Rockwell Automation 1746-XXXX SLC 500 32-Channel Digital I/O Modules Installation Instructions - Manual (Page 8)

8 SLC 500™ 32-Channel Digital I/O Modules
Publication 1746-IN028A-EN-P - October 2003
Electronically Protected Module (1746-OB32E)
Electronic Protection
The electronic protection of the 1746-OB32E has been designed to provide
protection for the module from short-circuit and overload current conditions. The
protection is based on a thermal cut-out principle. In the event of a short circuit or
overload current condition on an output channel, that channel will limit current
within milliseconds after its thermal cut-out temperature has been reached. All
other channels continue to operate as directed by the CPU (processor) module.
ATTENTION
!
A transient pulse occurs in transistor inputs when the external
dc supply voltage is applied to the output common terminals
(e.g., via the master control relay). This can occur whether or
not the processor is powered. For most applications, the
energy of this pulse is not sufficient to energize the load. For
more information on transient pulses and guidelines to reduce
inadvertent processor operation, refer to the SLC 500 Modular
or Fixed Hardware Style Installation and Operation Manual
(Publication Number 1747-6.2 or 1747-6.21).
IMPORTANT
The module does not provide protection against reverse
polarity wiring or wiring to AC power sources. Electronic
protection is not intended to replace fuses, circuit breakers, or
other code-required wiring protection devices.
OUTPUT
EFUSE
EFUSE LED
Front View