There are limits to the number of ProSoft modules that can be placed in your system's rack:
1. The number of available slots in the chassis.
2. The size of the power supply used for the chassis; specifically, how much 5vdc current is available. Each ProSoft module will require about 800mA of 5 vdc.
3. The amount of unused processor memory available for ladder logic and data tags/tables.
In addition ProSoft's SLC In-Chassis products only work in the local or local extrended SLC chassis since M0 and M1 files are used to transfer data across the backplane.