| 6ES7321-1BH02-0AA0 | SIMATIC S7-300, Digital input SM 321, isolated, 16 DI, 24 V DC, 1x 20-pole |
| 6ES7321-1BH10-0AA0 | SIMATIC S7-300, Digital input SM 321, isolated, 16 DI, 24 V DC, 1x 20-pole, 0.05 ms input delay |
| 6ES7321-1BH50-0AA0 | SIMATIC S7-300, Digital input SM 321, Isolated 16 DI, 24 V DC, Source input, 1x 20-pole |
| 6ES7321-1BL00-0AA0 | SIMATIC S7-300, Digital input SM 321, Isolated 32 DI, 24 V DC, 1x 40-pole |
| 6ES7321-1BP00-0AA0 | SIMATIC S7-300 digital input SM 321, Isolated in groups of 16, 64 DI, 24 V DC, 3ms, Sink/source input Terminal blocks 6ES7392-1.N00-0AA0 and cable 6ES7392-4...0-0AA0 required |
| 6ES7321-1CH00-0AA0 | SIMATIC S7-300, Digital input SM 321, isolated, 16 DI, 24-48 V AC/DC with single rooting, 1x 40-pole |
| 6ES7321-1CH20-0AA0 | SIMATIC S7-300, Digital input SM 321, isolated, 16 DI, 48-125 V DC, 1x 20-pole |
| 6ES7321-1EL00-0AA0 | SIMATIC S7-300, Digital input SM 321, isolated, 32 DI, 120 V AC, 1x 40-pole |
| 6ES7321-1FF01-0AA0 | SIMATIC S7-300, Digital input SM 321, isolated, 8 DI, 120 V/230 V AC, 1x 20-pole |
| 6ES7321-1FF10-0AA0 | SIMATIC S7-300, Digital input SM 321, isolated, 8 DI, 120 V/230 V AC, 1x 40-pole, with single rooting/channel |
| 6ES7321-1FH00-0AA0 | SIMATIC S7-300, Digital input SM 321, Isolated 16 DI, 120/230 V AC, 1x 20-pole |
| 6ES7321-7BH01-0AB0 | SIMATIC S7-300, Digital input SM 321, isolated, 16 DI; 24 V DC, 1x 20-pole, process interrupt, diagnostics, suitable for isochronous mode |
| 6ES7321-7EH00-0AB0 | SIMATIC S7/PCS 7 SM 321 digital input, 16 DI; 24/125 V DC, 1 x 40-pole, interface with wire break diagnostics, hardware interrupt diagnostics |
| 6ES7321-7RD00-0AB0 | SIMATIC S7, digital input SM 321, isolated, 4 DI; 24 V DC, NAMUR/DIN 19234, for signals from the hazardous area, diagnostics-capable, PTB tested |
| 6ES7321-7TH00-0AB0 | SIMATIC S7/PCS7, digital input SM 321, 16 DI; 24 V DC, 1 x 40-pole, diagnostics-capable, for contacts (wired/ not wired), NAMUR encoder, 3/4-wire BERO, with chatter monitoring; Pulse extension, wire-break detection interface IM 153-2 required |
