Status Leds - Siemens SIMATIC S7 System Manual

4.5

Status LEDs

The CPU and EM use LEDs to provide information about operational status.
CPU status LEDs
The CPU provides the following LED status indicators:
State
STOP
STOP with Force
RUN
RUN with Force
Busy
Memory Card Inserted
Memory Card OK
Memory Card Error
Defective
Ping
EM status LEDs
The expansion modules (EM) provide the following LED status indicators:
S7-200 SMART
System Manual, V2.3, 07/2017, A5E03822230-AF
LED Behavior
STOP: on
RUN, ERROR: off
RUN: off
STOP: blink at 1 Hz rate
ERROR: off
RUN: on
STOP, ERROR: off
RUN: on
STOP: blink at 1 Hz rate
ERROR: off
STOP, RUN: blink out of phase
at 2 Hz rate
ERROR: off
STOP: blinks at 2 Hz rate
RUN, ERROR: off
STOP: blinks at 2 Hz rate
RUN, ERROR: off
STOP, ERROR: blink in phase
at 2 Hz rate
RUN: off
STOP, ERROR: on
RUN: off
STOP, RUN: blink out of phase
at 2 Hz rate
ERROR: blink in phase with
RUN
PLC concepts
4.5 Status LEDs
Description
Applicable when the CPU is in
STOP Mode
Applicable when the CPU is in
STOP mode and a value is
forced
Applicable when the CPU is in
RUN Mode
Applicable when the CPU is in
RUN mode and a value is
forced
Applicable when after card
evaluation during power-up or
restart, a memory card opera-
tion is in progress or when a
restart operation is in progress
Applicable when someone in-
serts a memory card into a
powered-on CPU
Applicable when after card
evaluation during power-up or
restart, a memory card opera-
tion completes successfully
Applicable when after card
evaluation during power-up or
restart, a memory card opera-
tion terminates with an error
Applicable when the CPU is in
Defective Mode
Applicable when the CPU re-
ceives a Signal DCP control
request (Flash LEDs)
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