Alarm, error and system messages
12.2 BIOS POST codes
SIMATIC Rack PC 840 V2
Operating Instructions, Edition 05/2006, A5E00248055-04
12-3
12.2
12.2
BIOS POST codes
The following section lists the POST codes relevant to users in the sequence in which they
occur: Contact Customer Support for all other POST codes.
Display
(hex)
Meaning
Description
Remedy
16H
TP_CHECKSUM
BIOS checksum test
Service event
28H
TP_SIZE_RAM
Determine DRAM size
Replace memory modules
2AH
TP_ZERO_BASE
Set base RAM 64KB to 0
Replace memory modules
2CH
TP_ADDR_TEST
Check address busses
Replace memory modules
2EH
TP_BASERAML
BaseRam Low
Replace memory modules
30H
TP_BASERAMH
BaseRam High
Replace memory modules
38H
TP_SYS_SHADOW
BIOS is copied to DRAM
Replace memory modules
3AH
TP_CACHE_AUTO
Determine CPU cache
Exchange CPU
22H
TP_8742-TEST
Test keyboard controller
Check if keyboard is connected or
defective
3CH
TP_ADV_CS_CONFIG Configure the advanced
chip set
Test by switching off the hardware
components in Setup
49H
TP_PCI_INIT
Initialize the PCI interface
Test by switching off the hardware
components in Setup or removing
installed expansion modules from
the bus module
55H
TP_USB_INIT
Activation of the USB
hardware
Removal of USB devices
4AH
TP_VIDEO
Initialize the video interface
5CH
TP_MEMORY_TEST
Test of the system memory Replace memory modules
60H
TP_EXT_MEMORY
Test of the complete
memory
Replace memory modules
62H
TP_EXT_ADDR
Test of the address busses Replace memory modules
90H
TP_FDISK
Initialization and test of the
hard disk hardware
Disconnect hard disk, replace if
necessary
95H
TP_CD
Initialization and test of the
CD hardware
Disconnect CD ROM, replace if
necessary
98H
TP_ROM_SCAN
Search for BIOS
expansions
Test by switching off the hardware
components in Setup or removing
installed expansion modules from
the bus module
BCH
TP_PARITY
Test of the memory
modules
Replace memory modules
00H
BIOS Power On Self Test
completed. Loading
operating system