7.2 Evaluation of the diagnostic displays H1/H2
The PCU 50.5 has the diagnostics displays "H1" and "H2", which output status codes by means
of LEDs and 7-segment displays. In particular, these simplify the diagnostics of the PCU 50.5
in headless mode (without a screen or input devices).
If an error is found, you can connect a screen for further error analysis.
Figure 7-1 Diagnostics displays H1 and H2 of the PCU 50.5 with LEDs and 7-segment displays
The diagnostics displays display the following information:
● The diagnostics display "H1" displays status codes of the PCU-Basesoftware.
● The diagnostics display "H2" is assigned to the application software.
The meaning of the displayed status codes depends on whether the PCU 50.5 is in system
startup (Page 156) mode, running mode (Page 156), or shutdown (Page 156) mode.
Further information
Additional information on the diagnostics display, e.g. the meaning of the BIOS POST codes,
can be found in the Manual SINUMERIK 840D sl Operator Components and Networking.
Table 7-1 Status codes of the diagnostics display during the system power up
LED H1 LED H2 7-segment
display H1/H2
Status
Orange Orange Output of the
BIOS post co‐
des
After switching on the system
Orange Off After cycling the BIOS
Orange Off After starting Windows
1 0 Starting Windows Loading of the device drivers
required by Windows
2 0 PCU hardware service The PCU hardware service has
been started.
5 0 Network Wait for network interfaces to
be ready
8 0 TCU support test step 1 Wait for FTP server to start
9 0 TCU support test step 2 Wait for TCU network boot proc‐
ess and starting of the TCU
hardware service
A 0 TCU support test step 3 Wait for VNC server to start
B 0 - -
E 0 PCU-Basesoftware General fault: see Windows
"Event Viewer"
Service and diagnostics
7.2 Evaluation of the diagnostic displays H1/H2
PCU Base Software (IM10)
156 Commissioning Manual, 12/2017, 6FC5397-1DP40-6BA1
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