3.4.1 Output of M-functions
M-functions operative at block-beginning.
Timing diagram:
Start
\
.
Static output:
a) M-code, 8 bit BCD parallel
L
b) decoded M-functions
B
M-Strobe
I
-1
I
I I
MP120
MP 121
4
+
wait for feedback
MP 122
“Auxiliary function completed”
Please note:
The programmed time in machine parameter 121 must be less than the time in machine parameter 122.
The M-code is provided as a static signal. The impulse duration of the M-gating signal is programmed with
machine parameters 120 and 121. After duration of the time period programmed with 122, the control input
ist interrogated for the feedback signal: “Auxiliary function completed”. When -this input is at + 24 V, the
M-code signals are inactive and program run is resumed. If this input is inactive, (at 0 V), the M-code signals
are output and program run is interrupted until the input is re-activated (at 24 V).
.
The number of M-functions depends on the type of decoding in the machine interface.
With external decoding, 100 different M-functions can be programmed.
Without external decoding, 9 different M-functions can be programmed.
a) Coded M-functions
Output is in 8-4-2-l BCD-code, 2 decades parallel. (Decoded M-functions are present with the corresponding
coded M-functions simultaneously). The table on next page shows which M-functions are operative at the be-
ginning or end of a block, and the appropriate coding.
13
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