Station Is Repeatedly Disconnected And Reconnected; Communication Is Unstable - Mitsubishi Electric QJ71GF11-T2 User Manual

12.4.4

Station is repeatedly disconnected and reconnected

The following lists the troubleshooting actions to be taken when a station in data link is repeatedly disconnected and
reconnected.
Check item
Are 1000BASE-T-compliant Ethernet cables used?
Is the station-to-station distance 100m or less?
Does the cabling condition (bend radius) meet the
specification?
Is any Ethernet cable disconnected?
Is the switching hub normal?
If the above actions do not solve the problem, perform the following tests on the master/local module to check for an
error.
• Hardware test (
• Self-loopback test (
• Cable test (
12.4.5

Communication is unstable

The following lists the troubleshooting actions to be taken when link scan time or transmission delay time is long or
when a transient transmission timeout occurred.
Check item
Is the L ERR. LED of the master or slave station off?
Is the ambient temperature for the module within the specified
range?
Is any error shown in "Selected Station Communication Status
Monitor" of CC-Link IE Field Network diagnostics?
Is there any noise affecting the system?
If the above actions do not solve the problem, perform the following tests on the master/local module to check for an
error.
• Hardware test (
• Self-loopback test (
• Cable test (
436
Replace the cables with 1000BASE-T-compliant Ethernet cables.
(
Change the station-to-station distance to 100m or less.
Refer to the manual for the Ethernet cable, and correct the bend radius.
Replace the Ethernet cable.
Power on the switching hub.
Page 64, Section 6.2.1)
Page 66, Section 6.2.2)
Page 78, Section 6.4.2)
If the L ERR. LED is on or flashing, perform troubleshooting.
(
Keep the ambient temperature within the specified range by taking
action such as removing heat source.
If an error is identified at PORT1 or PORT2, perform a cable test and a
self-loopback test.
Check the wiring condition.
Page 64, Section 6.2.1)
Page 66, Section 6.2.2)
Page 78, Section 6.4.2)
Action
Page 59, Section 5.3.1)
Action
Page 432, Section 12.3 (6)