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Network Communication Module

With a model 4329 Network Communi-cation Module (NCM) installed, the Tricon can communicate with other Tricons and with external hosts over Ethernet (802.3) networks. The NCM supports a number of Triconex propri-etary protocols and applications as well as user-written applications, including those that use TSAA protocol.

The NCMG module has the same func-tionality as the NCM as well as the ability to synchronize time based on a GPS system. For more information, see the Tricon Communication Guide. The NCM provides two BNC connec-tors as ports: NET 1 supports Peer-to-Peer and Time Synchronization proto-
cols for safety networks comprised of Tricons only. NET 2 supports open networking to external systems using Triconex applications such as TriSta-tion, SOE, OPC Server, and DDE Server or user-written applications. See “Communication Capabilities” on page 59 for more information about Triconex protocols and applications.

Two NCMs can reside in one logical slot of the Tricon chassis, but they func-tion independently, not as hot- spare modules. External hosts can read or write data only to Tricon variables to which Alias numbers have been assigned. (See “Enhanced Intelligent Communication Module” on page 27 for more information about Aliases.)

The NCM is compatible with the IEEE 802.3 electrical interface and operates at 10 megabits per second. The NCM connects with external host computers by means of coaxial cable (RG58) at typical distances up to 607 feet (185 meters). Distances up to 2.5 miles (4,000 meters) are possible using repeaters and standard (thick-net or fiber-optic) cabling.

The main processors typically refresh data on the NCM once per scan.