Pre-Installation Planning - Cable/Wiring Distance Planning
Revision 19 HC900 Process Controller Installation and User Guide 45
06/14
Cable/Wiring Distance Planning
For all installations observe the following guidelines.
• Maximum length of RS-232 cabling (Controller to PC) is 50 feet (15.2 meters).
• Maximum length of RS-485 cabling (Controller to Operator Interface) is 2000 feet (609.6 meters).
• For Ethernet connections, cable length must be less than 100m. For greater than 100m a switch is
required. The use of Ethernet cables in excess of 100 meters and/or devices other than recommended
Switches will cause transmission delays that could have adverse affects on Controller performance.
• You can also use fiber optic cable for connections between the controller and a remote rack. Distances
up to 750m (2460 ft.) can be accomplished with one fiber cable. Distances up to 1500m (4920 ft.) are
possible with a fiber switch used as a repeater at the midpoint. (See page 204)
• With redundant CPUs, when using 2 or more I/O racks an Ethernet switch is required between each CPU
and the I/O racks. Use Honeywell-approved switches only. (see page 204)
• Maximum of 2 switches between each CPU’s I/O port and all I/O racks.
• Cable lengths specified in this manual are absolute. When planning for routing of cables and wires, be
certain to include vertical and horizontal routing within cabinets, raceways, and conduits.
• It is advantageous to minimize length of I/O wiring. However, it is also a good idea to locate racks (and
wiring) away from adverse environmental conditions such as sources of RFI, EMI, and away from areas
with high levels of moisture, dust, and corrosive materials.
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