Siemens SINUMERIK 840Di Manual page 398

10 NC Start-Up with HMI Advanced
10.10 NC/PLC diagnosis (840Di SW 2.3 and higher)
Group: NCK
latency time
10-398
Table 10-54 PLC operating state display per RUN/STOP evaluation
RUN STOP
lit off
off lit
Flashes at 0.5 Hz lit
Flashes at 2 Hz lit
off – lit
– off for 3 secs
– lit
off – lit
– flashes at 2Hz
for at least. 3
secs
– lit
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 200µ
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.
PLC operating state
RUN The PLC program is running.
STOP: The PLC program is not running. STOP
can be triggered by the PLC program, by an er-
ror or per user operation.
HOLD: The PLC user program was halted (trig-
gered by a test function).
RESTART: A PLC start–up is performed (transi-
tion from STOP to RUN). If the action is aborted,
a transition to STOP take place.
General reset: General reset requested.
General reset: General reset active
secs
are Real–time violations, for which the func-
 Siemens AG, 2003. All rights reserved
SINUMERIK 840Di Manual (HBI) – 06.03 Edition
06.03