Yaskawa 260IF DeviceNet System - Manual (Page 70)

Network Maintenance
6.4.1 Masters
6-10
6
Table 6.5 Troubleshooting the Master (Cont’d)
Problem
Locations to Check
Probable
Cause
Possible Solution
Indicator Status I/O Status
Communica-
tions are occur-
ring but the
receive data
refresh is
delayed. MS lit green
NS lit green 8004 8000 Too much traf-
fic on
DeviceNet.
The communi-
cations 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. 1. Set a longer communications cycle time.
2. Reduce the baud rate.
3. Increase the setting of the CPU scan time for
the I/O allocation SCAN setting.
MSG-SND func-
tion terminated
due to error.
(during
DeviceNet com-
munications) MS lit green
NS lit green 8004 8000 Parameter set-
ting error Check that the MSG-SND function parameter set-
tings are correct.
• Data address
• Data size
MS lit green
NS flashing
green 2004 - EM allocations
not made. Set the EM allocation under I/O Allocations.
MS lit green
NS lit red 4004 40XX I/O communi-
cations error Remove the cause of the I/O communications error.
MSG-SND func-
tion remains
BUSY and does
not end. MS lit green
NS lit green 8004 8000 MSG-SND
function
parameter set-
ting error Check that the MSG-SND function parameter set-
tings are correct.
• Remote station number
Too much traf-
fic on
DeviceNet
(Cannot send
Explicit request
message.) 1. Set longer communications cycle time.
2. For multi-Master configuration, increase the
communications cycle time for other Master.