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- 1794-IM8
- ControlNet Flex I/O Adapter Module
- USA
- 6.9 cm × 9.4 cm × 9.4 cm
- 0.06kg
- Xiamen, China
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Technical Overview – 1794-IM8 Digital Input Module (Flex I/O Series)
1. Product Introduction
The 1794-IM8 is a Flex I/O AC digital input module designed for industrial automation systems. It is used to receive high-voltage AC input signals from field devices such as switches, sensors, relays, and control contacts, and convert them into digital signals for PLC processing.
This module is designed for distributed I/O architecture, meaning it can be installed close to field equipment to reduce wiring complexity and improve system efficiency.
It supports 8 non-isolated AC input channels, typically operating at 240V AC nominal input voltage.
2. Product Parameters (Technical Specifications)
| Parameter | Specification |
|---|---|
| Input Type | AC Digital Input |
| Number of Inputs | 8 channels |
| Nominal Input Voltage | 240V AC |
| Input Voltage Range | approx. 220–240V AC |
| Input Current (nominal) | ~12 mA per channel |
| Off-state Voltage | ≤ 40V AC |
| Isolation Voltage | 250V continuous |
| Flexbus Current | ~30 mA @ 5V DC |
| Thermal Dissipation | ~16.2 BTU/hr |
| Operating Temperature | 0 to 55 °C |
| IP Rating | IP20 |
| Mounting Type | DIN rail (Flex I/O base required) |
| Wiring Type | Screw terminal base |
| Dimensions (L × W × H) | 6.9 cm × 9.4 cm × 9.4 cm |
| Weight | 0.06 kg |
| Material Form Factor | Compact modular plug-in unit |
| Power Supply | Backplane (Flexbus) powered |
3. Product Description
The 1794-IM8 module belongs to a modular I/O platform designed for scalable automation systems. It works as part of a Flex I/O station, which consists of:
- Terminal base unit
- Adapter module
- I/O module (1794-IM8)
Each input channel is designed to accept industrial AC voltage signals directly, eliminating the need for additional signal conditioning in many applications.
The module uses LED indicators to display input status for each channel, improving troubleshooting efficiency.
4. Applications
The 1794-IM8 is widely used in industrial and process automation environments such as:
- Manufacturing production lines
- Conveyor control systems
- Motor start/stop monitoring
- Machine safety interlocks
- Packaging systems
- Industrial HVAC control
- Utility monitoring systems
- Oil & gas control panels
- Water treatment plants
It is especially suitable where multiple high-voltage AC signals must be monitored remotely.
5. Product Advantages
5.1 Compact modular design
The plug-in structure reduces cabinet space requirements and simplifies system expansion.
5.2 Flexible distributed architecture
Supports remote I/O placement, reducing long cable runs and installation cost.
5.3 High-voltage AC input capability
Directly handles 240V AC field signals, eliminating external converters.
5.4 Easy maintenance
Hot-swappable design (system dependent) allows fast replacement with minimal downtime.
5.5 Clear diagnostics
Each channel includes LED status indicators for quick troubleshooting.
5.6 Industrial robustness
Designed for harsh environments with stable operation in standard industrial temperature ranges.
6. Brand & Series Information
- Brand: Industrial Automation Control Equipment Manufacturer
- Series: Flex I/O 1794 Series
- Product Category: Distributed I/O Module
- System Type: Modular PLC I/O platform
- Lifecycle Status: Legacy / end-of-life transition (replacement available in newer series)
7. Same Series – Recommended 5 Related Models
| Model | Type | Key Function | Channels | Input/Output Type | Weight (kg) | Dimensions (cm) |
|---|---|---|---|---|---|---|
| 1794-IA8 | AC Input Module | 120V AC input monitoring | 8 | AC digital input | 0.06 | 6.9 × 9.4 × 9.4 |
| 1794-IB8 | DC Input Module | 24V DC input signals | 8 | DC digital input | 0.06 | 6.9 × 9.4 × 9.4 |
| 1794-IE8 | Analog Input Module | Signal measurement | 8 | Analog input | 0.20 | 5.4 × 9.4 × 4.6 |
| 1794-OW8 | Relay Output Module | Switching control loads | 8 | Digital output | 0.07 | 6.9 × 9.4 × 9.4 |
| 1794-OE4 | Analog Output Module | Process control signals | 4 | Analog output | 0.10 | 6.9 × 9.4 × 9.4 |
8. Same Brand – 5 Popular Models
| Model | Category | Function | Channels | Voltage Type | Weight (kg) | Dimensions (cm) |
|---|---|---|---|---|---|---|
| 1756-IB16 | ControlLogix Input | High-density DC input | 16 | 24V DC | 0.30 | 14 × 13 × 5 |
| 1756-OB16E | Output Module | Digital output control | 16 | DC output | 0.32 | 14 × 13 × 5 |
| 1756-IF8 | Analog Input | Process monitoring | 8 | Analog | 0.28 | 14 × 13 × 5 |
| 1734-IB8 | POINT I/O Input | Compact DC input | 8 | 24V DC | 0.05 | 3.5 × 5.5 × 7 |
| 1734-OW4 | POINT I/O Output | Relay output control | 4 | Digital output | 0.05 | 3.5 × 5.5 × 7 |
9. Summary
The 1794-IM8 is a compact and reliable industrial AC input module designed for distributed automation systems. It is widely used for monitoring multiple AC field signals in industrial environments and integrates easily into modular PLC architectures.
Its strengths lie in simplicity, durability, and flexible system expansion, making it suitable for both small machine control systems and large-scale industrial automation setups.