# Adding an Additional Substation ES CICS Interface

You can add an additional Substation ES CICS Interface connection to a CICS region.

The current version of Substation ES supports about thirty interfaces per single started task.

## Procedure

1. Add the Substation ES CICS resource definitions to the CICS region if this has not yet been done.
   - Repeat the step of the CICS Installation that updates the CSD.
   - Assign the correct CSD file to your JCL definition.
2. Create a new Substation ES CICS interface member by copying the default CICS SIP member located in `USERHLQ.INTF(SXCINTF)` to a new name.
   This new member must have a different `INTF-ID` keyword value. If connecting to a different CICS region, the `APPLID` keyword value must be changed.
3. Edit the Substation ES SIP member.
   The default member is `USERHLQ.INTF(SXSSIP$1)`.
4. Add a new `INTF-MEMBER` keyword, specifying the newly created CICS member as the keyword value.
   For example: `INTF-MEMBER`=NEWINTF
5. Go to the Substation ES configuration panels, Option 4, and add the interface to the existing list.
   Note:
   - Ensure that the interface Id is the same as specified in the interface member.
   - Never use identical CICS `INTF-IDs` within a single region of Substation ES.

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