Rockwell Automation 1786-RG6F INSTL.INSTR CONTROLNET H-FLEX - Manual (Page 6)

6 ControlNet Standard and High-flex Coax Cable
Publication 1786-IN009B-EN-P - November 2003
EXAMPLE
Example 3: Determining the maximum allowable length of
standard cable when mixing standard RG-6 and high-flex RG-6F
cable in the same system
In this example, the segment:
• has 7 nodes (requires 7 taps)
• requires 656.2 ft (200 m) high-flex 1786-RG6F cable
1. Calculate the amount of standard 1786-RG6 cable that is equivalent
to 656.2 ft (200 m) of 1786-RG6F cable by multiplying the ratio
between the two attenuations by the length of RG-6F cable.
(13.5 db / 5.99 db) * 656.2 ft (200 m)= equivalent length of standard
RG-6
Equivalent length of standard 1786-RG6 = 1478.9 ft (450.8 m)
2. Calculate the remaining allowable maximum length of standard
1786-RG6 cable.
3280 ft (1000m) - 1478.9 ft (450.8 m) = 1801.1 ft (549.2 m)
3. Calculate the remaining allowable length on a segment with 7 taps.
1801.1 ft - (53.4 ft * [7 - 2]) = 1534.1 ft (467.6 m)
20162-M
1534.1 ft (467.6 m) 656.2 ft (200 m)
terminator terminator
1786-RG6 cable
tap tap tap
1786-RG6F cable