<2. Basic Design and Function Design>
● FCN-500 Operation and Precautions Regarding Duplexed Control
Network
For details on the operation specification and precautions applicable to a
STARDOM system configured with duplexed control network, see:
Section D2.2.2, “Control Network Duplexed Configuration” of IM “STARDOM
FCN/FCJ Guide”
Section 2.6 "Duplexing Control Network" of TI “STARDOM Network
Configuration Guide”
• Diagnostic communication interval
In a duplexed control network, diagnostic frames are transmitted periodically
through multicast communication.
If two successive diagnostic frame transmissions are unsuccessful, system
network failure is assumed, and control network switchover is performed.
One diagnostic frame is transmitted and one receive processing is performed
for each duplexed device within each cycle. When there are many duplexed
devices, the CPU load increases proportionally due to increased receive
processing of diagnostic frames. The diagnostic communication interval is
defined as 500 ms by default and can be lengthened as appropriate if many
duplexed devices are present on the network.
SEE ALSO
For details, see Section 2.6.1, “The Duplexed Network Function Provided on STARDOM” of TI
“Network Configuration Guide.”
● Operation and Precautions Regarding Duplexed Communication
Application
To implement duplexed communication with non-STARDOM equipment such
as FA-M3, third-party PLCs, and remote I/O, a communication application
must include logic for executing a transmission path switchover when a
communication error is detected.
SEE ALSO
For more details, see Section 2.6.2, “Duplexing Communications Using an Application” of TI
“Network Configuration Guide.”
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