Rockwell Automation Publication 1791ES-UM001G-EN-P - November 2016 13
Safety Function Operation Chapter 1
Safety Inputs
Read this section for information about safety inputs and their associated test
outputs. A safety input can be used with test outputs. Safety inputs are used to
monitor safety input devices.
Using a Test Output with a Safety Input
A test output can be used in combination with a safety input for short circuit
detection. Configure the test output as a pulse test source and associate it to a
specific safety input.
The test output can also be used as a power supply to source 24V DC for an
external input circuit.
Figure 2 - Example Use of a 1791ES-IB16 Module
ATTENTION: You can configure Test Outputs to be used as standard outputs.
You can connect actuators to Test Output points that are expecting a Standard
configuration.
Test Output points configured as Pulse Test or Power Supply become active
whenever you apply input power to the module. These configured functions are
independent of the I/O connections to the module.
ATTENTION: If a module with Test Outputs configured as Pulse Test or Power
Supply is incorrectly installed in an application where actuators are
connected to these Test Output points, the actuators are activated when
input power is applied.
To prevent this possibility, follow these procedures.
• When installing or replacing a module, be sure that the module is correctly
configured for the application or in the out-of-box condition before applying
input power.
• Reset modules to their out-of-box condition when removing them from an
application.
• Be sure that all modules in replacement stock are in their out-of-box
condition.
I8 I9 T8 T9 I10 I11 T10 T11M I12 I13 T12 T13 I14 I15 T14 T15M
I0 I1 T0 T1 I2 I3 T2 T3M I4 I5 T4 T5 I6 I7 T6 T7M
IN+ IN-
24V DC
24V DC Output with Test Pulse
External Contact
Safety Input
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