Allen-Bradley 1769-IA16 CompactLogix AC Digital Input Module
The Allen-Bradley 1769-IA16, also cataloged as the 1769-IA16 AC Digital Input Module, operates as a dedicated hardware component for 120 VAC discrete signal detection within CompactLogix control platforms.
Hardware Specifications
| Parameter | Specification |
|---|---|
| Model | 1769-IA16 |
| Brand | Allen-Bradley |
| Origin | United States |
| Weight | 0.34 kg (0.75 lbs) |
| Dimensions | 118 x 35 x 87 mm (H x W x D) |
| Operating Temp | 0 to +60 deg C |
| Power Consumption | 115 mA Backplane Current at 5.1 VDC (3.3 W Max Dissipation) |
| Number of Inputs | 16 Inputs (1 Group, Internally Connected Commons) |
| Operating Voltage Range | 79 to 132 VAC |
| Operating Frequency | 47 to 63 Hz |
| Input Current | 10 to 12 mA at 120 VAC |
| Input Delay Time | ON Delay: 20 ms / OFF Delay: 20 ms |
| Maximum Inrush Current | 250 mA |
| Off-State Voltage / Current | Max 20 VAC / Max 2.5 mA |
| Input Impedance | 12 kohms at 50 Hz, 10 kohms at 60 Hz |
| Power Supply Distance Rating | 8 Modules |
Backplane Bus Communication Velocity & Determinism
The Allen-Bradley 1769-IA16 processes incoming 120 VAC discrete signals through internal opto-isolators, converting field AC states into digital logic flags within a fixed 20 ms filter delay. The module consumes 115 mA at 5.1 VDC backplane current, transferring 16-point input status arrays directly to CompactLogix and MicroLogix 1500 processors across the local 1769 bus. Deterministic network execution and backplane bus communication velocity remain consistent across scaled expansion banks up to the maximum power supply distance rating of 8 modules, maintaining seamless firmware flash compatibility.
Frequently Asked Questions
Q: How do the internally connected commons affect field wiring for the 16 input channels?
A: All 16 AC input channels share a common internal connection return, requiring all field input devices connected to the module to operate off the same AC voltage phase supply.
Q: What is the maximum distance the 1769-IA16 module can be installed relative to the system power supply?
A: The module carries a power supply distance rating of 8, meaning it must be installed within 8 module slots of a system power supply, such as a 1769-PA2, 1769-PB2, 1769-PA4, or 1769-PB4, to ensure proper backplane power distribution.
Field Installation Guidelines
Isolate system backplane power and external AC field circuits before installing or servicing the input module. Mount the module onto a standard 35 mm DIN rail or panel surface, ensuring the backplane connector locks firmly into the adjacent slot or power supply housing. Connect field wiring to the screw terminals using 22 to 14 AWG solid or 22 to 16 AWG stranded copper wire rated for at least 90 deg C. Route high-voltage AC input conductors separate from low-voltage DC lines and communication buses to minimize electromagnetic noise coupling.
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