not turn ON.
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