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

5
PROCESSING TIME OF QCPU IN MULTIPLE CPU
SYSTEM

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
Sections 5.1.
High
Performance
Note5.1 Note5.1
(1) Auto refresh of CPU shared memory (including multiple CPU high speed
Basic
Process
Note5.2
Note1
Note1
High
Performance
Note5.1
Basic
Process
Note5.2
5
- 3 5.2 Factors for prolonged Scan Time
• Auto refresh of CPU shared memory (including multiple CPU high speed
transmission function)
• Refresh of CC-Link IE controller network
• CC-Link automatic refresh
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."
The CC-Link IE controller network can only use the High Performance model QCPU whose first 5
digits of serial No. is 09012 or later.
The CC-Link IE controller network cannot use the Basic model QCPU or the Process CPU.
Note5.1, Note5.2
and MELSECNET/H