Rockwell Automation 1746-XXXX SLC 500 32-Channel Digital I/O Modules Installation Instructions - Manual (Page 12)

12 SLC 500™ 32-Channel Digital I/O Modules
Publication 1746-IN028A-EN-P - October 2003
Option 2 - Using Allen-Bradley 1492 Wiring Systems
Allen-Bradley 1492 wiring systems are available for connecting 32 point I/O
modules to external I/O. These wiring systems include a pre-wired cable available
in four lengths: 0.5m (1.6 feet), 1.0m (3.3 feet), 2.5m (8.2 feet), 5.0m (16.4 feet). An
Interface Module for connecting external devices is also available. Cables are
equipped with keyed connectors at both ends for proper connections. Interface
modules are DIN rail mountable and are available with or without field side status
indicating LEDs. Stick-on labels are provided with the Interface modules to identify
I/O wiring termination points.
(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. See the table on page 13 for voltage drop values for the 1492 cables shown above.
32-Point I/O Module
Male MIL-C-83503 Header
1492-CABLExx
(2)
Connects 32-point module
to DIN rail mountable
terminal block
0.32 in. (8 mm) REF.
1492-IFM40xx DIN rail mountable terminal block
(1)
24 to 12 AWG
(0.2 to 4mm
2
)