Siemens SINUMERIK 840Di Manual page 25

06.03
Real-time
violations
Screen resolution
and depth of color
Testing or
switchover
Terminating the
NCK
 Siemens AG, 2003. All rights reserved
SINUMERIK 840Di Manual (HBI) – 06.03 Edition
Real-time violations occur when unsuitable PC components interrupt process-
ing for too long stopping the NC system software from being activated at the
specified time.
Inappropriate PC components are drivers or hardware extensions that have a
negative influence on the real-time behavior due to too long interrupt disable
times or PCI bus disables in conjunction with PCI bus mastering.
With real-time violations exceeding 200µ
system software will operate correctly. Depending on the size of the real-time
violation, an appropriate system reaction will occur:
– Display of an error message
– Alarm with axis stop from the NC
– Alarm and drive-independent axis stop.
The real-time behavior can be monitored using the system diagnosis included in
840Di start-up. (see Section 1.5, Page 1-38) or the NC/PLC diagnosis of the
HMI Advanced (see Section 10.10, Page 10-395).
The following points must be taken into account for screen resolution and depth
of color settings on the PCU.
S
Screen resolution
The standard screen resolution setting depends on the optimized value that
was set for the operator panel. This value was defined for technical reasons
and should be adhered to. Screen resolutions greater than 1024*768 pixels
are not supported.
S
Color depth
The default color depth setting is 256 colors. Higher values can, in certain
circumstances, increase the amount of processor time used by Windows NT
and sporadically also by the real-time operating system.
For safe operation in all real-time operating modes, the permissible color
depth is restricted to 65536 colors.
In unfavorable situations, e.g. if the software causes a high load on the CPU
(e.g. due to a large number of axes or short interpolation cycles), sporadic
real-time violations or a time-out on the interpolation level of the NCK can
occur.
If it is necessary to test the screen resolution or switch to a different resolution
and/or color depth, the NCK must be terminated first from the Windows NT Con-
trol Panel. Otherwise a malfunction may occur in the real-time response.
The NCK is integrated in Windows NT as a "LogB Service". To exit or start the
function, go to:
Windows NT start bar: Start > Settings > Control Panel > Services > "LogB
Service" > Exit or Start
1 General on the SINUMERIK 840Di
1.1 Overview of SINUMERIK 840Di
sec
, we cannot guarantee that the NC
1-25