Safety Modules Owner manual

Rockwell Automation Publication 1791ES-UM001D-EN-P - May 2013 19
Understand the Operation of Safety Functions Chapter 2
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 4 - Example Use of a 1791ES-IB16 Module
Table 1 - Typical Pulse Width and Period
Figure 5 - Test Pulse in a Cycle
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
Attribute 1791ES-IB8XOBV4 1791ES-IB16
Pulse width 500 μs 500 μs
Period 150 ms 150 ms
44295
OUT
On
Off
Typ ic al
500 μs
Typ ic al
150 ms