Error History Monitor - Mitsubishi Electric MELSEC iQ-R Series User Manual

Error History Monitor

From this window, the occurrence condition of the forward/reverse loop error, communication error, and transient transmission
error can be checked.
Error history details and error histories can also be cleared from here.
Item
Network Information
F. Loop Retry Count
R. Loop
Circuit Error
UNDER
CRC
OVER
SHORTFRAME
ABORT
TIMEOUT
Exceeding 2KB
DPLL ERROR
Loop Switching Count
Transient Transmission Errors
[Error History Detail] button
[Clear Error History] button
The number of occurrences of each error does not cause any problem unless the count value rises frequently
during operation.
Take the following actions if the count value rises frequently:
• Check the power on or off status of the own station and other station.
• Check the cable and connector status (removal and loosening of connectors, cable disconnection, and
cable length).
• Perform self-loopback test, internal selfloopback test, and hardware test.
• Perform station-to-station test and forward/reverse loop test.
• Rewire the cable by referring to the wiring described in MELSEC iQ-R MELSECNET/H Network Module
User's Manual (Startup). Also, perform installation again by referring to the user's manual for the CPU
module used.
Description
Indicates the same information as own station information.
Indicates the number of retries (re-communication during communication
error).
Indicates the number of line errors.
Indicates the number of under-errors.
Indicates the number of CRC errors.
Indicates the number of overrun errors.
Indicates the number of short frame (message too short) errors.
Indicates the number of abort errors.
Indicates the number of timeout errors.
Indicates the number of reception errors of 2K bytes or more.
Indicates the number of DPLL errors.
Indicates the number of times loop switch occurs.
Indicates the number of transient transmission errors.
Opens the "Error History Monitor Details" window.
Opens the "Clear Error History Monitor" window.
Displayed information
Page 106 Host Station Information
• 0: No count
• 1 or greater: Cumulative count
Page 114 Error History Monitor
Details
Page 115 Clear Error History
Monitor
4 TROUBLESHOOTING
4.3 Checking the Network Status
4
113