Many LabVIEW nodes such as VIs contain error in parameters you can use to manage errors. These parameters typically provide the same, standard functionality. When a node exhibits different parameter functionality, the exceptions are documented in the reference material for that node. Standard error in behavior is as follows:
Note Some nodes, such as error handling VIs, contain an error in parameter that does not provide standard error in functionality, but that contains an error in cluster that is standard.

Error in describes error conditions that occur before this node runs. The default is no error. If an error occurred before this node runs, the node passes the error in value to error out. This node runs normally only if no error occurred before this node runs. If an error occurs while this node runs, it runs normally and sets its own error status in error out. Use error in and error out to check errors and to specify execution order by wiring error out from one node to error in of the next node.

The error in cluster contains the following cluster elements:

Status is TRUE (X) if an error occurred before this node ran or FALSE (checkmark) to indicate a warning or that no error occurred before this node ran. The default is FALSE.

Code is the error or warning code. The default is 0. If status is TRUE, code is an error code. If status is FALSE, code is 0 or a warning code.

Source specifies the origin of the error or warning and is, in most cases, the name of the node that produced the error or warning. The default is an empty string.