https://www.ibm.com/docs/en/ims/15.1.0?topic=databases-building-application-control-blocks-acbgen
IMS 15 - Database administration - Building the application control blocks (ACBGEN)
You can create application control blocks (ACBs) for each DBD and each PSB that is used in your system by running either the ACB Maintenance utility or the ACB...
building the applicationdatabase administrationcontrol blocksims