YASKAWA MP900 Series User Manual page 70

Locations to Check
Problem
Indicator
No DeviceNet MS lit green
communications
NS not lit
(cont'd)
MS lit green
NS flashing
green
MS lit green
NS flashing
red
Communica-
MS lit green
tions are occur-
NS lit green
ring but the
maximum com-
munications
cycle time
exceeds the set-
ting.
Table 6.4 Troubleshooting the Master (Cont'd)
Status I/O Status
1040 - Communica-
tions power
supply error
0002 0000
2004 0000 Connection not
established
with DeviceNet
device
4004 404D I/O sizes of
each DeviceNet
device are dif-
ferent from set-
ting.
4004 404E No response
from
DeviceNet
device.
4004 4056 DeviceNet
device is idle.
8004 8000 Too much traf-
fic on
DeviceNet. The
communica-
tions cycle time
setting is too
low for the I/O
command send
time.
6-9
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Probable
Cause
1. Check the wiring and connections for
DeviceNet cables and connectors.
2. Check the power supply voltage and connection
for communications power supply.
3. Check the communications power supply
voltage for each DeviceNet connector on the
260IF Module (11 to 24V).
1. Check the wiring and connections for
DeviceNet cables and connectors.
2. Check the baud rate for each DeviceNet device
in the network.
3. Check the terminator (121 Ω) and connection
status.
4. Check the operation status of DeviceNet
devices on the network.
5. Replace the 260IF Module.
Set the I/O allocations.
1. Change the I/O sizes for the I/O allocations.
2. Change the I/O sizes for the DeviceNet device.
1. Check the wiring and connections for
DeviceNet cables and connectors.
2. Check the baud rate for each DeviceNet device
in the network.
3. Check the power supply status of DeviceNet
devices on the network.
Remove the cause of the idle status of the
DeviceNet device.
Set a longer communications cycle time.
6.4 Troubleshooting
Possible Solution
6