New Original Siemens 6ES7521-1BH50-0AA0 SM521 DI16×24VDC Sourcing Digital Input Expansion Module For S7-1500 PLC
We supply brand new original sealed Siemens 6ES7521-1BH50-0AA0 (SM521 Basic BA) digital input module matching SIMATIC S7-1500 PLC system. Core Spec:16-channel DC24V sourcing input(Type3 IEC61131),single group 16 points,typical input delay 3.2ms,working voltage range DC19.2~28.8V. With optoelectronic isolation between backplane bus and field side; support channel fault diagnosis for open circuit,LED status indication; IP20 protection, DIN rail backplane mounting, front connector(screw/push-in type) purchased separately. Perfect for standard DC proximity switch,relay feedback signal acquisition for machinery,water treatment and general factory automation.12-month manufacturer warranty,global bulk order delivery available.