Siemens Simatic 620 - Manual (Page 128)

Error Diagnosis
6-8
SIMATIC Box PC 620 Manual
A5E00131465-01
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 BBB BBB B Beeps
2 8 Hexadecimal code
Check system memory Meaning
Special codes
In addition to the subsequent beep codes listed, there are the following special
codes:
3x short If the INSERT button is pressed during system start:
the Onboard Device Installation is skipped. The Onboard
Graphics is used as standard output.
1x long 8x short Error occurs when reading the MPI system information:
please turn to your customer support.
4x short MPI EPROM is programmed for the first time.
1x long 5 x short Ethernet Error: please turn to your customer support.