Siemens PC 670 Computing Unit Self-Test Prior to Booting, Special codes, Beeps Hex Code, Example

Fault Diagnosis Release 04/02

6.8Computing 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:

			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			Hex Code
		Test system memory				Meaning

Special codes

In addition to the beep codes listed below, there are also special codes:

3x short	INSERT button has been pressed during the system start:
	The Onboard Device Installation is skipped. The Onboard
	Graphic is used as the standard output.
1x long 8x short	Fault reading the MPI system information:
	Contact your technical service department.
4x short	MPI EPROM was programmed for the first time.
1x long 5x short	Ethernet error: Contact your technical service department.

6-8 Panel PC 670 Computing Unit, Equipment Manual