| Basic order number | Name | Manufacturer |
|---|---|---|
| 6ES7321-1CH20-0AA0 | S7-300 Digital Input Module SM 321; DI 16 × 48 - 125 V DC | Siemens |
| 6DU1161-1S___-____ | CS3000 single unit; plattform for: MODBUS / IEC60870 / DNP / CS275 / P3000 | Siemens |
| 6ES7321-1FH00-0AA0 | S7-300 Digital Input Module SM 321; DI 16 x 120/230 V AC | Siemens |