Heinzmann PHLOX II IC-08 User Manual

14 Error Handling
218 PHLOX II Ignition Control System

RAM test
During this test, various binary patterns are written into the internal processor RAM
memory and read out again. If at least one cell does not contain the expected code it
is checked whether this RAM sector is used by the boot loader program itself. If so,
the boot loader program enters an endless loop and no communication with DcDesk
2000 is possible. If not, the communication to DcDesk 2000 becomes active and the
faulty RAM cell is indicated.

EEPROM test
This test checks existence of an EEPROM. If EEPROM could not be detected
DcDesk reports error 3011 ErrEEPROM and any further access to EEPROM will be
blocked.

Boot loader programme test
During this test, a check sum is calculated for the memory area containing the boot
loader program and compared with the check sum that pre-programmed at the facto-
ry. If the sums do not match, the boot loader programme will remain in an endless
loop, and no communication with DcDesk 2000 is possible.

Main program test
During this test, a check-sum is calculated over the memory area containing the main
programme and compared with the check sum pre-programmed at the factory. If the
sums do not match, the boot loader will go into a state which is indicated by the error
3012 ErrBootloader (MainCheckSum) via DcDesk 2000.

Watchdog triggering while main program is running
The boot loader passes into a state which is indicated in DcDesk 2000 as 3012
ErrBootloader (ExternWatchdog or InternWatchdog), as the case may be.
14.5.2 Boot loader communication with DcDesk 2000
Whenever the boot loader recognizes a situation that does not allow the main program
to start – either because there is no main program available or because a hardware
memory error has occurred – it is possible to establish a connection from DcDesk 2000
and to read out the cause of the error. The only exceptions are when neither the internal
nor the external watchdog respond (that would be a double fault), when the RAM re-
quired by the boot loader is faulty or when the boot loader program itself is inconsistent
(fails checksum test). In this case the program stays in an endless loop and a connection
is not possible. The following table shows the meaning of each indicated value:
The following parameters are not visible in the main program, only in the boot
loader.

Heinzmann PHLOX II IC-08 Specifications

General

Brand	Heinzmann
Model	PHLOX II IC-08
Category	Control Systems
Language	English