Operating instructions

Alarm, error, and system messages
13.2 Introduction to the BIOS beep codes
SIMATIC Panel PC 677B
Operating Instructions, 05/2007, A5E01035609-01
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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