Allen-Bradley 5069-OBV8S - Page 136

136 Rockwell Automation Publication 5069-UM004A-EN-P - April 2019
Chapter 5 Safety Module Features
Figure 12 - 5069-IB8S or 5069-IB8SK Test Pulse in a Cycle
On the 5069-IB8S or 5069-IB8SK module, the test pulse width (X) is less than
700 μs; the test pulse period (Y) is less than 100 ms.
When the external input contact is closed, a test pulse is output from the test
output terminal to diagnose the field wiring and input circuitry. By using this
function, short-circuits between inputs and 24V power, and between input
signal lines can be detected.
Figure 13 - Short Circuit Between Input Signal Lines
OUT
X
Y
On
Off
24V DC
TO0
IN 0
IN +
COM
IN 1
TO1
24V DC
0V DC
External Contact
External Contact
Short circuit between input signal
lines and power supply (positive side)
Short circuit between channels 0
and 1.