Overview
The Allen-Bradley 1771-SIM is a discrete input/output simulator module designed for the PLC-5 series automation platform. This simulation module can be installed in any Allen-Bradley PLC 5 series Bulletin 1771 universal I/O chassis. The module has 8 input simulation switches for replacing the manual input devices and 8 output indicators with a built-in LED for replacing the temporary output test lamps.
Key Features
- 8 Input Simulation Switches – Replace manual test devices for functional testing without external hardware
- 8 Output Indicators with LED – Monitor output state directly on the module without external instrumentation
- Single-Slot Module – Single-slot module with switches that simulate open/close devices
- Program Testing – The 1771-SIM input and output module can test programs for their response time to inputs and their response time for turning on and turning off.
- Low Backplane Current – Minimal power draw simplifies integration into existing chassis configurations
Technical Specifications
- Input Channels: 8 simulation switches
- Output Channels: 8 indicators with built-in LED
- Backplane Current: 300mA at 5V DC
- Operating Temperature: 32–140°F at 5–95% non-condensing ambient relative humidity, without de-rating
- Non-Operating Temperature: –40 to 185°F
- Dimensions: 2 in × 6 in × 10 in
- Weight: Approximately 1 lb
- Mounting: Keyed to the backplane through the connection between pins 14 and 16, 24 and 26 of the backplane top connector
Typical Applications
The 1771-SIM is commonly used in:
- PLC-5 program development and debugging without external test hardware
- Functional and regression testing of I/O logic before production deployment
- Training and troubleshooting in industrial control labs
- Maintenance and verification of discrete input/output circuits
- Rapid prototyping and proof-of-concept automation projects
Compatibility & Replacements
Compatible With
- Allen-Bradley PLC-5 Bulletin 1771 universal I/O chassis (all slot positions)
- PLC-5 series processors and controllers
- Legacy Allen-Bradley discrete I/O systems
- Industrial control systems requiring 8-point discrete simulation
Replaces / Drop-In Replacement For
The 1771-SIM is a legacy module that has been discontinued by Rockwell Automation as of December 31, 2019. For replacement solutions in modern systems, consult your system integrator regarding alternative simulation or testing modules compatible with current CompactLogix, ControlLogix, or PLC-5 upgrade platforms.
Works With
- PLC-5 ladder logic programming
- Allen-Bradley RSLogix 5 and RSLogix 5000 software (for legacy system support)
- Bulletin 1771 chassis backplane communication protocol
- DC-sourced and DC-sinking discrete I/O architectures
