Proxy Original Siemens 6ES7521-1BL10-0AA0 SM521 32DI 24VDC Sinking Digital Input Expansion Module For S7-1500 PLC
We are authorized proxy distributor for original Siemens 6ES7521-1BL10-0AA0 SM521 digital input module for SIMATIC S7-1500 PLC system. 32-channel 24VDC sinking digital input following IEC Type3 standard, typical input delay 3.2ms, software filter range 0.1~20ms adjustable. Equipped with optoelectronic isolation between backplane bus and field wiring, supports single-channel diagnosis for open circuit and short-circuit failure. Front connector sold separately (screw or push-in optional), IP20 protection, directly plugged onto S7-1500 backplane DIN rail. Widely used for large-scale conveyor, packaging, machinery automation projects. Original factory sealed package with 12-month warranty, long-term bulk proxy supply and worldwide shipping service available.