1794-IB8
8-Point DC Input Module · 24 VDC Sinking Digital Input Module
Lifecycle note: Use the unit nameplate and current official documentation as final references before approving a replacement.
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+86 153594082758-Point DC Input Module · 1794 Distributed I/O Platform
1794-IB8 is an eight-channel 24 VDC sinking input module for distributed field I/O. Each input reports the state of a connected DC field device through the rack adapter and controller data image.
The official instructions specify a 10 to 31.2 VDC on-state range, 8 mA nominal current at 24 VDC, 4.6 kΩ nominal impedance and 20 mA Flexbus current at 5 VDC.
Confirm the terminal base, common wiring, adapter compatibility, addressing, input filter, field-device leakage and module placement before installation. The channels are not individually isolated.
| Manufacturer | PLC |
|---|---|
| Model | 1794-IB8 |
| Product type | 24 VDC Sinking Digital Input Module |
| System family | 1794 Distributed I/O Platform |
| Catalog number | 1794-IB8 |
| Inputs | 8 current-sinking channels |
| On-state voltage | 10 VDC min / 24 VDC nominal / 31.2 VDC max |
| On-state current | 2.0 mA min / 8.0 mA nominal / 12.0 mA max |
| Off-state voltage | 5.0 VDC maximum |
| Off-state current | 1.5 mA maximum |
| Nominal input impedance | 4.6 kΩ |
| Flexbus current | 20 mA at 5 VDC |
| Power dissipation | 3.5 W maximum at 31.2 VDC |
| Thermal dissipation | 11.9 BTU/hr at 31.2 VDC |
| Isolation | 50 V continuous; 850 VDC type test for 60 s |
| Channel isolation | No isolation between individual channels |
1794-IB8 is an eight-channel 24 VDC sinking input module for distributed field I/O, reporting discrete device states through a compatible terminal base and adapter.
1794-IB8 accepts an on-state range of 10 to 31.2 VDC with 8 mA nominal current at 24 VDC, so field-device output characteristics must be checked.
The eight channels on 1794-IB8 are not individually isolated, so common wiring, grounding and separation requirements must be addressed in the field design.
1794-IB8 draws 20 mA from the 5 VDC Flexbus and dissipates up to 3.5 W at 31.2 VDC, requiring adapter and thermal budgets to remain adequate.
Before installing 1794-IB8, confirm the terminal base, adapter compatibility, keying, addressing, input filtering, common wiring and leakage characteristics of the connected devices.
For 1794-IB8, provide the exact catalog and series, quantity, adapter and terminal-base catalogs, field voltage, sensor type, wiring photographs and required delivery destination.
Send the complete 1794-IB8 catalog number, revision, quantity, destination and nameplate photo. Identification details will be checked before availability and lead time are confirmed.
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