Specifications

Publication 1794-SG002D-EN-P - May 2012
82 Select FLEX Ex I/O Communication Adapters and Distribution Method
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.
1797-BCNR Coax 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. Thus, it
addresses intermediate size applications in a highly cost-effective manner. The
barrier can be mounted in safe, Division 2 or Zone 2 areas.
When using a 1797-BCNR, the total allowable length of a segment containing
standard RG-6 quad-shield cable depends on the number of taps in your segment.
There is no minimum trunk-cable section length requirement. The maximum
allowable length of a segment that contains a 1797-BCNR is 500 m (1640 ft)
with two taps connected. Each additional tap decreases the maximum length of
the segment according to the chart. The maximum number of taps allowed on a
segment is 20 with a maximum length of 250 m (820 ft).
FLEX I/O DeviceNet Adapter Specifications
Attribute 1797-RPFM
Communication interface Fiber optic cable
Fiber type 62.5/125 mm
Fiber termination type ST (plastic or ceramic)
Communication rate 5 Mbps
Noxious gas exposure Tested to severity level G3, ISA-S71.04-1985
Power dissipation Included in 1797-RPA
Dimensions (HxWxD),
approx
94 x 94 x 91 mm
(3.7 x 3.7 x 3.58 in.)
Weight, approx. 0.1 kg (0.22 lbs)
Thermal dissipation Included in 1797-RPA