Siemens SINUMERIK 840 sl, Manual

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Diagnostics
8
8.1 LED displays
LEDs H500 to H505 on the COM board provide information about the following states:
①
H500 - POWER OK (green)
②
H501 - BUSFAULT (red)
③
H502 - BUSSYNC (green)
④
H505: TEMP ALARM (red)
Figure 8-1 MCP 398C - LEDs
Name State Meaning
H500 Lit All internal voltages are in the setpoint range.
Not lit At least one of the generated voltages has fallen below its setpoint; a
reset will be initiated.
H501 Not lit No PROFINET communication.
Lit PROFINET is synchronized (STOP state).
Flashes (0.5 Hz) PROFINET is synchronized (RUN state).
H502 Lit PROFINET group fault.
H505 Lit The upper limit temperature (T_Critical) of temperature sensor LM77 has
been exceeded.
8.2 Output functions
Requirements
● The MCP is booting.
● There is no communication yet between the MCP and the control, i.e. all of the key LEDs
are flashing.
● The MCP must be in the IE operating mode. For further information, see Settings of switch
S2 (Page 17).
In this state, the output functions described in the following can be sequentially called.
Machine control panel: MCP 398C
Manual, 07/2018, A5E43199783B AB
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