Mitsubishi MELSEC Q Series User Manual

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4.4 MELSECNET/H Module Access Function
4.4.4 Link device refresh setting
4
FUNCTIONS
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.
[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. ( Section 4.4.5 (3))
Figure 4.24 Action 1) for malfunction
Figure 4.25 Action 2) for malfunction
[Relational expression]
Measured link device refresh time (Max.) value < Link device refresh cycle
<Before taking
action>
C Controller
module processing
Increase link
device refresh
cycle
Total link devices refresh time
Link device
refresh cycle
<After taking
action>
Total link devices refresh time
Link device
refresh cycle
C Controller
module processing
<Before taking
action>
<After taking
action>
Total link devices
refresh time is
reduced.

Mitsubishi MELSEC Q Series Specifications

General

Brand	Mitsubishi
Model	MELSEC Q Series
Category	Controller
Language	English