Leds For Cpu Functionality - Siemens SIMATIC ET 200S Manual

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:
S RUN
S 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
ON (green) Power on
RUN (green) RUN mode
STOP (yellow) STOP mode
FRCE (yellow) Force request
active
SF (red) Group error
Meanings of other LEDs
The LEDs "SF" (from the PROFIBUS-DP viewpoint) and "BF" are described in
Section 7.4.
ET 200S IM 151-7 CPU Interface Module
A5E00058783-04
Comes on when the supply voltage is applied to the CPU
Shines continuously when the CPU is not processing the user
program.
Flashes at 2 Hz during CPU start-up:
S
For at least 3 secs, but the CPU start-up can also be shorter.
S
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.
Comes on when the CPU
S
is not processing a user program.
S
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).
Lights up when a force request is active.
Lights up in the event of
S
Programming errors
S
Parameter assignment errors
S
Calculation errors
S
Timing errors
S
I/O errors
S
Hardware errors
S
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.
Functions of the IM 151-7 CPU
Description
8-5