Mitsubishi MELSEC-Q Series User Manual page 137

4
FUNCTIONS
(b) How to determine link device refresh cycle
Calculation of total link devices refresh time
(This section 1))
(This section (1))
Temporary setting of link device refresh cycle
(This section 2))
(This section (2))
Test run of C Controller system (This section (3))
C Controller system operation check
System specifications* satisfied?
Determination of link device refresh cycle
Determine the link device refresh cycle by the following flowchart.
(This section 3))
(This section 4))
(This section (4))
YES
* The system specifications cover the whole system operations including functions
and processing required for the C Contoroller system and processing, functions
and performance of the user program.
Figure 4.49 Flowchart for link device refresh cycle setting
1) Calculation of total link devices refresh time
Calculate the total link devices refresh time.
( Section 4.5.5 (2))
2) Temporary setting of link device refresh cycle
The link device refresh cycle and the total link devices refresh time obtained in
1) must satisfy the following relational expression.
Set a tentative link device refresh cycle value that satisfies the following
relational expression.
[Relational expression]
Total link devices refresh time < Link device refresh cycle
* 1 When the C Controller module (host CPU) controls a MELSECNET/H module and a CC-Link IE
controller network module, consider the total link devices refresh time of the MELSECNET/H and
CC-Link IE controller networks to satisfy the following relational expression.
[Relational expression]
(TLDRT + TLDRT
MNETH CC-Link IE Control
TLDRT : Total link device refresh time for MELSECNET/H
MNETH
TLDRT : Total link device refresh time for CC-Link IE controller network
CC-Link IE Control
4.5 CC-Link IE Controller Network Module Access Function
NO
Corrective action for C Controller system malfunction
(This section 5))
(This section (5))
(Re-setting of link device refresh cycle)
*1
) < Link device refresh cycle
4.5.4 Link device refresh setting
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