Overview
The Allen-Bradley 1756-IF8 is a ControlLogix analog input module designed for 8 input points, accommodating both current and voltage signals. This used module features an open-style design without front door and supports flexible signal configuration. The 1756-IF8 integrates seamlessly into ControlLogix chassis-based and distributed I/O architectures, making it ideal for applications requiring multi-range analog signal acquisition.
Key Features
- 8 Configurable Input Channels – Support single-ended, differential, and high-speed differential wiring configurations
- Multi-Range Signal Support – Compatible with ±10VDC, 0–10VDC, 0–5VDC, and 0–20 mA input signals
- High-Resolution Conversion – 15-bit to 16-bit resolution depending on signal type; Sigma-Delta conversion method
- Wire-Off Detection & Diagnostics – Includes under/over-range detection, process alarms, and rate monitoring
- Flexible Installation – Mounts in local chassis or distributed I/O racks with removable terminal blocks (1756-TBCH, 1756-TBSH)
- Open-Style Enclosure – No door design for compact system integration
Technical Specifications
- Input Channels: 8 (configurable)
- Input Voltage Range: −10 to +10.25 V (configurable modes: ±10V, 0–10V, 0–5V)
- Input Current Range: 0–20 mA (0–20.5 mA max)
- Resolution: 15 bits (±10VDC), 16 bits (0–10V, 0–5V, 0–20 mA)
- Conversion Method: Sigma-Delta
- Power Consumption: 1.73 W
- Backplane Voltage/Current: 5.1 VDC @ 150 mA max; 24 VDC @ 40 mA max
- Scan Time: 16–488 ms (single-ended), 8–244 ms (4-point differential), 5–122 ms (2-point high-speed differential)
- Operating Temperature: 0 to 60°C
- Mounting: Chassis-mounted, single slot
- Connector Type: 36-pin, removable terminal block
- Overvoltage Protection: 30 VDC (voltage), 8 VDC (current)
- Certifications: CE, CSA, KC, MARINE, NRTL, RCM, UL
Typical Applications
The 1756-IF8 is widely used for:
- Transmitter and transducer signal conditioning
- Temperature and pressure monitoring systems
- Process control systems requiring multi-channel analog input
- Industrial measurement and data acquisition
- Panel meter and signal isolator interfaces
- Distributed I/O systems in large automation architectures
Compatibility & Replacements
Compatible With
- Allen-Bradley ControlLogix 5570 and 5580 Programmable Automation Controllers (PACs)
- ControlLogix CompactLogix extended racks
- 1756 series I/O chassis (local and distributed)
- Studio 5000 Logix Designer software
- EtherNet/IP, ControlNet, and DeviceNet networks
- Up to 4000 analog I/O points per ControlLogix system
Replaces / Drop-In Replacement For
- Used as direct replacement for OEM and surplus 1756-IF8 /A modules
- Verify compatibility with your system integrator before ordering
Works With
- Studio 5000 Logix Designer – Complete programming and configuration support
- EtherNet/IP – Industrial Ethernet integration
- ControlLogix Backplane – Plug-and-play 1756 series architecture
- Removable Terminal Blocks – 1756-TBCH and 1756-TBSH for tool-free wiring
