Communication Interface Module
Cat. No. 1784-KT2/C
Installation Data
29
This section shows you how to build the PLC–2 and PLC–3 loopback
connectors required for Off–Line Communications Diagnostics tests. Two
loopback tests are performed during an Off–Line Communications test. In
a loopback test, you download a program to the 1784–KT2 which:
transmits a packet of data
receives the same packet of data
verifies that the transmitted and received packets are identical
For more information on loopback tests, see the section entitled “The
Off–Line Communications Diagnostics Test.”
To build the PLC–2 and PLC–3 loopback connectors, you will need the
following items:
Table 6
Required Items for Building a Loopback Connector
Item:
Quantity:
AMP Part No.:
Connector housing
2
748367-1
Contact pins
16
748333-4
Handcrimp tool
1
90430-1
22-28 AWG wire
2 ft
(none)
Important: To ensure correct and reliable assembly, use the hand–crimp
tool with the AMP part number listed above.
Also, the maximum insulation diameter for each wire is 0.04”.
To build the PLC–2 and PLC–3 loopback connectors, follow the steps
below:
1.
Cut eight 3–inch sections of wire.
2.
Strip 0.2” of insulation off each end of wire.
3.
Using the crimp tool, crimp the contact pins onto each end of wire.
Building Loopback
Connectors