Weed Instrument 2C31-LC-MM/MM Ring Module 仕様ガイド

Weed Instrument Fiber Optics

3

back to the point of origin. This communication method
employs a “Master” or ring control module which will direct
traffic and guard against duplicate message delivery. Each
fiber ring must include one master module to insure proper
communication between all nodes in the ring.

As shown in the Model 2C31 single ring diagram on

page 2, data enters the ring in the middle node. Primary
and secondary data flow in two separate directions around
the ring.

Primary data is defined as the data that arrives at the

module first. When a data packet flows around the ring, the
primary data is delivered to other ControlNet™ segments.
Secondary data will only be used in the case of fiber break.

For critical applications the Model 2C32 provides a highly

robust, dual-channel ControlNet™ solution. As with the 
single ring, Downstream Multicasting insures that data is
delivered to all consumers within the appropriate network
update time. In this configuration, not only is a second ring
provided to support both Channel A and B ControlNet data
packets, a third or tertiary communication path is also 
available. Because there is an additional path, more fiber
breaks are supported without any loss in either 
communication channel.

Because redundant systems are typically used in 

operations that can’t afford a loss in data or any downtime,
the 2C31 and 2C32 are supplied as standard with an 
extensive set of powerful diagnostic tools to warn against
any faults or impending system failures.