Product Summary
The Allen-Bradley 1746-IA8 is an 8-channel digital AC input module for the SLC 500 system. It reliably monitors 100/120 Volt AC discrete signals. This module features North American Hazardous Location Approval for demanding industrial environments. It provides a robust interface between field devices and your controller.
Theme Option A: Product Procurement & Buyer Guide
Understanding the 1746-IA8 Voltage Specifications
This module operates within a voltage range of 85-132 Volts AC. You must verify your application's supply voltage matches this range. The nominal input current reaches 12 mA at 120V AC. This specification ensures reliable signal detection for standard industrial sensors.
Key Selection Criteria for Engineers
The 1746-IA8 offers eight input channels in a single slot. Its backplane current draw is only 50 milliamps at 5 Volts DC. This low power consumption minimizes strain on your SLC 500 power supply. The module weighs just 0.23 kg for easy handling.
Hazardous Location Compliance
This module carries the North American Hazardous Location Approval rating. This certification allows safe operation in specific hazardous environments. Procurement managers can use this module in Class I, Division 2 areas. This compliance reduces the need for expensive external isolation barriers.
Solving Installation Pain Points
The 1746-IA8 uses a simple chassis mounting method. It requires one slot in your SLC 500 rack. Use the 1746-HT or 1746-HCA wiring arms for field connections. The module has a status display for quick visual diagnostics.
Thermal Management for System Reliability
Each input point dissipates 0.27 Watts of heat. The module has a minimum dissipation of 0.25 Watts. Its maximum thermal dissipation reaches 2.4 Watts. This low heat output allows dense module placement without overheating.
Signal Delay Considerations
The signal ON delay has a maximum of 35 milliseconds. The signal OFF delay has a maximum of 45 milliseconds. The step response is 100 milliseconds in and 2.5 milliseconds out. Select this module for applications where these timing parameters are acceptable.
Theme Option D: Expert Technical Evaluation & Performance Review
Electrical Isolation and Noise Immunity
The 1746-IA8 provides 500V DC isolation at the communication circuit. It offers 1500V AC isolation at the backplane. This isolation protects your controller from electrical transients. It ensures stable operation in electrically noisy industrial environments.
Off-State Current and Voltage Analysis
The maximum off-state voltage is 30V AC. The maximum off-state current is 2 milliamps. These specifications prevent false triggering from leakage currents. The inrush current reaches a maximum of 0.8 Amps for 0.5 milliseconds.
Operating Frequency and Environmental Tolerances
The module operates at a frequency range of 47 to 63 Hz. This range accommodates global power standards. The operating temperature spans 32 to 140 degrees Fahrenheit. This tolerance suits most factory floor environments.
Signal Processing and Response Critique
The signal delays of 35 ms ON and 45 ms OFF are suitable for general-purpose inputs. These delays filter out electrical noise and contact bounce. They are not suitable for high-speed counting applications. The step response provides a total processing window of 102.5 milliseconds.
Backplane Current and Power Budgeting
The module draws 50 mA from the 5V DC backplane supply. It draws 0 mA from the 24V backplane supply. This consistent draw simplifies power budget calculations. Engineers can easily predict the total system power load.
Mechanical Design and Enclosure
The module has an open-style enclosure for heat dissipation. Its dimensions are 5 inches by 2 inches by 6 inches. This compact size fits standard SLC 500 racks. The design allows for easy access to wiring terminals.
Logistics & Standard Packaging Details
- One Allen-Bradley 1746-IA8 SLC 500 Digital AC Input Module
- Standard anti-static packaging for safe transit
- Product documentation and installation guide
- Express delivery shipping is available via FedEx, UPS, and DHL
