Cable/Wiring Distance Planning - Honeywell 900U02-0100 User And Installation Manual

4.9.

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 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 on the I/O link which could have
adverse affects on Controller performance.

You can also use fiber optic cable for connections between the controller and a remote rack.
Please refer to ControlEdge HC900 specification document (51-52-03-31) for more details.

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.
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.
How to make Ethernet cables
Ethernet cable (shielded Cat 5) contains 4 twisted pairs of wires and a drain wire. Each pair consists of a
solid color wire and a color wire with a white stripe.
Hold the cable ends and RJ45 connectors
1.
side by side as shown:
For straight through cable, arrange wires
2.
as shown in the following table. Wires go
"straight through", no crossovers.
Revision 10 ControlEdge HC900 Process & Safety Controller User and Installation Manual
May 2019
59