The Control/Status word is going to depend on the PLC. I forgot to get the model number from you. Do you know what it is or have a link to the documentation?
The Live List provides the active status of the slaves associated with an on-board network interface acting as master. It is only an option in a gateway with a master/slave configuration though, so this will not be relevant in your case as the AB7838 is essentially a slave/slave device.