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The Siemens 6ES7321-1BH01-0AA0 is a simatic S7-300. 6ES73211BH010AA0 is a digital input SM 321, optically isolated, 16 DI, 24 V DC, and 20 PIN. Successor number: 6ES7321-1BH02-0AA0.
The Siemens 6ES7321-1BH02-0AA0 is a simatic S7-300. 6ES73211BH020AA0 is a digital input SM 321, optically isolated, 16DI, 24 V DC, 1 X 20 PIN. 
The Siemens 6ES7321-1BL00-0AA0 is a simatic S7-300. 6ES73211BL000AA0 is a digital input SM 321, optically isolated, 32DI, 24 V DC, 1 X 40 PIN.
The Siemens 6ES7321-1CH00-0AA0 is a Simatic S7-300. 6ES73211CH000AA0 is a digital input SM 321, optically isolated, 16DI, AC/DC 24-48V with one channel per common, 1 x 40 PIN. 
The Siemens 6ES7321-1CH20-0AA0 is a Simatic S7-300. 6ES73211CH200AA0 is a digital input SM 321, optically isolated, 16DI, DC 48-125V, 1 X 20 PIN. 
The Siemens 6ES7321-1EL00-0AA0 is a Simatic S7-300. 6ES73211EL000AA0 is a digital input SM321, optically isolated, 32DI, 120 V AC, 1 X 40 PIN. 
The Siemens 6ES7321-1FF01-0AA0 is a Simatic S7-300. 6ES73211FF010AA0 is a digital input SM 321, optically isolated, 8 DI, 120V/230V AC, 1 X 20 PIN. 
Input Module, 120/230 VAC, 16 pts