Diagnostics Using Leds - Siemens SIMATIC ET 200S Manual

7.4

Diagnostics using LEDs

LEDs
The RUN, STOP, ON, BF, SF and FRCE LEDs of the IM 151-7 CPU display
important information on the states to the user.
The IM 151-7 CPU has the following 6 LEDs:
S "SF" LED (System Fault) for indicating the presence of a fault in the ET 200S
S "BF" LED (Bus Fault) for indicating faults on the PROFIBUS-DP
On the IM 151-7 CPU:
on the DP master module:
S "ON" LED for indicating that the ET 200S is connected to a power supply
S "FRCE" LED for indicating that a force request is active.
S "RUN" LED for indicating that the IM 151-7 CPU is in RUN mode
S "STOP" LED for indicating that the IM 151-7 CPU is in STOP mode
The meaning of the LEDs for CPU functionality is described in detail in Section 8.2.
The "BF" LED on the DP master module indicates in the DP master mode that
errors have occurred in the PROFIBUS-DP.
"ON" LED is off
If the "ON" LED is off, either no supply voltage or insufficient supply voltage is
being applied to the electronic components/sensors of the ET 200S. The cause is
likely to be a defective fuse or inadequate or nonexistent system voltage.
ET 200S IM 151-7 CPU Interface Module
A5E00058783-04
Commissioning and Diagnostics
Bus fault on slave strand
Bus fault on master strand
7-9