- Programmable Logic Controller (PLC), SIEMENS PLC Systems
Siemens Simatic S5 CP 521 communications Processor 6ES55218MA21
- 6ES55218MA21 Siemens SIMATIC S5, CP 521 SI COMMUNICATIONS PROCESSOR (SERIAL INTERFACE) FOR S5-90U/95U/-100U, ET 200U 6ES5521-8MA21
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