Technical Appendix
SINUMERIK 802S base line
6-17
Start-Up
6.2 PLC user interface signals
The following tables of the user interface signals between PLC and CNC (and
vice versa) are handled by the integrated fixed user program.
These signals can be displayed using PLC Status in the Diagnosis/Start-
Up/PLC Status menu.
6.2.1 Address ranges
Operand Identifier Description Range
V Data V0.0 to V79999999.7
(see below)
T Timers T0 to T15
C Counters C0 to C31
I Image of digital inputs I0.0 to I7.7
Q Image of digital outputs Q0.0 to Q7.7
M Flags M0.0 to M127.7
SM Special flags SM0.0 to SM 0.6 (see below)
AC ACCU AC0 ... AC3
Generating the V address range
Type
Identifier
(DB No.)
Range No.
(Channel / Axis No.)
Subrange Offset Addressing
10
(10–79)
00
(00–99)
0
(0–9)
000
(000–999)
symbolic
(8–digit)
Definition of special flag bits (SM) (read-only)
SM Bits Description
SM 0.0 Flags with a defined ONE signal
SM 0.1 Initial position: first PLC cycle ‘1’, following cycles ‘0’
SM 0.2 Buffered data lost – only valid in the first PLC cycle (‘0’ – data
o.k., ‘1’ – data lost)
SM 0.3 Power On: first PLC cycle ‘1’, following cycles ‘0’
SM 0.4 60 s clock (alternating ‘0’ for 30 s, then ‘1’ for 30 s)
SM 0.5 1 s clock (alternating ‘0’ for 0.5 s, then ‘1’ for 0,5 s)
SM 0.6 PLC cycle clock (alternating one cycle ‘0’, then one cycle ‘1’)
Notice
All empty user interface fields in the following tables are Reserved for
SIEMENS and may neither be written, nor evaluated by the user!
All fields with a “0” contain the value “logic =”.
Variable access rights
[r] is used to mark a read-only range
[r/w] is used to mark a read/write range
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