Performance Parameters
| Features | 8DI，24VDC | 16DI，24VDC | 32DI，24VDC | |
| Order No. | CTH2 221-1BF32 | CTH2 221-1BH32 | CTH2 221-1BL32 | |
| Physical Features | ||||
| Dimension（W×H×D） | 46 × 96 × 62mm | 71.3 × 96 × 62mm | 138 × 96 × 62mm | |
| Power loss | ||||
| Power loss | 2W | 3W | 3W | |
| +5VDC Current consumption | 57mA | 79mA | 179mA | |
| Input Features | ||||
| Input | 8DI | 16DI | 32DI | |
| Input type | Sink/ Source | |||
| Voltage input | ||||
| Rated voltage | 24VDC | |||
| Voltage input | 30VDC | |||
| Surge voltage | 35VDC，0.5s | |||
| Logical 1 Signal | 15～30V | |||
| Logical 0 Signal | 0～5V | |||
| Isolation | ||||
| Optical isolation | 500VAC，last 1 minute | |||
| Isolated points per group | 4 | 4 | 8 | |
| Input delay | 4.5ms | |||
| Max.leak current | 1mA AC | |||
| Maximum cable length | ||||
| Unshielded | 300m | |||
| Shielded | 500m | |||
| Simultaneous input | ||||
| 40℃ | 8 | 16 | 32 | |
| 50℃ | 8 | 16 | 32 | |
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