CPU 314 SFB — what the type code tells you
The 6ES7314-6CG03-0AB0: The SFB designation means this is a standard-function CPU, not a compact (no integrated I/O) and not a fail-safe (PROFIsafe is not supported). Function block memory is 8 KB, which sets the ceiling for user-program size in blocks — enough for moderate machine control but tight for large batch sequences.
Programming languages and toolchain
The CPU supports LAD, FBD, STL, SCL, CFC, and GRAPH — all six IEC languages, plus HiGraph for state-machine programming. Engineering requires STEP 7 V5.3 SP2 with the matching HW update — older versions won't see this CPU on the MPI/Profibus network.
I/O image and backplane limits
The process-image input and output areas are each 244 bytes — that's the I/O data the CPU refreshes each scan cycle, enough for a mid-size S7-300 rack with mixed digital and analog modules. Backplane short-circuit withstand is 0.7 A²·s — the I2t rating that the bus connector and backplane bus must survive during a fault on the rack.
No official successor or cross-reference to a different form factor — the S7-300 platform remains current for new installations and expansion of existing racks.