YASKAWA MP900 Series User Manual page 74

Locations to Check
Problem
Indicator
No DeviceNet MS lit green
communications
NS flashing
(cont'd)
red
MS lit green
NS flashing
red
MS lit green
NS lit green
Communica- MS lit green
tions are occur-
NS lit green
ring but the
receive data is
not being
refreshed.
Communica- MS lit green
tions are occur-
NS lit green
ring but the
receive data
refresh is
delayed.
Table 6.8 Troubleshooting Slaves (Cont'd)
Status I/O Status
4004 4000 No response
from
DeviceNet
Master
0000 0004 The switch
MAC ID set-
ting is different
from the MAC
ID setting
under the I/O
allocations.
0000 0004 The switch
MAC ID set-
ting is different
from the MAC
ID setting
under the I/O
allocations.
8004 8003 DeviceNet
Master is in
idle status.
8004 8003 Too much traf-
fic on
DeviceNet. The
communica-
tions cycle time
setting is too
low for the I/O
response
receive time.
The processing
load for data
exchange with
the PLC is too
large.
6-13
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Probable
Cause
1. Check the wiring and connections for
DeviceNet cables and connectors.
2. Check the baud rate for each device.
3. Check the terminator (121 Ω) and connection
status.
4. Check the operation status of the DeviceNet
Master.
5. Check the power supply voltage and connection
for communications power supply.
6. Check the communications power supply
voltage for each DeviceNet connector on the
260IF Module (11 to 24V).
1. Change the MAC ID setting under the I/O allo-
cations.
2. Change the switch MAC ID setting and cycle
the power.
1. Change the MAC ID setting under the I/O allo-
cations.
2. Change the switch MAC ID setting and cycle
the power.
Remove the cause of the idle status of the
DeviceNet Master.
1. Increase communications cycle time for the
DeviceNet Master.
2. Reduce the baud rate.
3. Increase the CPU scan time for the I/O
allocation SCAN setting.
6.4 Troubleshooting
Possible Solution
6