Connecting To Remote I/O - CTI Janus 2500C-J Series Installation And Operation Manual

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.
Terminating
Resisto
TB
Drop Line
C
P
U
Cable Selection
The following cables (or equivalent) are acceptable for use for remote I/O connections.
Belden Outside
Cable Diameter
Type
9182 0.35 in.
8.9 mm
9271 0.24 in
6.1 mm
9860 0.44 in.
11.2.mm
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
44
r
TB
Remote
Base
Impedance Capacitance
150 ohms 28.9 pf/m
124 ohms 40 pf/m
124 ohms 35.8 pf/m
Section 2.9
Line
TB
Drop Line
Remote
Base
Velocity
0.78c
0.66c
0.78c
for the port pinout.
CTI Janus Programmable Automation Controller IOG
Terminating
r
Resisto
TB
Remote
Base
TB = Terminal Block
Center
Conductor
22 AWG 19x34
46 ohm/km
25 AWG 7x33
104.3 ohm/km
16 AWG Solid
13.8.ohm/km