PLC concepts
4.5 Status LEDs
S7-200 SMART
System Manual, V2.3, 07/2017, A5E03822230-AF
101
The CPU and EM use LEDs to provide information about operational status.
The CPU provides the following LED status indicators:
STOP STOP: on
Applicable when the CPU is in
STOP Mode
STOP with Force RUN: off
STOP: blink at 1 Hz rate
Applicable when the CPU is in
STOP mode and a value is
forced
RUN RUN: on
Applicable when the CPU is in
RUN Mode
RUN with Force RUN: on
STOP: blink at 1 Hz rate
Applicable when the CPU is in
RUN mode and a value is
forced
Busy STOP, RUN: blink out of phase
at 2 Hz rate
ERROR: off
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
Memory Card Inserted STOP: blinks at 2 Hz rate
RUN, ERROR: off
Applicable when someone in-
serts a memory card into a
Memory Card OK STOP: blinks at 2 Hz rate
RUN, ERROR: off
Applicable when after card
evaluation during power-up or
restart, a memory card opera-
tion completes successfully
Memory Card Error STOP, ERROR: blink in phase
at 2 Hz rate
RUN: off
Applicable when after card
evaluation during power-up or
restart, a memory card opera-
tion terminates with an error
Defective STOP, ERROR: on
Applicable when the CPU is in
Defective Mode
Ping STOP, RUN: blink out of phase
at 2 Hz rate
ERROR: blink in phase with
Applicable when the CPU re-
ceives a Signal DCP control
request (Flash LEDs)
The expansion modules (EM) provide the following LED status indicators:
To Next Page
Loading...
