Siemens 6ES7921-3AF20-0AA0The Siemens 6ES7921 3AF20 0AA0 programmable logic controller (PLC) from the S7 200 series is engineered for diverse industrial automation needs, such as manufacturing, process control, and building automation. This robust controller is powered by a Siemens S7 200 processor operating at 24 MHz, with 4 KB of RAM and 128 KB of flash memory to store essential programs and data. It supports multiple communication protocols like Profibus and Modbus,
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