Toshiba GR200 Series Instruction Manual page 483

Supervision of check-sum error (SUM error)
9.2.2
The check sum in the memory on the CPU module is verified every four minutes; when the
error is found the error message is displayed by the supervision function.
Error level
(i)
The error level has been set at level 1 (Serious error) for the supervision, the check-sum error
on the memory is carried out periodically. If the error is detected, the IED restarts its operation
automatically. The supervision function runs on the CPU module
is made promptly when the error is cleared.
Note: The CPU module is discussed in Chapter
1
and communication module: Processing module.
Error message
(ii)
When detecting an error, an error message can be shown on the LCD screen and an LED is lit.
Table 9.2-4 Error messages provided by the supervisor in CHK_SUM
Message and level
CP*_ (SUM) error
Error level
Table 9.2-5 Detailed information in Hexadecimal in CHK_SUM
Display
area
Top
00000001: Read error in ROM
00000002: Sum incorrect in ROM RAM
row
Middle
Sum value pre-programmed
row
Bottom
(No information displayed)
row
Sum error in the memory detected on the following module:
CP1M:
Serious error (Level 1)
Meaning of the detailed information
Left column
- 469 -
Technical description: Signal processing
Meaning of the information
CPU module
Right column
Sum value calculated
Address information that read error occurs
in the ROM
(No information displayed)
6F2S1931 (0.20)
. Clearing the error message
1
Centralized GRB200
(Soft: 030, 031, 032, 033, 034)