The 6ES72141KF400XB0: This is the Siemens SIMATIC S7-1200 CPU 1214 BC — a compact safety PLC that bundles standard and fail-safe I/O in a single, non-expandable package. It carries 4 digital inputs and 4 relay outputs for standard control, plus 16 fail-safe digital inputs and 4 fail-safe digital outputs for safety functions like emergency stops and light curtains. The 125KB memory handles the application logic and safety program together, but the non-expandable form factor means you size it for the final I/O count upfront — no adding modules later.
The 1214 BC is a fail-safe CPU, meaning the onboard safety I/O can run PROFIsafe over the backplane without a separate safety module. The 4 fail-safe outputs are relay type, so they switch loads up to the relay rating directly — no external interposing relays needed for the safety path. Because the CPU is non-expandable, the 16 fail-safe inputs and 4 fail-safe outputs are the entire safety budget. If your safety matrix needs more than 4 outputs, this CPU won't stretch — you'd step up to an expandable fail-safe CPU or add a remote safety I/O station.
For a line-down spare or a new build, this CPU is sourced to order against your BOM.