| Spec | Description |
|---|---|
| S1 | Next digital input subscriber block |
| S2 | FIP variable identifier |
| S3 | Group number |
| S4 | Input type |
| S5 | Asynchronous promptitude period (millisecond) |
| S6 | Synchronous promptitude period (millisecond) |
| S7 | Aperiodic/periodic variable |
| S8 | Asynchronous/synchronous refresh evaluation |
| S9 | Spare |
| S10 | Spare |
| S11 | Spare |
| Block | Type | Description |
|---|---|---|
| N | Bit | Digital input 1 |
| N+1 | Bit | Digital input 2 |
| N+2 | Bit | Digital input 3 |
| N+3 | Bit | Digital input 4 |
| N+4 | Bit | Digital input 5 |
| N+5 | Bit | Digital input 6 |
| N+6 | Bit | Digital input 7 |
| N+7 | Bit | Digital input 8 |
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