Supply Original Siemens 6ES7521-1FH00-0AA0 SM521 16DI 120VAC Digital Input Expansion Module For S7-1500 PLC
We supply original sealed Siemens SM521 6ES7521-1FH00-0AA0 digital input module for SIMATIC S7-1500 PLC system. Core Spec:16 channels AC input(120~264VAC,47~63Hz),divided into 4 channels per group,standard input delay 20ms,screw terminal front connector(front connector sold separately). Built-in optoelectronic isolation(1500V AC isolation between field and backplane bus),support channel fault diagnosis for open circuit & short circuit,LED fault indication,IP20 protection,35mm DIN rail backplane installation. Perfect for collecting AC field switch signals in power plant,water treatment and heavy industry equipment.12-month factory warranty,sufficient inventory for bulk order & global shipment.