Spare-part CPU for S7-200 CN lines
The Siemens 6ES7214-2AS23-0XB8 is the S7-200 CN variant of the CPU 224XP SI — a compact device with a DC power supply, 14 digital inputs, 10 transistor sinking outputs, 2 analog inputs, and 1 analog output. This order code is explicitly marked as a spare part for existing S7-200 CN installations, with CE approval only. Program memory is 12/16 KB, data memory is 10 KB, and the CPU carries two PPI/user-programmable interfaces for communication. The 14 digital inputs and 10 transistor sinking outputs give it the I/O count to handle a medium-sized machine section without an expansion module.
The CPU measures 140 mm wide, 80 mm high, and 62 mm deep — it occupies a standard S7-200 footprint and clips onto a DIN rail. Typical power loss is 8 W, so the enclosure needs enough free-air volume or a ventilation slot to keep the internal ambient below the rated limit.