In-Cabinet Distributed I/O

Catalogs > Automation Systems Catalog > I/O > In-Cabinet Distributed I/O > 1797 FLEX Ex I/O

1797 FLEX Ex I/O

Communications Adapter

The diagnostic capabilities and determinism of the ControlNet network, along with its ability to be intrinsically safe, make it an ideal choice for distributing I/O into hazardous area applications. The redundant media ControlNet Ex communications adapter (1797-ACNR15) is high-speed and capable of communicating with as many as eight I/O modules for up to 128 I/O points.

The ControlNet Ex segment in the hazardous area must be protected from other ControlNet segments in safe areas. Isolation can be achieved via two approaches: by converting coax to fiber with a pair of fiber hubs/repeaters or by using a coax barrier.

An intrinsically safe network and I/O system installed in the hazardous area allows your data to be gathered at its origin and transported out of the area with the minimum amount of wiring. Cable penetrations into the hazardous area, cable trays, and conduit are all drastically reduced.

Cat. No.	Description		Communication Interface	Communication Rate	Power Dissipation (W)
1797-ACNR15	Dual Media ControlNet Ex 1.5 Adapter	The 1797-ACNR15 interfaces FLEX Ex I/O modules to a coax segment of a ControlNet Ex I/O link. It provides power to the backplane to run bus interface circuitry aboard I/O modules and is capable of dual ControlNet Ex cable media. I/O module capacity: 8	Quad-shield RG-6 coax (ControlNet Ex link)	5 Mbps	8.5 W
1797-RPA	ControlNet Ex Coax Drop Repeater Module	The 1797-RPA functions as part of the fiber repeater hub within the hazardous area to extend the length of the ControlNet Ex segments to interlink systems all operating within the area. Fiber media port adapter capacity: 2	Quad-shield RG-6 coax (ControlNet Ex link)	5 Mbps	8.5 W
1797-RPFM	ControlNet Ex 3 km Fiber Media Port Adapter	The 1797-RPFM (part of the fiber repeater hub) functions as a non-intelligent fiber to backplane conversion device and converts glass fiber infrared LED media signals to backplane signals for use by the 1797-RPA repeater module.	62.5/125-micron fiber (ControlNet Ex link)	5 Mbps	Included in 1797-RPA
1797-BCNR	Redundant ControlNet Barrier Module	The redundant media ControlNet coax barrier (1797-BCNR) isolates the ControlNet segment in the safe area from that in the hazardous area. It allows connection into the hazardous area without converting to/from fiber media. The barrier can support up to 20 adapters and distances up to 500 meters.			—
1797-BIC	Bus Isolator Module	The bus isolator modules, 1797-BIC and -CEC, allow you to configure FLEX Ex modules and FLEX I/O modules on the DIN rail when attached to the same adapter and grouped together on appropriate sides of the bus isolator module. This highly flexible, cost-effective solution combines intrinsically safe and non-intrinsically safe systems. I/O module capacity: 8⋆			2.1 W
1797-CEC	Flexbus Connector Module				—
⋆ 8 FLEX Ex modules. Note that a total of eight I/O modules can be attached to a 1794 FLEX I/O adapter. The 1797-BIC and 1797-CEC are not included in this number. In intermixed systems, the number of 1797 FLEX Ex I/O modules (attached onto the 1797-BIC) plus the number of 1794 FLEX I/O modules (connected between the adapter and the 1797-CEC) cannot exceed eight.

Certifications

Cat. No.	Certifications⋆
1797-ACNR15	CENELEC: Class I Division 1 Groups A...D T4 UL, C-UL: Class I Division 1 Groups A...D T4 Class I Zone 1 AEx ib IIC T4 Class II Division 1 Groups E, F, G; Class III‡  FM: Class I Division 1 Groups A...D T4 Class I Zone 1 AEx ib IIC T4 INMETRO: BR-Ex ib IIB/IIC T4
1797-RPA	CENELEC: II (1) 2G EEx ia/ib IIB/IIC T4 UL, C-UL: Class I Division 1 Groups A...D T4 Class I Zone 1 AEx ib IIC T4 Class II Division 1 Groups E, F, G(1); Class III‡  FM: Class I Division 1 Groups A...D T4 Class I Zone 1 AEx ib IIC T4 INMETRO: BR-Ex ib IIB/IIC T4
1797-RPFM	CENELEC: II (1) 2G EEx ia/ib IIB/IIC T4 UL, C-UL: Class I Division 1 Groups A...D T4 Class I Zone 1 AEx ib [ia] IIC T4 Class II Division 1 Groups E, F, G(1); Class III‡  FM: Class I Division 1 Groups A...D T4 Class I Zone 1 AEx ib IIC T4 INMETRO: BR-Ex ib IIB/IIC T4
1797-BIC	CENELEC: II (2) G [EEx ib] IIC II (2D) FM: Nonincendive, use for Class I, Division 2 Groups A...D or Class I, Zone 2 Group IIC Provides intrinsically safe outputs to Class I, Division 1 Groups A...D or Class I, Zone 1 Group IIC INMETRO: BR-Ex ib IIB/IIC T4
1797-CEC	FM: Nonincendure, use for Class I, Division 2 Groups A…D or Class I, Zone 2 Group IIC
1797-BCNR	CENELEC: II (2) G [EEx ib] IIC UL, C-UL: Class I Division 1 Groups A...D T4 Class II Division 1 Groups E, F, G; Class III
⋆ See the Product Certification link at http://www.ab.com for declarations of Conformity, Certificates, and other certification details. For additional certification information, see the FLEX Ex System Certification manual, publication 1797-6.5.6.