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3.4.1
Output
of M-functions
M-functions
operative
at block-beginning.
Timing diagram:
'
Static output:
a) M-code,
8 bit BCD parallel
b) decoded
M-functions
,
1
M-Strobe
I
I
Feedback
signal
"Auxiliary
function
completed"
"Auxiliary
function
completed"
Please note:
The programmed
time in machine
parameter
121 must be less -:han 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 Fleriod 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 inactiive 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-functiions
depends
of the type of decoding
in the machine
interface.
With external
decoding,
100 different
M-functions
can be programmed.
Without
external
decodiing,
9 different
M-functions
can be programmed.
a)
Coded M-functions
Output
is in 8-4-2-l
BCD-code,
2 decades parallel.
(Decoded
N-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.
12
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