Siemens 620 appendix Diagnostic Messages Port, Special codes, Example, Beeps Hex-Code

Error Diagnosis

6.8Diagnostic 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.

6-8	SIMATIC Box PC 620 Manual
	A5E00131465-01