Overview
The Allen-Bradley 1746-NO4I is a compact analog output module designed for the SLC 500 control platform. This four-channel analog output module uses a 16-bit 2’s complementary binary format and has 4 current outputs that provide an output range of 0 to +20 mA with full-scale current output of 21 mA. This module is used with SLC 500 fixed or modular style hardware. The unit features an embedded selector switch to allow selection of power supply source—internal power supply utilizes the supply from the backplane while external source refers to an external power supply with specification of 24 ±10% at 195 mA max.
Key Features
- Four analog outputs (0…20mA)
- 14-bit resolution via the R-2R Ladder conversion method with load range of 0 to 500 ohms and maximum load reactance of 100 µH
- Input step response of 2.5 milliseconds at 95%
- Uses shielded communication cable with removable terminal for simplified wiring and ease when replacing the module
- Flexible power sourcing with SW1 power selector switch
- LED status indicator present on module, compatible with 1746 chassis only
Technical Specifications
- Number of Outputs: 4 analog channels
- Output Type: Current (0–20 mA)
- Output Range: 0 to 20 mA, full-scale 21 mA
- Resolution: 14 bits
- Data Format: 16-bit 2’s complementary binary
- Backplane Current Draw: 55 mA at 5 VDC; 195 mA at 24 VDC
- External Power Supply: 24 Volts DC +/- 10% at 195 mA maximum
- Backplane Isolation: 500 Volts DC
- Step Response: 2.5 milliseconds at 95%
- Operating Temperature: 0 to 60 degrees Celsius
- Storage Temperature: -40 to 85 degrees Celsius
- Ambient Humidity: 5 to 95% non-condensing relative humidity
- Connection Style: Screw terminals (removable)
- Mounting: Direct insertion into 1746 SLC 500 chassis
- Weight: 0.44 lbs
Typical Applications
The 1746-NO4I is designed for the SLC 500 control platform and provides current-loop output signals for controlling industrial devices such as valves, drives, actuators, and instrumentation requiring 0–20 mA signals. This module is widely used in process control, machine automation, and applications requiring precise analog output regulation. Common uses include PID controller output assignment, proportional valve control, transmitter signal re-transmission, and data logging applications.
Compatibility & Replacements
Compatible With
- SLC 500 fixed-style controllers
- SLC 500 modular-style chassis (1746 backplane)
- Multi-chassis SLC 500 systems via communication adapters
- Studio 5000 (programming and configuration)
- Processes requiring 0–20 mA current-loop signals
Replaces / Drop-In Replacement For
- 1746-NO4I (standard revision)
- Verify part revision with your system integrator if upgrading from older SLC 500 analog output modules
Works With
- Allen-Bradley SLC 500 processors (all models)
- Studio 5000 Logix Designer software
- RSLinx Classic communication driver
- DH-485 and Ethernet communication networks (via appropriate bridge modules)
- Any standard 0–20 mA analog instrumentation (proportional valves, transmitters, drives)
