Self-Test Of The Simatic Rack Pc 840 Before Booting - Siemens SIMATIC Rack PC 840 Manual

6.7

Self-Test of the SIMATIC Rack PC 840 before Booting

When the PC is powered up, it runs a self-test (POST = Power On Self Test). If the
POST detects a fault, it outputs the sequence of beeps (beep code) assigned for
the fault or the FAN LED lights red. Each beep code consists of 2 x 2 sequences.
Conversion table for the beep codes to hexadecimal representation:
Example:
B
3
Check shutdown code
SIMATIC Rack PC 840 Manual
A5E00104826-03
Beeps
B
B
B
B
BB
BB
BB
BB
BBB
BBB
BBB
BBB
BBBB
BBBB
BBBB
BBBB
BBBB BBB BBB
6
B
BB
BBB
BBBB
B
BB
BBB
BBBB
B
BB
BBB
BBBB
B
BB
BBB
BBBB
Beeps
Hex-Code
Meaning
Error Diagnosis
Hex-Code
0
1
2
3
4
5
6
7
8
9
A
B
C
D
E
F
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