Siemens ET 7Y Series Spezifikationen Seite 117

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Functions of the IM 151-7 CPU
8-5
ET 200S IM 151-7 CPU Interface Module
A5E00058783-04
Meanings of the LEDs for CPU functionality
For the IM 151-7 CPU there are 2 separate LEDs, which indicate the operating
mode of the CPU:
RUN
STOP
You can obtain information on the power supply of the CPU, on force requests and
on general errors via 3 additional LEDs.
Table 8-3 LEDs for CPU functionality
LED
Description Description
ON (green) Power on Comes on when the supply voltage is applied to the CPU
RUN (green) RUN mode Shines continuously when the CPU is not processing the user
program.
Flashes at 2 Hz during CPU start-up:
For at least 3 secs, but the CPU start-up can also be shorter.
During the CPU start-up the STOP LED also lights up; when
the STOP LED goes off, the outputs are enabled.
Flashes at 0.5 Hz when the CPU has reached a breakpoint you
have set. At the same time the STOP LED comes on.
STOP (yellow) STOP mode Comes on when the CPU
is not processing a user program.
Has reached a breakpoint you have set At the same time the
RUN LED flashes at 0.5 Hz
Flashes at 0.5Hz, when the CPU requests a memory reset (see
Section 7.2).
FRCE (yellow) Force request
active
Lights up when a force request is active.
SF (red) Group error Lights up in the event of
Programming errors
Parameter assignment errors
Calculation errors
Timing errors
I/O errors
Hardware errors
Firmware errors
To determine the exact nature of the error/fault, you have to use a
PD and read out the contents of the diagnostic buffer.
Meanings of other LEDs
The LEDs ”SF” (from the PROFIBUS-DP viewpoint) and ”BF” are described in
Section 7.4.
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