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Supervision of check-sum error (SUM error)
10.2.2
Memory check sum is verified every four minutes in the CPU. When an 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) in the automatic supervision. The check-
sum is monitored periodically. If the error is detected, the IED automatically restarts the
operation. The supervision function runs at CPU module
promptly when the error is solved.
Note: It is discussed in Chapter
1
communication module
Error message
(ii)
When detecting an error, the error message will be shown on the LCD screen. LED will be lit
up.
Table 10.2-3 Error messages provided by the supervisor in CHK_SUM
Message and level
CP*_ (SUM) error
Error level
Table 10.2-4 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
Technical description: Signal processing and
(→p. 645)
Sum error in the memory detected on the following module:
CP1M:
Serious error (Level 1)
Meaning of the detailed information
Left column
- 803 -
. The error message will be cleared
1
.
Meaning of the information
CPU module
Right column
Sum value calculated
Address information that read error occurs
in the ROM
(No information displayed)
6F2T0207 (0.01)
GRE200 (5,6)
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