If you are running multiple JFM task on the same system, do you need to define multiple CA7LOG events (DCM's) to ENF?
No, you can only have 1 CA7LOG event defined per lpar.
The CAIDAM DD in the ENF started task must to the CA 7 CAL2LOAD and the ENFPARMS must have the DCM/EVENT definition. Sample below:
DCM(CAL2DCM3) * CA 7 JFM JOB LOG EVENT
For more information on defining DCM's see the Workload Automation CA 7 Interfaces Guide.