100
10.4 Alarm Description and Cause/Action
(1) Message level alarms
Code Error
name
Cause/Action
40 Emergency stop
Cause: An emergency stop condition was detected.
(This is not an error.)
41 Motor voltage drop
Cause: The “external cutoff relay” controller detected a motor drive-
power cutoff condition where the MPI and MPO terminals are
open.
(This is not an error.)
(Note) If this alarm generates when the MPI and MPO terminals are
closed, an internal failure of the controller is suspected.
5A Reception
overrun
5B Reception framing error
5D Header
error
5E Delimiter
error
7F BCC
error
This alarm indicates an error during PC or teaching pendant operation
or in the serial communication using the PLC’s communication module.
Cause: (1) Garbage data due to the effect of noise
(2) Duplicate slave numbers when multiple controllers are
controlled by serial communication
Action: (1) Adjust the wiring in a manner eliminating the effect of noise
and review the installation of equipment, etc.
(2) Change the slave numbers to avoid duplication.
61 FNCCHR,
W
address
error
62 Operand 1 error
63 Operand 2 error
64 Operand 3 error
This alarm indicates an error in the serial communication using the
PLC’s communication module.
Cause: Undefined command or out-of-range data
Action: Review the transmitted data and correct the format.
65 EEPROM write timeout
Cause: Writing of parameter or position data to the nonvolatile memory
area does not complete within 200 ms.
(This alarm will not generate in normal operation.)
Action: Do not write data from the PC or teaching pendant
simultaneously while a command is being issued from the PLC.
70 Movement
command
during RUN-OFF
Cause: A movement command was issued while the servo was OFF.
Action: Issue a movement command after confirming that the servo is
ON (SRDY or PEND is ON).
73 Error reset during servo
ON
Cause: An alarm reset command was sent while the servo was ON
during an operation by serial communication.
(PIO commands are excluded.)
Action: Send an alarm reset command after confirming that the servo
is OFF.
75 Movement
command
during home return
Cause: The next movement command was issued during home return.
Action: Issue the next movement command after confirming that the
home return has completed (HEND is ON).
76 Soft reset during servo
ON
Cause: A soft reset command was sent while the servo was ON during
an operation by serial communication.
(PIO commands are excluded.)
Action: Send a soft reset command after confirming that the servo is
OFF.
