For PLC TSX3722101, Can the software be installed in the internal memory of the device or its only on the memory card ?
The Program can be loaded in PLC internal ram and its battery backed up.
If program size is within the limit of PLC RAM then no issues. if size exceeds , then additional memory card may be required and program is shared between both internal and memory card.
Note :- This internal RAM is volatile , means when battery is drained out program will be lost.
There is additional card available called memory backup card. This card stores program.
Even if the battery is dead, when PLC is powered, program transfer will occur from backup card to RAM and PLC will go to run. This is just for additional information only.