Protective and Diagnostic Functions
7-9
OPERA-
TOR ERR
RAM
CHECK
ERR
Operator Error (Internal RAM
Fault)
At power ON, an error was detected
from the results of the internal RAM
Write/Read check.
---
Replace the Operator.
OPERA-
TOR ERR
ROM
CHECK
ERR
Operator Error (CPU Internal ROM
Fault)
At power ON and during operation, an
error was detected when the internal
ROM was checked.
OPERA-
TOR ERR
DATA
SEND
ERR
Operator Error (Transmission Cir-
cuit Fault)
During operation, send processing did
not complete within 500 ms continu-
ously at least 10 times.
OPERA-
TOR ERR
RAM
CHECK
ERR
Operator Error (Internal RAM
Fault)
During operation, an error was
detected when the display pattern for
the character code 80 to 8F recorded
in the internal RAM was checked.
OPERA-
TOR ERR
WAT C H-
DOG ERR
Operator Error (Watchdog Error)
During operation, an error was
detected in the program execution.
Table 7.1 Fault Displays and Processing (Continued)
Display Meaning Probable Causes Corrective Actions
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