Originla 6ES7 521 1BH00 0AB0 S7 1500 Siemens PLC Módulo SM521 DI16 Entrada Digital 16 DI 24V 6ES7521 1BH00 0AB0
https://www.vogueparade.com/shopping/PT/200327231/1/1005003463156127/originla-6es7-521-1bh00-0ab0-s7-1500-siemens-plc-modulo-sm521-di16-entrada-digital-16-di-24v-6es7521-1bh00-0ab0//