SIMATIC S7-300, Digital input SM 321, Isolated 32 DI, 24 V DC, 1x 40-pole Type : 6ES7321-1BL00-0AA0 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.