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6 NC Machine Data (NC MD), NC Setting Data (NC SD) 09.95
6.6.3 Channel-specific MD bits 1 (channel bits)
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7 6 5 4 3 2 1 0
Bit No.
NC MD
544*
F H D T S M
No F value
output to
PLC
Output of auxiliary functions in BCD
Default value: All 0
Active: In the next block
Bit 7-2 Bit 7-2=1 The auxiliary function is output to the PLC in BCD. Bit 2 may not be set
to 1 because of the basic PLC program.
Bit 7-2=0 If the basic program M functions are to be decoded.
The auxiliary function is output to the PLC in hexadecimal (binary).
Bit 0 F value output to the PLC is deselected via machine data. This makes it
possible to improve the time required for block changes involving travel
blocks with F values, as it is not necessary to wait for an acknowledge-
ment from the PLC (e.g. 5D machining).
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a
a
a
a
a
a
a
a
a
7 6 5 4 3 2 1 0
Bit No.
NC MD
546*
F H D T S M
No aux.
function on
block
search
Aux. functions that are output immediately
instead of being collected during block search with calculation
Default value: All 0
Active: At once
Bit 7, 6, 5, 4, 3, 2
The auxiliary function types defined by these bits are not collected during a
block search with calculation, but are output immediately (may result in PLC
based triggering of several switching functions in succession).
Bit 0 When this bit is set, all auxiliary functions (M, S, T, D, H and F) encountered
during a block search with calculation are skipped and ignored (no output to
PLC and no internal reaction).
6–138 ©
Siemens AG 1992 All Rights Reserved 6FC5197- AA50
SINUMERIK 840C (IA)
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