Mitsubishi Electric Q12DCCPU-V User Manual page 207

5
ACCESS VIA NETWORK MODULES
5) When the C Controller system is malfunctioning
In the case of C Controller system malfunction or faulty user program
processing performance, take actions 1 to 3 if necessary to correct the system
operation.
[Action 1: Increase the link device refresh cycle setting value.]
Check the total link device refresh time (Max.) measured during C Controller
system operation, in "Link device refresh time (Max.)" in the <<Module
information>> tab of either of the following utilities.
• CC IE Control utility
• MELSECNET/H utility
Re-set a link device refresh cycle appropriate to the confirmed link device
refresh time (Max.) so that the following relational expression is satisfied.
Also, since the C Controller system specifications must be satisfied, determine
the link device refresh cycle, taking into account the user program processing.
[Relational expression]
Measured link device refresh time (Max.) value < Link device refresh cycle
C Controller
module processing
<Before taking
action>
<After taking
action>
[Action 2: Decrease the refresh points.]
Check the refresh parameters and decrease the number of refresh points to
reduce the total link device refresh time. (
C Controller
module processing
<Before taking
action>
<After taking
action>
5.4 CC-Link IE Controller Network Module Access Function
Link device
refresh cycle
Total link device refresh time
Figure 5.50 Corrective action 1
Page 5-62, Section 5.4.5 (3))
Link device
refresh cycle
Total link device
refresh time
reduced
Total link device refresh time
Figure 5.51 Corrective action 2
5.4.4 Link device refresh setting
Increase link
device refresh
cycle.
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