Rockwell Automation 1755-OF8 GuardPLC Controller Systems - Manual (Page 77)

77 Publication 1753-UM001C-EN-P - March 2010 77
Chapter
7
Wire and Configure the 1753-IB8XOB8 Module
Introduction
The module features 8 digital inputs, 8 positive-switching digital
outputs, 2 negative-switching digital outputs, and 2 pulsed outputs.
Safety-related Digital
Inputs The status of the module’s 8 digital inputs is indicated via status
indicators when the controller or module is in Run mode.
LS+ is a voltage source that provides 24V DC for a group of four
inputs. There are two groups on the module. If devices require
24V DC to operate and use the same power source as the GuardPLC
module, wire the outputs of the device directly to inputs on the
GuardPLC module. Devices with their own dedicated power supply
can also be connected instead of contacts. Connect the reference pole
of the signal source to the L- reference pole of the input. See the
wiring diagrams in
Appendix C for examples.
Follow the closed-circuit principle for external wiring when
connecting sensors. To create a safety state in the event of a fault, the
input signals revert to the de-energized state (0). The external line is
not monitored, but a wire break is interpreted as a safe (0) signal.
Topic Page
Safety-related Digital Inputs 77
Safety-related Digital Outputs 78
Pulse Test Sources 81