| Model no | SM 1221 DI 8x24 V DC | |
| Article No | H7 221-1BF32-0XB0 | |
| Description | Digital value input module DI8 x 24VDC | |
| Conventional norm | Dimensions WxHxD（mm） | 45x100x75mm |
| Power dissipatio | 1.5W | |
| Available current（SM bus 5V） | 105mA | |
| Available current（Sensor power 24V） | Input 4mA per point used |
| Digital input | Input points | 8 |
| Input type | Drain type/source type | |
| Rated voltage | 4mA 24VDC，Rating value | |
| Maximum continuousallowable voltage | 30VDC | |
| Surge voltage (Maximum) | 35DVC，sustained 0.5s | |
| Logic 1 signal (Minimum) | 2.5mA 15V DC | |
| Logic 0 signal (Maximum) | 1mA 5V DC | |
| Photoelectric isolation (Field side andLogic side) | 500 V AC，sustained 1 min | |
| Isolation group | 2 | |
| Filtering time | 0.2、0.4、0.8、1.6、3.2、6.4 and 12.8 ms(Optional, 4 in a group) |
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