# Adding Substation ES Instances to a Single CICS Region

You can configure multiple Substation ES instances that communicate to a single CICS region.

To share one ESB configuration file with multiple instances of Substation ES, distinguish between recipes or triggers definitions for the Substation ES instances with groups. For details, see Defining Groups.

The current version of Substation ES supports up to five Substation ES instances connected to a single CICS region.

For each Substation ES instance, perform the following steps:

## Procedure

1. Create a copy of the Substation ES SIP for CICS interface member `USERHLQ.INTF(SXCINTF)`. In the new member specify a new INTF-ID keyword value.
2. Create a copy of Substation ES SIP ESB interface member `USERHLQ.INTF`(`SXSIEMS1` or `SXSIRV1`).
   Make parameter changes that are necessary.
3. Create a copy of the Substation ES SIP for the TCP interface member `USERHLQ.INTF(SXSITCP)`. In the new member, specify a new INTF-ID and URL.
4. Optional: Create a copy of the Substation ES SIP for the Admin interface member `USERHLQ.INTF(SXSIADM)`. In the new member, specify the corresponding ESB `INTF-ID` from Step 2 to the new `ESB-INTF-ID` keyword value.
   This step is required only if Substation ES Heartbeat communications is used.
5. Create a new copy of the Substation ES system initialization parameters SIP member `USERHLQ.INTF(SXSSIP$1)`.
6. Change the `INTF-MEMBER` entries in the Substation ES SIP member for each of the newly created CICS, ESB, TCP and Admin Interface member names.
7. Change the Substation ID in the Substation ES SIP.
   Note: Each active Substation ES must have a unique Substation ID.

   The number of HVT workers for Reliable and Guaranteed must be the same in all Substation ES definitions going to the same CICS.

8. Create a new copy of the Substation ES system startup parameters (SSP) member `USERHLQ.INTF(SXSSSP$1)`.
9. Change the `SIPMEM` keyword value and point it to the newly created `SXSSIP$1` member.
10. In the Substation ES startup JCL or Procedure, change the `PARM` card value to point to the newly created Substation ES SSP member, for example: `'-SSPMEM NEWSSP$1'`

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