FAQ: What are the differences between MECHATROLINK-II and MECHATROLINK-III?
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These differences mean that while MECHATROLINK-III performs better, the motion programmer must be more thoughtful in choosing a network topology and configuring the network.
With MECHATROLINK-III, the time it takes for a master to send a packet to a slave and receive the slave's reply is called the response time, and it depends on the number of intermediate slave nodes, the packet size and the sum of the cable lengths. The sum of the response times for each slave and the number of retries configured determines the minimum communication cycle. Consequently, for the same number of nodes, a star topology will have a lower minimum communication cycle than a line topology.
The network configuration for MECHATROLINK-III contains the expected response times for each slave node, the number of retries and the communication cycle. As a result, the network configuration depends on how the slave nodes are physically connected. Changing the physical connection without updating the configuration may cause the controller to be unable to communicate with a slave node. The motion programmer can increase the expected response times to allow the system to work with different topologies, but doing so may result in a slower communication cycle.
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