Rockwell Automation 5094-IA16 - Thermal Shutoff

Rockwell Automation Publication 5094-UM001E-EN-P - April 2020 65
Output Module Features Chapter 4
Thermal Shutoff
Thermal Shutoff helps prevent damage to the output that can result when an
output gets hotter than it can handle.
This feature is directly related to Short-Circuit Protection feature. The
increased temperature at the output results from an excessive load at the output.
That is, a load with high current is applied to the output. The high current heats
the output beyond an acceptable temperature and the output turns off.
In the safety output modules (5094-OB16S, 509-OB16SXT), if overload or
short circuit to ground occurs, the point will turn off. This trigger by current
threshold is exceeded, regardless of temperature.
For standard modules, when conditions exist that cause Thermal Shutoff to turn
off the output, the following occurs:
• The output turns off.
• The I/O status indicator for the output becomes solid red.
• The I.Ptxx.ShortCircuit tag is set to 1.
For more information on how to use the modules, see Appendix
B,
Module Tag Definitions
on page 143.
For standard modules, when the conditions that caused a Thermal Shutoff no
longer exist, the following occurs:
• The output restarts in its commanded state.
• The I/O status indicator for the output turns off.
• The I.Ptxx.ShortCircuit tag is reset to 0.
For safety modules, refer to the Safety Output Fault Reset
procedure on page 83.
IMPORTANT These FLEX 5000 digital output modules are the only ones to support the
Thermal Shutoff feature:
• 5094-OB8, 5094-OB8XT
• 5094-OB16, 5094-OB16XT
• 5094-OB16S, 5094-OB16SXT
• 5094-OB32, 5094-OB32XT