ModelSM321 Number of digital inputs:16  PNPProduct  Description16DI,24V DC; High immunity;stablePower consumption·From bus current consumption17mA·Power loss3.5WNumber of digital inputs16Cable Length (Shielded)1,000mCable Length (unshielded)600mInput voltage·Rate value24VDC·For "0" signal-30~5VDC·For "1" signal13-30VDC·Frequency range/Input current7mAInput delay·From "0"  to "1",Min1.2-4.8ms·From "1"  to "0",Min1.2-4.8msFront connector20-pinInput typePNPConnection of 2-wire BERO sensorYesPermissible quiescent current1.5mAIsolation tested for contact·Between channel and backplane busYes·Per group between channelsYesThe status indicatesGreen LED each channelDimensions(WxHx D)(mm)40×125×120Order Number6ES7321-1BH50-0AA0 We produce these substitute S7-200,300,Profibus Products.>>>>Can be produced with your brand and model number.<<<<