Online And Diagnostic Tools; Status Leds - Siemens SIMATIC S7 System Manual
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Also See for SIMATIC S7:
- System manual (866 pages) ,
- Functional safety manual (212 pages) ,
- User manual (134 pages)
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Online and diagnostic tools
9.1
Status LEDs
The CPU and the I/O modules use LEDs to provide information about either the operational
status of the module or the I/O. The CPU provides the following status indicators:
● STOP/RUN
● ERROR
● MAINT (Maintenance) flashes whenever you insert a memory card. The CPU then
Description
Power is off
Startup, self-test,
firmware update
Stop mode
Run mode
Remove the
memory card
Error
Maintenance
requested
Defective
hardware
LED test or
defective CPU
firmware
S7-1200 Programmable controller
System Manual, 11/2009, A5E02486680-02
– Solid orange indicates STOP mode
– Solid green indicates RUN mode
– Flashing (alternating green and orange) indicates that the CPU is starting up
– Flashing red indicates an error, such as an internal error in the CPU, a error with the
memory card, or a configuration error (mismatched modules)
– Solid red indicates defective hardware
changes to STOP mode. After the CPU has changed to STOP mode, perform one of the
following functions to initiate the evaluation of the memory card:
– Change the CPU to RUN mode
– Perform a memory reset (MRES)
– Power-cycle the CPU
STOP/RUN Orange / Green
(alternating orange and green)
(alternating orange and green)
Off
Flashing
On
(orange)
On
(orange)
On
(orange)
On
(either orange or green)
On
(either orange or green)
On
(orange)
Flashing
ERROR Red
MAINT Orange
Off
-
-
-
-
Flashing
Flashing
-
On
Flashing
Flashing
9
Off
Off
-
-
-
On
Off
269
- Quick Links:
- Introducing the S7-1200 Plc
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