Rockwell Automation 1753-IB16XOB8 GuardPLC 16-Digital Inputs and 8-Digital Outputs Installation Instructions - Manual (Page 14)

14 GuardPLC 16-Digital Inputs and 8-Digital Outputs Module
Publication 1753-IN011A-EN-P - October 2005
Pulse Test Sources
The example shows 2 pulse test sources connected to the digital inputs (DI) of the
same system. As a result, the connections to the digital inputs (DI) are monitored
for line control.
When line control detects any of the following faults, inputs are set to 0, a fault
code is generated, and the FAULT LED indicator is on.
• short-circuit between two parallel connections
• reversal of two connections
• earth fault on one of the lines (only with earthed reference pole)
• line break or opening of the contacts (e.g., when one of the E-stop off
switches is pressed in the example above), the FAULT LED indicator is on
and the fault code is generated.
ATTENTION
Pulse test sources must not be used as safety-related outputs.
Emergency OFF 1 Emergency OFF 2
PO 1 2
DI 1 2 DI 3 4