Get now the 2085-IA8, a high-quality 8-channel 120V AC digital input module designed for direct industrial AC signal monitoring.
What Is the 2085-IA8?
The 2085-IA8 is an expansion input module for the Allen-Bradley Micro850 and Micro870 PLC series, providing 8 points of 120V AC digital sensing. This module is specifically designed for systems where field devices operate on standard AC mains, such as limit switches on high-voltage machinery or feedback signals from AC motor starters. By allowing direct connection of 120V AC signals without the need for interposing relays or DC converters, the 2085-IA8 simplifies cabinet wiring and reduces the overall system complexity and cost.
Key Technical Specifications
- Inputs: 8 points (Type 1)
- Nominal Voltage: 120V AC
- Operating Voltage Range: 74V to 132V AC
- Off-State Voltage: 20V AC (max)
- On-State Current: 5.0mA @ 74V AC (min)
- Frequency Range: 47Hz to 63Hz
Functional Architecture and Safety
The 2085-IA8 utilizes advanced opto-isolation technology to protect the Micro800 processor from high-voltage AC spikes and electrical noise common in industrial environments. Each channel has an independent status LED on the front panel, which is invaluable for maintenance technicians for visual verification of input states. The module connects effortlessly to the 2085 bus and is fully supported within the standard Rockwell Automation software suite, ensuring high-speed data transfer between the field signals and the controller logic.
Installation Advice
Ensure that all 120V AC wiring is separated from low-voltage DC communication lines to prevent electromagnetic interference. Since this module handles AC mains voltage, always use the 2085-RTB removable terminal block to safely isolate the wiring before removing or replacing the module. We recommend the use of ferrules on all stranded wire connections to ensure a high-vibration resistant contact and to prevent short circuits between adjacent 120V terminals.
Frequently Asked Questions
Q: Can the 2085-IA8 handle 240V AC inputs?
A: No, the 2085-IA8 is rated strictly for 120V AC systems. For 240V AC, a different module or an interposing relay solution would be required.
Q: What is the input delay time for this module?
A: The 2085-IA8 typically has a hardware filter delay of 20ms for ON and 20ms for OFF states to ensure signal stability and filter out AC cycle fluctuations.
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