FCU 2165/2175 Reference Manual - Emerson Process Management

Rosemount Tank Radar REXReference Manual308018EN, Edition 3BSeptember 20071.3.2 Field InterfaceCarrier Moduleand FieldInterface ModuleThe Field Interface Carrier Module has 16 sockets which are designed toaccept a range of Field Interface Modules. The FCU 2175 can accommodate2 Field Interface Carrier Modules therefore providing a maximum of 32 serialchannels.The Field Interface Modules provide the electrical interface to the outsideworld. The following Field Interface Modules are available:• RS 232• RS 485• RS 422• Enraf ® Bi Phase Mark• Rosemount TRL/2• Whessoe ® Current LoopFigure 1-7. Field InterfaceCarrier Module equipped with 13Field Interface Modules (11Enraf ® Bi Phase Mark and 2Rosemount TRL/2).1.3.3 Field IsolationModuleThe Field Isolation Modules provide electrical isolation and transientprotection to the FCU 2175. The external field cabling is terminated to theField Isolation Modules, mounted on the rear panel of the 19-inch rack.Figure 1-8. Field IsolationModule.1-8 Section 1. Description of FCU 2165/2175