Factors For Prolonged Scan Time - Mitsubishi Electric MELSEC Q Series User Manual

5.2 Factors for prolonged Scan Time

The processing time in Multiple CPU Systems is prolonged in comparison with Single CPU Systems when the
following functions are used.
When using the following, add the values described later to the values calculated in Section 5.1.
• Auto refresh of CPU shared memory (including multiple CPU high speed transmission function)
• Refresh of CC-Link IE controller network
• CC-Link automatic refresh
(1) Auto refresh of CPU shared memory (including multiple CPU high speed
transmission function)
(a) Auto refresh of shared memory
The amount of time required to perform the refresh function set up with the Multiple CPU settings/multiple CPU
high speed transmission area setting.
This value is the total amount of time required for writing into the host CPU's CPU shared memory, and the time
required for reading from other CPUs' CPU shared memories.
These values are added when setting up the refresh settings/multiple CPU high speed transmission area
setting with the PLC parameter "Multiple CPU settings."
Basic
Note5.1
For details of the CPU modules applicable to CC-Link IE controller network, refer to Section 2.4.
5 - 3
High
Process
performance
and MELSECNET/Híç1
Note5.1