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Error Details and Measures Section 13-2
Additional Information
Errors related to the Memory Cassette are not saved in the error log in the
G9SP-series Controller's internal nonvolatile memory. Read and check the
error before cycling the power supply.
13-2-2 Non-fatal Errors
Expansion I/O Unit Errors
Program Execution Errors
Option Board Communications Errors
Safety I/O Function Errors
If an error is detected in the self-diagnosis functions of Safety Input terminals,
the ERR/ALM indicator on the G9SP-series Controller will flash red, and the
relevant Safety I/O terminal indicator will light red or flash red.
Error name Probable cause Action
Expansion I/O Unit
configuration mis-
match
The system started with a configuration different
from configuration set using the G9SP Configu-
rator.
With the power supply OFF, adjust the system to
the proper Unit configuration, and then turn ON
the power supply again.
Expansion I/O bus
error
Failure occurred when refreshing the Expansion
I/O Unit. (The failure was the result of Expansion
I/O Unit failure, improper contact, or noise inter-
ference.)
With the power supply OFF, check the connec-
tion to the Expansion I/O Unit. If the error occurs
again, replace the Expansion I/O Unit or take
measures against noise.
Error name Probable cause Action
Function block status
error
A logic error was detected in function block exe-
cution.
Refer to the G9SP-N@@@ Safety Controller
Instructions Reference Manual (Cat. No. Z923).
Error name Probable cause Action
Option Board com-
munications error,
communications tim-
eout
A timeout was detected in communications
through the Option Board. (This includes discon-
nected communications cable, Option Board fail-
ure, improper contact, noise interference,
communications partner failure, or communica-
tions partner status change.)
With the power supply OFF, check the connec-
tion to the Option Board. If the error occurs
again, replace the Option Board, take measures
against noise, or check the remote connection.
Option Board com-
munications error,
not mounted
The Option Board became loose after startup. With the power supply OFF, check the connec-
tion to the Option Board, and then turn ON the
power supply again.
Flashing green/lit green
Flashing red
ERR/ALM
MS
I/O LED 0 1 2 3 4 5 6 7 8 9
The I/O indicator of the terminal where the
error was detected will light or flash red.
MEMORY
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