Status And Error Displays - Siemens SIMATIC S7-300 Hardware And Installation Manual

Testing functions, Diagnostics and Fault Elimination
Status and error displays of all CPUs
Table 10-2

Status and error displays

LED
SF 5 VDC FRCE
LED LED LED LED off
off off off
LED On X (see LED off
off the
descri
ption)
On On X LED off
X On X LED off
X On X LED off
X On X Flashes
(2 Hz)
X On X Flashes
(0.5 Hz)
On On X X
X X On X
Description of status X:
This status is irrelevant for the current CPU function.
10-8
RUN STOP
mode
LED off CPU power supply missing.
Remedy:
Check whether the power supply module is connected to
mains and switched on.
Check whether the CPU is connected to the power supply
module and switched on.
On The CPU is in STOP mode.
Remedy: Start the CPU.
On The CPU is in STOP mode as a result of error.
Remedy: refer to the tables below, evaluate the SF LED
Flashes The CPU requests memory reset.
(0.5 Hz)
Flashes The CPU executes memory reset.
(2 Hz)
On The CPU is in Startup mode.
On The CPU was halted by a programmed break point.
For details refer to the Programming Manual Programming
with STEP 7 .
X Hardware or software error
Remedy: refer to the tables below, evaluate the SF LED
X You have activated the Force function
For details refer to the Programming Manual Programming
with STEP 7 .
Description
S7-300 Programmable Controller Hardware and Installation
A5E00105492-01