Variation In Total Link Device Refresh Time; Checking The Total Link Device Refresh Time - Mitsubishi Electric Q12DCCPU-V User Manual

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ACCESS VIA NETWORK MODULES
Total link device refresh time during
C Controller system operation
5
- 22 5.3 MELSECNET/H Module Access Function
5.3.4 Link device refresh setting

3) Variation in total link device refresh time

The total link device refresh time varies depending on the operating conditions
of the C Controller system.
It may take a longer time if the interrupt processing or high-priority task
processing, such as the following, is activated during link device refresh.
• Shell command
• Workbench/Tornado connection
• File access
• Mount/unmount of a CompactFlash card
• Ethernet communications
• NFS server communication
• Processing of a bus interface driver
Link device
refresh cycle
C Controller
module processing
Link device
refresh
Link scan
Figure 5.19 Variation in total link device refresh time
* 1 Functions to transmit with peripheral devices, functions to communicate with an intelligent function
module, etc.

4) Checking the total link device refresh time

The total link device refresh time during operation of the C Controller system
can be checked in "Link device refresh time (Max./Min./Current)" in the
<<Module information>> tab of MELSECNET/H utility.
*1
Total link device
refresh time
increased
High-priority task
processing
Link device refresh processing
Figure 5.20 Link device refresh time
Interrupt
processing