Rockwell Automation 1746-N3 SLC 500 32-Point I/O Module Connector Kit Installation Instructions - Manual

Publication 1746-IN025A-EN-P - June 2002
Installation Instructions
SLC 500™ 32-Point I/O Module Connector Kit
(Catalog Number 1746-N3)
Overview
The 1746-N3 Connector Kit is used to terminate a cable which connects field I/O
devices to SLC 500 32-point I/O modules. The kit contains a keyed 40-pin socket
header with 45 socket crimp type contacts.
The N3 connector is compatible with 32-point I/O modules, catalog numbers
1746-IB32, -IV32, -OB32, -OB32E -OV32 and Allen-Bradley 1492-IFM40 terminal
blocks (see illustration). When the 1746-N3 is used to terminate the I/O cable at the
1492-IFM40 end, it should be wired in a straight-through manner (i.e. pin 1 to pin 1,
pin 2 to pin 2, etc.). For additional instructions, refer to the wiring instructions
provided with your 32-point I/O module.
Use 24 AWG wire with the 1746-N3. Maximum wire length to the user terminal
block is 10 meters for inputs and 3 meters for outputs with 7-strand, 24 AWG wire.
(1) To maintain group isolation provided by 32-point I/O modules, use a 1492 terminal block that provides group isolation.
Consult 1492 documentation or your Allen-Bradley Sales Office for additional information.
(2) Maximum user cable length is dependent on how much voltage drop (current x (ohms/ft.) x (feet)) the user’s system can
tolerate. The user’s system should take into account the minimum turn-on voltage required by external loads connected to
the 32-point output modules and all of the voltage drops associated with wiring to and from the load, terminal blocks,
power sources and the module itself.
32-Point I/O Module
Male MIL-C-83503 Header
1746-N3 Connector
Keyed to prevent improper
insertion.
(one connector is provided with
each 32-point I/O module)
0.32 in. (8 mm) REF.
1492-IFM40xx DIN rail
mountable terminal block (1)
24 to 12 AWG
(0.2 to 4mm 2 )
User Assembled Cable