Overview
The Allen-Bradley 1771-ID16 is an isolated 120V AC/DC input module designed for PLC-5 processors in industrial automation and control systems. This 16-channel digital input module provides galvanic isolation between input circuits and the PLC backplane, ensuring safe operation in multi-phase and electrically noisy environments. The 1771-ID16 features customer-selectable input filtering to suppress voltage transients from contact bounce and radiated electrical noise, improving signal integrity and reducing downtime.
Key Features
- 16 isolated digital input channels for independent signal processing
- Operates at 77–138V AC (50/60 Hz) and 105–138V DC
- Customer-selectable input filter time jumpers (JPR 1 & JPR 2) with fixed 1 ms off-to-on transition
- Factory-set 9 ms filter delay for signal noise suppression
- Galvanic isolation between phases for multi-phase applications
- Compatible with 1771-WN 40-terminal wiring arm for tool-free field wiring
- Works with 1771-A1B or 1771-A4B or later I/O chassis
- Screw-terminal connections for secure wiring
Technical Specifications
- Input Channels: 16 isolated
- Input Voltage Range (AC): 77–138V AC (50/60 Hz)
- Input Voltage Range (DC): 105–138V DC
- Nominal Voltage: 120V AC/DC
- Amperage per Input: 6 mA
- Input Current: Capacitive impedance (initial transient current present)
- Filter Time: Customer-selectable; factory default 9 ms (on-to-off), 1 ms (off-to-on)
- Response Time: 0–18 milliseconds
- Backplane Current Draw: 0.075 Amps @ 5VDC
- Operating Temperature: up to 140°F (60°C)
- Connections: Screw terminals via 1771-WN wiring arm
- Certifications: CE, CSA, UL, C-TICK, MARINE
- Weight: 2.27 lbs
- Part Number: 1771-ID16 /A Rev A
Typical Applications
- Safety-function monitoring in industrial control systems
- Multi-phase isolated input acquisition for process automation
- Float switch, limit switch, and pushbutton signal monitoring
- Electrical isolation for selector switch and pilot device inputs
- Retrofit and legacy PLC-5 system upgrades
Compatibility & Replacements
Compatible With
- PLC-5 processors (all models)
- 1771-A1B and 1771-A4B or later I/O chassis
- 1771-WN 40-terminal field wiring arm
- 1771-OD16 AC output module (direct drive without external resistor)
- RS Logix 5 programming software
Replaces / Drop-In Replacement For
- 1771-ID16 /A (all revisions)
- 1771-ID16 /B (different revision)
- Legacy 16-point isolated AC/DC input modules requiring 120V operation
Works With
- Allen-Bradley PLC-5 automation systems
- Rockwell Automation legacy control platforms
- EtherNet/IP and DH+ communication gateways (via PLC-5 integration)
- Isolated multi-phase control and safety applications
