Rockwell Automation Publication 5094-UM001E-EN-P - April 2020 63
Output Module Features Chapter 4
The standard output modules support the following minimum load currents:
• No load detection current, max = 0.5 mA
• On-state current per point, max = 1 mA
The I.Ptxx.NoLoad tag indicates the presence of a no load condition when it is
set to 1.
You can monitor a module tag in your program that corresponds to the No Load
Detection to check for a fault. For more information on the tag, see Appendix
B,
Module Tag Definitions
on page 143.
For safety output modules (5094-OB16S and 5094-OB16SXT), the guaranteed
load detection is 10 mA for both states, Off and On.
Recommended Loading Resistor - To limit the effects of leakage current through
solid-state outputs, you can connect a loading resistor in parallel with your load.
For 24V DC operation in standard modules, use a 5.6K ohms, 0.5 W resistor for
transistor operation. For 24V DC operation in safety modules, use a 2.4K ohms,
0.5 W resistor for transistor operation.
In the On state, the module must be connected to a load that draws a minimum
current equal to these values.
IMPORTANT These FLEX 5000 output modules are the only ones to support
No Load Detection:
• 5094-OB8, 5094-OB8XT
• 5094-OB16, 5094-OB16XT
• 5094-OB16S, 5094-OB16SXT
• 5094-OB32, 5094-OB32XT
IMPORTANT An output must remain in the off state a minimum of 250 ms for an open
load to be detected.
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