Mitsubishi MELSEC-Q Series User Manual page 102

4
FUNCTIONS
4
- 29
4.4 MELSECNET/H Module Access Function
4.4.4 Link device refresh setting
5) Corrective action for C Controller system malfunction
In the case of C Controller system malfunction or faulty user program
processing performance, take actions 1) to 3) as necessary to correct the
system operation.
[Action 1: Increase the link device refresh cycle setting value.]
Check the measured value of the total link devices refresh time (Max.)
during C Controller system operation at "Link device refresh time (Max.)" on
the <<Module information>> tab of the MELSECNET/H utility.
( Section 9.4.2)
Re-set the link device refresh cycle so that the following relational
expression is satisfied.
Since the C Controller system specifications must be also 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.]
Reexamine the refresh parameters and decrease the number of refresh
points to reduce the total link devices refresh time. (
C Controller
module processing
<Before taking
action>
<After taking
action>
Link device
refresh cycle
Total link devices refresh time
Figure 4.24 Action 1) for malfunction
Link device
refresh cycle
Total link devices
refresh time is
reduced.
Total link devices refresh time
Figure 4.25 Action 2) for malfunction
Increase link
device refresh
cycle
Section 4.4.5 (3))