The Siemens S7-300 6ES7-321-1BH02-0AA0 DIGITAL INPUT SM 321 16DI. The simatic s7-300 digital input sm321 galvanically isolated 16 di / dc 24v 1 x 20 pin process interrupt diagnostics fit for isochrone mode.
Details of Siemens S7-300 6ES7-321-1BH02-0AA0 provided by its distributors:
Siemens 6ES7 321-1BH02-0AA0 is now available incipient surplus. Siemens S7-300 6ES7 321 1BH02 0AA0 DIGITAL INPUT SM 321 16DI. Distributed I/O Digital Module DC Input MODULE INPUT S7300 16DI 24VDC 20PIN.

The Siemens 6ES73211BH020AA0 SIMATIC Digital Input Module.The Model 6ES73211BH020AA0 MODULE INPUT S7300 16DI 24VDC 20PIN. SIMATIC S7-300 DIGITAL INPUT SM 321