Computing Unit Self-Test Prior To Booting - Siemens SIMATIC PC 670 Equipment Manual

Fault Diagnosis
6.8

Computing Unit Self-Test Prior to Booting

After switching on the SIMATIC PC a self-test is initiated (POST = Power On Self
Test). If errors are detected during the POST, the corresponding sequence of
POST beeps (beep code) are issued. Each beep code consists of 2 x 2
sequences.
In addition, the individual test steps which the self-test executes, are issued on the
I/O port 80h.
Conversion table for the beep codes to hexadecimal representation:
BBBB
BBBB
BBBB
BBBB
Example
B
2
Test system memory
Special codes
In addition to the beep codes listed below, there are also special codes:
3x short
1x long 8x short
4x short
1x long 5x short
6-8
Beeps
B
B
B
B
BB
BB
BB
BB
BBB
BBB
BBB
BBB
BBB BBB B
8
INSERT button has been pressed during the system start:
The Onboard Device Installation is skipped. The Onboard
Graphic is used as the standard output.
Fault reading the MPI system information:
Contact your technical service department.
MPI EPROM was programmed for the first time.
Ethernet error: Contact your technical service department.
B
BB
BBB
BBBB
B
BB
BBB
BBBB
B
BB
BBB
BBBB
B
BB
BBB
BBBB
Beeps
Hex Code
Meaning
Panel PC 670 Computing Unit, Equipment Manual
Release 04/02
Hex Code
0
1
2
3
4
5
6
7
8
9
A
B
C
D
E
F