<2. Basic Design and Function Design>
● Recommended CPU Load
The following FCN-500 and FCN-RTU functions are executed during CPU idle
time:
- Ethernet communications of FCN-500 and FCN-RTU
- Communication with VDS/ASTMAC data server
- Inter- FCN-500 and FCN-RTU communication
- Various inter-device communications such as Modbus communications
using Ethernet or serial communications
- Operation or setup from Logic Designer or Resource Configurator
- Duolet function
- Downloading of boot project and source
To allow such processing, it is recommended that the CPU load be kept at 60% or
lower.
The CPU load calculation described in this section considers only the execution
time of the control application. In an actual system, execution time also includes
CPU module and I/O module access time. Therefore, consider a CPU load slightly
higher than the value estimated here.
The I/O module access time varies with the number of I/O modules and normally
ranges between several milliseconds to 20 milliseconds.
CPU load (%) ＝
ｘ 100 %
and Duolet functions
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