Proxy Original Siemens 6ES7521-7EH00-0AB0 SM521 Digital Input Expansion Module 16DI NAMUR For S7-1500 PLC
We act as proxy distributor for original Siemens 6ES7521-7EH00-0AB0(SM521) NAMUR digital input module for S7‑1500 PLC. 16‑channel NAMUR intrinsically safe digital input, matches standard NAMUR proximity switch, applicable for explosion hazardous area field signal collection, spring-type push-in front connector for fast wiring. Support channel diagnostics for wire break, short circuit, optical isolation between backplane and field side, IP20, backplane mounting on S7‑1500 DIN rail. Original factory packaging, 12-month warranty, long-term proxy supply for bulk order and global delivery.