CPU spec at a glance
The Siemens 6ES7288-1SR40-0AA1 is a SIMATIC S7-1200 CPU with 24 kbyte program memory, 144 bytes each for inputs and outputs (256 bits of digital plus 56 words of analog on each side). It supports LAD, FBD, and STL programming languages, plus a hardware clock with no battery backup — the RTC holds for 7 days without power.
With 24 kbyte of program memory and support for up to 8 PID loops, it handles a moderate machine cell — conveyors, packaging stations, or a small batch process — without needing a larger controller. The built-in RS-485 port (max 187.5 kbps) and PROFINET interface with autonegotiation let it talk to drives, HMIs, and remote I/O without an extra comm module. High-speed counters are parameterizable: four single-phase at 200 kHz and two at 30 kHz, or four A/B phase at 100 kHz and two at 20 kHz — enough for encoder feedback on a servo axis or flowmeter pulse input.