Mitsubishi Electric MELIPC MI5000 Series User Manual page 214

Cyclic data cannot be read correctly
Regardless of if the CC-Link IE Field Network Basic diagnosis transmission status is in transmission, if cyclic data cannot be
correctly read, then check the following items.
Confirm CC-Link IE Field Network Basic
Check the following items.
Check item
In the following settings, is a slave station set as a reserved station?
• [Basic Parameters]  [External Device Connection Settings]  [CC-Link
IEF Basic Settings]  [Network Configuration Settings]
Has the accumulated timeout count for the slave station thought to be faulty
*1
been reached?
Has the accumulated disconnection detection count for the slave station
thought to be faulty been reached?
Is there a user program that accesses a link device?
*1 The slave station accumulated timeout count and the accumulated disconnection detection count can be checked with 'Diagnosis
information 1 - Accumulated timeout count' (U3E0\G4647) and 'Diagnosis information 1 - Accumulated disconnection detection count'
(U3E0\G4648). ( Page 282 List of Buffer Memory)
APPX
212
Appendix 1 Troubleshooting by Symptom
*1
Corrective action
Cancel reserved station specifications of slave stations.
Page 213 Transmission status repeats disconnection and reconnection
Check the user program that accesses a link device area in the basic function
area, and review the address to access.