SIMATIC S7-300, Digital input SM 321, isolated, 16 DI, 24 V DC, 1x 20-pole6ES7321-1BH02-0AA0 : SM321, 16DI, DC24VSKU: 6ES73211BH020AA0Programming support? (optional)500QuantityAdd to WishlistProduct ConditionBrand NewReturn & Refund Policyas per PA terms & conditionsShipping Infocost extra at the time of delivery