Siemens SIMATIC PANEL PC 877 - Manual (Page 163)

Alarm, error and system messages
13.2 Introduction to the BIOS beep codes
SIMATIC Panel PC 877
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