Allen-Bradley 1794-IM8 Flex I/O 220V AC Digital Input Module
Product Overview
The 1794-IM8 is a Flex I/O digital input module from Allen-Bradley. It provides 8 non-isolated inputs for 220V AC signals. This module is part of the Rockwell Automation Flex I/O system. It operates with a nominal on-state voltage of 240V AC. The 1794-IM8 features selectable input filter times. It offers robust performance for industrial digital sensing applications.
Key Technical Specifications
| Brand | Allen-Bradley / Rockwell Automation |
| Model | 1794-IM8 |
| Series | Flex I/O |
| Inputs | 8 non-isolated (1 group) |
| On-State Voltage (min) | 159V AC |
| On-State Current (max) | 13.21 mA @ 264V AC |
| Off-State Current (max) | 2.6 mA |
| Nominal Input Impedance | 22.3 kΩ |
| Filter Times (Off→On / On→Off) | Selectable: 7.5/26.5 ms (default) to 42/60.5 ms |
| FlexBus Current | 30 mA @ 5V DC |
| Power Dissipation (max) | 4.7W @ 264V AC |
| Thermal Dissipation | 16.2 BTU/hr @ 264V AC |
| Isolation | Tested at 2600V DC for 1s (user to system) |
| Indicators | 8 yellow status LEDs |
| Keyswitch Position | 8 |
| Mounting | DIN rail or panel mount |
| Operating Temp. | 0 to 55 °C (32 to 131 °F) |
| Storage Temp. | -40 to 85 °C (-40 to 185 °F) |
| Vibration | 5g @ 10-500 Hz |
| Shock (Operating) | 30g peak |
| Wire Size | 12 gauge (4mm²) stranded max. |
Installation & Compatibility
Mount the 1794-IM8 on a DIN rail or directly onto a panel. Use the 1794-TBN terminal base unit. The module requires a FlexBus connection for communication. It supports 8 input channels with a common return. Ensure proper fuse installation to protect the module.
Input Filter Configuration
You can select filter times via the output image table. Default settings: Off-to-On = 7.5 ms, On-to-Off = 26.5 ms. Other options provide delays from 8/27 ms up to 42/60.5 ms. This flexibility helps reduce noise and prevent false triggers.
Diagnostics & Maintenance
The module features 8 yellow status indicators for field-side signal monitoring. These LEDs help with quick troubleshooting. The module offers easy access for wiring checks. Its design simplifies integration into existing Flex I/O systems.
Typical Applications
Ideal for PLC and DCS systems requiring AC digital input sensing. Common in packaging, material handling, and conveyor systems. Also suitable for motor control centers and panel building. The 1794-IM8 works seamlessly with Modicon Quantum systems via appropriate adapters.
Certifications & Environmental
- Class I Division 2 certified (Groups A, B, C, D)
- Class I Zone 2 Group IIC certified
- UL, CSA, and CE compliant
- Open enclosure rating
- RoHS compliant
Why Buy From Oiltech Controls?
- 15+ years of industrial automation expertise
- Global shipping via FedEx, UPS, DHL
- Tested surplus and refurbished options available
- 12-month warranty on all products
- Technical verification prior to shipment
- Support for obsolete control systems
Frequently Asked Questions (FAQ)
- Q: What terminal base does the 1794-IM8 require?
A: It requires the 1794-TBN terminal base unit. - Q: Can I change the input filter time?
A: Yes, select from 8 filter settings via the output image table. - Q: What is the maximum on-state current?
A: Maximum on-state current is 13.21 mA at 264V AC. - Q: Is the module isolated?
A: Channels are non-isolated, but user-to-system isolation is tested at 2600V DC. - Q: What is the operating temperature range?
A: 0 to 55 °C (32 to 131 °F).
Packaging & Warranty
Each 1794-IM8 module ships in protective packaging. The package includes the module and necessary mounting hardware. We provide a 12-month warranty against manufacturing defects. For inquiries, contact info@oiltechcontrols.com or +86 158 8020 0923 (WhatsApp).
Shipping: We deliver worldwide via FedEx, UPS, and DHL. Tracking details are provided after dispatch.
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