Description
What Makes the 1746-IA16 Essential for SLC 500 Systems?
How do you reliably capture 85-132 VAC field signals without overloading a controller chassis? The Allen-Bradley 1746-IA16 answers that challenge as a 16-channel digital AC input module built for the SLC 500 platform. It occupies a single slot and converts real-world AC signals into logic the processor can scan.
Input modules represent the primary scan phase of any PLC program. Without detected input signals, the controller has no reference for executing logic. The 1746-IA16 delivers that reference precisely, supporting both fixed and modular hardware styles, locally or in an expansion rack.
1746-IA16 Key Features and Technical Specifications
- Voltage Range: 85-132 Volts AC input signal
- Inputs: 16 channels, 16 points per common
- Backplane Current: 85 milliamps at 5 Volts DC
- Signal Delay, ON: 35 milliseconds maximum
- Signal Delay, OFF: 45 milliseconds maximum
- Off-State Current: 2 milliamps
- Off-State Voltage, Max: 50V AC
- Slots: One slot of the SLC 500 chassis
- I/O Connection: 1746-HT and 1746-HCA
- Step Response: 100 milliseconds in, 2.5 milliseconds out
The module weighs 0.34 kg with dimensions of 13 cm x 5 cm x 15 cm. It carries 0.27 watts per point, up to 0.425 Watts, totaling 4.8 Watts. The 20-terminal block is removable, so you can replace the module without reconnecting input terminations.
Compatibility and Integration Notes
The 1746-IA16 belongs to the SLC 500 AC input family with a 100-120VAC operating category. For 200/240VAC operation, the counterpart part number is 1746-IM16. Neither module offers internal protection circuitry, so any AC input device must be compatible with the SLC 500 input circuit inrush current.
Because this is a chassis-mounted module, integration depends on available slots. It installs in fixed or modular hardware, locally or in an expansion rack. When wiring into fieldbus networks, an external gateway or connection module may be required; confirm cables and gateways with the supplier.
Applications and Use Cases
General-purpose input applications suit this module well. For instance, it captures pushbutton, limit switch, and proximity sensor states across a production line. Consequently, the controller receives accurate ON/OFF data for each scan cycle. Additionally, the 85-132 VAC range matches common 120VAC control circuits. Therefore, it integrates into existing AC control panels without voltage conversion.
Maintenance and Reliability
Inspect the module periodically for loose terminal connections and environmental contamination. Because the removable terminal block simplifies replacement, downtime stays minimal. Furthermore, the 35 ms ON and 45 ms OFF delays filter brief signal noise. As a result, the 1746-IA16 supports stable long-term operation in industrial environments.
FAQ: 1746-IA16 Technical Questions
Q: What voltage range does the 1746-IA16 accept?
A: It accepts 85-132 Volts AC input signals with a 100-120VAC operating category.
Q: How many channels does this module provide?
A: It provides 16 input channels with 16 points per common.
Q: What is the backplane current draw?
A: The module draws 85 milliamps at 5 Volts DC from the backplane.
Q: Which I/O connectors are used?
A: The 1746-HT and 1746-HCA connection types are specified for this module.
Q: Is there a 200/240VAC version?
A: Yes, the counterpart part number for 200/240VAC operation is 1746-IM16.
Ask PLC Pioneer Limited’s PLC specialists for compatibility and availability.
