SIMATIC S7-300, digital input SM 321, isolated, 8 DI, 120 V/230 VAC, 1x 20-pole Type : 6ES7321-1FF01-0AA0 Brand : Siemens Condition : The actual condition is new, only used for commissioning spare parts and the box has been opened. Note: 1. Datasheet available upon request. 2. Contact the seller to confirm stock status.