Overview
The Allen-Bradley 1756-IF8H /A is a ControlLogix 8-point HART analog input module designed for simultaneous analog signal processing and digital communication with HART-enabled field instruments. This module features eight differential voltage or current input channels and one Highway Addressable Remote Transducer (HART) modem. It allows simultaneous analog signal processing and digital communication with HART-enabled field instruments, providing both process data and device diagnostics.
Key Features
- Configurable for 0-20 mA and 4-20 mA input signals, and voltage inputs of ±10 VDC, 0-5 VDC, 1-5 VDC, and 0-10 VDC
- 16–21-bit resolution for precision analog-to-digital conversion
- Compatible with HART 5, 6, and 7 standards
- Three data formats via Studio 5000 Logix Designer: analog only, analog and HART PV, and analog and HART by channel
- On-board data alarming and real-time channel sampling
- 36-position spring clamp removable terminal block (1756-TBCH or 1756-TBS6H compatible)
Technical Specifications
- Input Channels: 8 differential channels
- Input Signal Types: Current (0-20 mA, 4-20 mA) and voltage (±10 VDC, 0-5 VDC, 1-5 VDC, 0-10 VDC)
- Resolution: 16-21 bits
- Backplane Current: 300 mA @ 5.1 VDC and 135 mA @ 24 VDC
- Backplane Power: 4.77 Watts total
- HART Capability: One HART modem per module, compatible with HART 5, 6, and 7
- Operating Temperature: 0 to 60 degrees Celsius
- Certifications: CE, CUL, KC, MARINE, RCM, UL
- Weight: 0.79 lb
- Terminal Connection: Tension clamp spring
Typical Applications
- Process control systems requiring HART device communication
- Multi-channel analog signal acquisition in manufacturing and batch operations
- Smart transmitter monitoring and diagnostics in industrial plants
- Advanced control loops with integrated device parameter access
- Instrumentation systems combining legacy analog with modern smart devices
Compatibility & Replacements
Compatible With
- Allen-Bradley Logix controller platform
- Studio 5000 Logix Designer programming software
- ControlLogix systems
- 1756-TBCH or 1756-TBS6H removable terminal blocks
- HART 5, 6, and 7 protocols and devices
- EtherNet/IP networks with ControlLogix
Replaces / Drop-In Replacement For
The 1756-IF8IH is an isolated variant with similar channel count and HART capability, though the 1756-IF8H (non-isolated) is the standard differential input module. Verify with your system integrator before substituting any modules to ensure isolation and signal integrity requirements are met.
Works With
- Studio 5000 Logix Designer
- EtherNet/IP
- ControlLogix data alarming and sampling functions
- HART field instruments and transmitters
- Allen-Bradley ControlLogix I/O networks
