Rockwell-automation 1797-BCNR FLEX Ex Redundant ControlNet Barrier Mod User Manual download pdf (Page 10)

10 FLEX Ex Redundant ControlNet Barrier Module

Publication

1797-5.35 - July 2004

2. Connect the redundant ControlNet Ex trunk cable to connector C

after removing the insulator boot.

3. Connect the ControlNet trunk cable to terminal A.

4. Connect the redundant ControlNet trunk cable to terminal D.

5. Install a direct ground wire with a minimum diameter of 4mm

between terminal E and the PA Ground (Equipotential System) in the

hazardous area where the ControlNet Ex coax cable is installed.

Do not connect terminal E or the DIN rail to a standard earth ground

connection in the safe area.

When using a 1797-BCNR, the total allowable length of a segment containing

standard RG-6 quad shield cable depends upon the number of nodes in your

segment. There is no minimum trunk-cable section length requirement. The

maximum allowable length of a segment which contains a 1797-BCNR is

500m. (1640 ft.) with two nodes connected (one node on each side of the

1797-BCNR).

Each additional node decreases the maximum length of the segment

according to the plot below. The maximum number of non-redundant media

nodes allowed on a segment is 21 with a maximum length of 250m (820 ft.).

Please note that the maximum number of redundant media nodes on a

segment is 11 with a maximum length of 250m (820ft.).

IMPORTANT

Only remove the 1797-BCNR covers if the ControlNet Ex tap

drop cable is installed.

250

500

21 non-redundant

nodes or 11

redundant nodes

Number of Nodes with One 1797-BCNR

Segment Length (m)

1 2 ... 5 6 7 8 9 10 11 12 13 14 15 ... 23 24

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Rockwell-automation 1797-BCNR FLEX Ex Redundant ControlNet Barrier Mod User Manual Page 10