Siemens PANEL PC 877 User Manual
Alarm, error and system messages
13.2 Introduction to the BIOS beep codes
SIMATIC Panel PC 877
Operating instructions, Release 07/2006, A5E00877780-01
Operating instructions, Release 07/2006, A5E00877780-01
13-3
13.2
13.2
Introduction to the BIOS beep codes
The device performs a self-test when it is switched on. If an error is detected during the
POST (Power On Self Test), a series of beep signals are issued. The beep tones are a code
for errors and are composed of 2 x 2 sequences.
Table 13-1 Converting the beep codes in a Hex display
Beep tones
Hex code
B
B
0
B
BB
1
B
BBB
2
B
BBBB
3
BB
B
4
BB
BB
5
BB
BBB
6
BB
BBBB
7
BBB
B
8
BBB
BB
9
BBB
BBB
A
BBB
BBBB
B
BBBB
B
C
BBBB
BB
D
BBBB
BBB
E
BBBB
BBBB
F
Example
Tone sequence
B
BBB
BBB
B
Hex code
2
8
Meaning
Determine RAM size