Mitsubishi Electric MELSEC iQ-F FX5 User Manual page 99

Server certificate generation time
Time required for FX5-OPC to generate a server certificate depends mainly on the following two factors:
No. Item
1 Key length selected in OPC UA Module
Configuration Tool
2 Load on an FX5-OPC responding to OPC UA
clients
Note that due to characteristics of the RSA key generation algorithm, the generation time is not deterministic even when
generating a certificate when the OPC UA server function is stopped.
■Measurement example
The following shows measurement results when generating a certificate with an FX5-OPC which was not connected to any
clients.
Selected key length
1024 bits
2048 bits
3072 bits
4096 bits
Remarks
The larger a key length (bits) is, the longer it takes to generate a certificate.
Monitoring hundreds of variables through OPC UA subscriptions with small sampling rates (less
than one second) results in the high load on an FX5-OPC; therefore, it takes longer to generate a
certificate.
For a certificate with a 4096 bit key, the generation may take approximately 12 hours.
To minimize the certificate generation time, it is recommended to stop the OPC UA server function
before starting the generation.
Approximate certificate generation time
5 to 10 seconds
30 to 60 seconds
1 to 3 minutes
5 to 15 minutes
Appendix 5 Performance Considerations
A
APPX
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