Siemens C79000 Z7076 C638 04 - Manual (Page 57)

Error Diagnosis and Reinstallation
6-7
SIMATIC Box PC 620 Operating Manual
C79000-Z7076-C638-04
6.8 Diagnostic Messages (Port 80)
When the SIMATIC 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. Each beep code consists of 2 x 2 sequences.
In addition, the individual self-test steps are output at I/O port 80h.
Conversion table for the beep codes to hexadecimal representation:
Beeps 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:
B BBBB BBB BBB Beeps
3 6 Hexadecimal code
Check shutdown code Meaning