Catalog > Semiconductors > IC - Voltage Regulators 6ES7421-1BL01-0AA0 6ES7421-1BL01-0AA0 SIMATIC S7-400, digital input SM 421, isolated 32 DI; 24 V DC Call for Price 0 in Stock Add Specifications, Prices & Availability may change without notice. Images are for illustration purposes only. E&OE