# Substation ES Interface States

The following table describes the codes for the Substation ES interface states that are displayed in various messages.

Code | Description
--- | ---
`0` | Inactive.
`1` | Active.
`2` | Disconnected from its target for an ESB, CICS, or IMS Interface.
`9` | Not found. This is most likely an incorrect parameter definition supplied by you.

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