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CTI Janus Programmable Automation Controller IOG
7.1.3
Connecting to Remote I/O
Remote I/O is connected to the CTI Janus controller via RS-485 cable. Cabling is typically connected in a trunk line/
drop line arrangement as shown below.
Cable Selection
The following cables (or equivalent) are acceptable for use for remote I/O connections.
Belden
Cable
Type
Outside
Diameter
Impedance
Capacitance
Velocity
Center
Conductor
9182
0.35 in.
8.9 mm
150 ohms
28.9 pf/m
0.78c
22 AWG 19x34
46 ohm/km
9271
0.24 in
6.1 mm
124 ohms
40 pf/m
0.66c
25 AWG 7x33
104.3 ohm/km
9860
0.44 in.
11.2.mm
124 ohms
35.8 pf/m
0.78c
16 AWG Solid
13.8.ohm/km
Belden 9182 is suitable for intermediate length trunk lines. This cable cannot be intermixed with other cables for
trunk lines. In addition, if this cable is used for a trunk line, it must also be used for all drop lines. It may also be
used for drop lines with Belden 9860 or Belden 9271 trunk lines.
Belden 9271, which is smaller and more flexible, is suitable for use as drop lines as well as short trunk lines. For
trunk lines, this cable may be intermixed with Belden 9860.
Belden 9860 cable, which provides low attenuation and distortion, should be used for long trunk lines.
When wiring the cable connectors, see
Remote
Base
Remote
Base
Remote
Base
TB
TB
TB
TB = Terminal Block
Drop Line
C
P
U
TB
Drop Line
Line
Terminating
Resisto
r
Terminating
Resisto
r
