The Allen-Bradley 1756-IA16I is a high-reliability ControlLogix digital input module designed for 120V AC industrial signal acquisition with individual channel isolation.
Unlike standard AC input modules, the “I” version provides electrically isolated inputs for each point, significantly improving noise immunity, fault containment, and system safety in complex industrial environments. This makes it particularly valuable in high-density control panels where electrical interference, grounding differences, and long cable runs are common.
As part of the Allen-Bradley ControlLogix ecosystem, the 1756-IA16I is widely used in mission-critical automation systems requiring robust signal integrity and dependable operation under harsh electrical conditions.
Technical Specifications
| Category | Specification |
|---|---|
| Product Type | 120V AC Isolated Digital Input Module |
| Series | ControlLogix 1756 |
| Input Channels | 16 individually isolated inputs |
| Input Voltage Range | 74–132V AC |
| Nominal Voltage | 120V AC (50/60 Hz) |
| Input Type | AC digital, isolated per channel |
| On-State Current | ~5–15 mA depending on voltage |
| Off-State Current | ≤ 2.5 mA |
| Input Delay | ~8–18 ms (configurable filter dependent) |
| Isolation Voltage | 125V continuous (channel-to-channel isolation) |
| Backplane Power | ~0.71 W |
| Power Dissipation | Up to 4.9 W @ 60°C |
| Operating Temperature | 0°C to 60°C |
| Dimensions (H × W × D) | 13.3 × 14.5 × 5.1 cm |
| Weight | ~0.22–0.56 kg (depending on revision/source) |
Recommended Related Models
- 1756-IA16 Standard 120V AC Input Module (non-isolated version)
- 1756-IB16 24V DC Digital Input Module (low-voltage field devices)
- 1756-OB16 Digital Output Module (actuator control expansion)
- 1756-IF8 Analog Input Module (process signal acquisition)
- 1756-EN2T Ethernet Communication Module (system networking upgrade)
Popular Allen Bradley Models
- 1756-IA16I Isolated AC Input Module
- 1756-IB16 DC Input Module
- 1756-OB16 Digital Output Module
- 1756-L83E ControlLogix CPU Module
- 1756-EN2TR Redundant Ethernet Module
