06.03
10.10 NC/PLC diagnosis (840Di SW 2.3 and higher)
10-398
Siemens AG, 2003. All rights reserved
SINUMERIK 840Di Manual (HBI) – 06.03 Edition
Table 10-54
PLC operating state display per RUN/STOP evaluation
RUN
STOP
PLC operating state
lit
off
RUN The PLC program is running.
off
lit
STOP: The PLC program is not running. STOP
can be triggered by the PLC program, by an er-
ror or per user operation.
Flashes at 0.5 Hz
lit
HOLD: The PLC user program was halted (trig-
gered by a test function).
Flashes at 2 Hz
lit
RESTART: A PLC start–up is performed (transi-
tion from STOP to RUN). If the action is aborted,
a transition to STOP take place.
off
– lit
– off for 3 secs
– lit
General reset: General reset requested.
off
– lit
– flashes at 2Hz
for at least. 3
secs
– lit
General reset: General reset active
The NCK latency time group combines the following information:
S
NCK latency time
The foundation for the SINUMERIK 840Di Real–time property is the cyclic
activation of the NC system software at defined intervals.
Since the NC and Windows NT share the available processor resources of
the PLC, there can be delays (latency times) when calling the NCK. Latency
times greater than 200
µ
secs
are Real–time violations, for which the func-
tional integrity of the NC is not longer guaranteed.
The latency time display of the NCK can be used to continuously monitor
the latency behavior of the NCK over a period of 50 seconds. Following re-
placement of extension of the HW and/or SW components, it is thus pos-
sible to determine whether, and if so to what extent, these have an effect on
the real–time behavior of the NCK.
Note
For details of real–time properties of the SINUMERIK 840Di, refer to Subsec-
tion 1.1.4, Page 1-24.
Group: NCK
latency time
10 NC Start-Up with HMI Advanced
