Short Circuit Detection

Short circuit detection helps prevent damage that can result from driving a current from the channel greater than the maximum current level that the channel can handle.

Short Circuit Detection for Output Channels

Ports	Short Circuit Conditions with Detection	Description
0, 1, 2, 3	SSV Power Short Circuit	Short between terminals V+ and COM
	Odd Channel Output Short Circuit	Short between terminals I/Q and COM
	Even Channel Output Short Circuit	Short between terminals C/Q and COM

When a short circuit condition is detected, the following occurs:

The channel limits the output current and monitors for the short circuit condition to be removed.
The I/O status indicator for the channel flashes red.
The
I.IOLinkxx.Fault
or
I.Ptxx.Fault
tag is set to 1.

Check the channel diagnostic or retrieve the information from the diagnostic assembly to verify that the short circuit condition is present.

When the short circuit condition is removed, the following occurs:

The channel restarts in its commanded state.
The I/O status indicator for the channel turns back to steady yellow.
The
I.IOLinkxx.Fault
or
I.Ptxx.Fault
tag is reset to 0.

Check the channel diagnostic or retrieve the information from the diagnostic assembly to verify that the short circuit condition is removed.

To check the channel diagnostics, see Channels View.

For more information on how to retrieve diagnostic assemblies, see Diagnostic Assembly.

For more information on using module tags, see 5034-IOL4 and 5034-IOL4XT Details .