12   Troubleshooting and Maintenance
12 - 18
GX-series EtherCAT Slave Unit User’s Manual
Event name I/O Disconnection Detected Event code 64CC0000 hex
Meaning An I/O signal line is disconnected.
Source EtherCAT Master Function Module Source details Slave Detection 
timing
Continuously 
after 
communications 
are established
Error attributes Level Minor fault Recovery Error reset (after 
resetting Slave 
Unit errors)
Log category System
Effects User program Continues Operation The relevant I/O will not operate.
LED EtherCAT NET RUN EtherCAT NET ERR EtherCAT LINK/ACT
--- Flashes at 1-s intervals. ---
System-defined 
variables
Variable Data type Name
None --- ---
Cause and 
correction
Assumed cause Correction Prevention
I/O signal wiring is disconnected or 
has a faulty connection.
Connect the I/O signal wiring 
securely.
Connect the I/O signal wiring 
securely. Check for vibration and 
shock.
An I/O signal line is disconnected. Replace the I/O signal line. None
Attached 
information
Attached information 1: Detected channel (for Analog I/O Unit)
Precautions/
Remarks
The emergency error code is 2130 hex.
Event name Slave Unit Verification Error Event code 84A00000 hex
Meaning A verification error occurred for the SII.
Source EtherCAT Master Function Module Source details Slave Detection 
timing
When 
establishing 
communications 
after turning ON 
power to the 
Slave Unit
Error attributes Level Minor fault Recovery Error reset (after 
cycling Slave Unit 
power)
Log category System
Effects User program Continues Operation The Slave Unit where the error occurred does not go to 
Pre-operational state.
LED EtherCAT NET RUN EtherCAT NET ERR EtherCAT LINK/ACT
--- --- ---
System-defined 
variables
Variable Data type Name
None --- ---
Cause and 
correction
Assumed cause Correction Prevention
An error occurred in the control 
board.
If cycling the power supply does not 
correct the problem, replace the 
Slave Unit.
None
Attached 
information
None
Precautions/
Remarks
The emergency error code is 6140 hex.