Mitsubishi Electric MELDAS C6 Interface Manual page 240

B con-
Signal name
tact
—
M FUNCTION FINISH 1
[Function]
This status signal informs the controller that specified miscellaneous (M) function, spindle (S)
function, tool (T) function or 2nd miscellaneous function (A, B or C) is accomplished on the PLC
side.
[Operation]
If the M, S, T or 2nd M function command is executed during automatic operation, the code and
each function strobe (MF1 to MF4, SF1 to 7, TF1 to 4, BF1 to BF4) will turn ON.
When the PLC verifies that one or more M, S, T and/or B function has been specified, it performs
that function(s) and, after completion of the function(s), "M function finish 1" (FIN1) signal turns
OFF.
When the controller verifies that signal FIN1 turns ON, it turns OFF strobe signal of corresponding
function.
The PLC checks that each strobe signal turns OFF, then turns OFF FIN1. With the signal FIN1
turned OFF, the controller proceeds to the next block.
An example of timing chart, where M function is specified, is as follows:
Command program
M function strobe (MF1)
M function finish 1 (FIN1)
There are two "M function finish" signals, namely, "M function finish 1" and "M function finish 2"
(Refer to the next page). The only difference is if the next block is proceeded to at the falling edge
or at the rising edge. These can be used separately per operation in one PLC.
(Note 1) "M function finish (FIN1)" signal is common to M, S, T and B functions.
(Note 2) The "M function finish 1" signal is also the signal for upgrading the spindle speed output (S
analog data, etc.) during S function execution.
(Note 3) If signal FIN1 has been ON before M, S, T or B function is specified, data pertinent to M, S,
T or B function are not output. To output, the signal FIN1 should be turned OFF once.
(Note 4) When "Reset & rewind" (RRW) signal is sent to the controller by M02 or M30, "M function
finish" 1 or 2 signal should not be sent back. If the M function finish 1 (2) signal is return
with the M02 command at the end of the machining program, the NC alarm "P36
PROGRAM END ERR" will occur.
[Related signals]
(1) M function finish 2 (FIN2: Y71F)
(2) M, S, T, B function strobe (MF1 to MF4, SF1 to 7, TF1 to 4, BF1 to 4: X644 to 647, X658 to 65E,
X650 to 653, X654 to 657)
(3) M, S, T, B function data (output to file register R)
(4) Reset & rewind (RRW: Y71A)
6. EXPLANATION OF INTERFACE SIGNALS
6.3 PLC Output Signals (Bit Type: Y***)
Signal
abbreviation
FIN1
6-3-43
1st system 2nd system
Y71E Y7FE
M08
Next block
3rd system
Y8DE