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
14.1
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.
Status LEDs on a CPU
The CPU provides the following status indicators:
● STOP/RUN
● ERROR
● MAINT (Maintenance) flashes whenever you insert a memory card. The CPU then
You can also use the LED instruction (Page 282) to determine the status of the LEDs.
Table 14- 1
Status LEDs for a CPU
Description
Power is off
Startup, self-test, or firmware update
Stop mode
Run mode
Remove the memory card
Error
Maintenance requested
S7-1200 Programmable controller
System Manual, 11/2011, A5E02486680-05
– Solid yellow indicates STOP mode
– Solid green indicates RUN mode
– Flashing (alternating green and yellow) indicates that the CPU is in STARTUP mode
– 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
Off
Flashing
(alternating yellow and green)
On (yellow)
On (green)
On (yellow)
On (either yellow or green)
On (either yellow or green)
STOP/RUN
Yellow / Green
14
ERROR
MAINT
Red
Yellow
Off
Off
-
Off
-
-
-
Flashing
Flashing
-
On
-
-
-
633
- Quick Links:
- Introducing the S7-1200 Plc
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