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Description
Application Scenarios
Consider a high-speed case-sealer on a packaging line where photocell-triggered guard-door interlocks, product-presence sensors, and jam-detect switches must evaluate a safety-and-sequence condition in under 1 ms to prevent mechanical damage. Rather than burdening the CompactLogix CPU with this repetitive scan-dependent logic, the integrator inserts a 1769-BOOLEAN into the local 1769 rack. The module’s eight DC inputs wire directly to the field sensors, and its configurable Boolean expression (e.g., Output = IN0 AND (IN1 OR IN2) AND NOT IN3) evaluates locally. When TRUE, the corresponding sourcing output drives the enable circuit for the conveyor drive—completely independent of the controller scan time. This eliminates scan-delay-induced nuisance trips, simplifies the main PLC program, and gives maintenance staff visible per-channel LED diagnostics right on the module front. The 1769-BOOLEAN directly solves the pain point of needing deterministic, ultra-fast discrete logic evaluation in a standard Compact I/O form factor without adding a separate dedicated logic solver.
Parameter
| Main Parameters | Value / Description |
|---|---|
| Product Model | 1769-BOOLEAN |
| Manufacturer | Allen-Bradley (Rockwell Automation) |
| Product Category | Compact I/O Boolean Control Module (Combination 24V DC DI + DO with Logic Processor) |
| Digital Inputs | 8 × 24V DC Sinking, 10–30V DC operating range, 2.0 kΩ input impedance @ 24V DC |
| Input Delay (Programmable) | 0–15 ms selectable input filter; default OFF→ON / ON→OFF ~10 µs hardware response |
| Digital Outputs | 4 × 24V DC Sourcing Transistor, 0.5 A max per point @ 20.4–26.4V DC, individually fused |
| Boolean Operations | Configurable per output: AND, OR, XOR (exclusive-OR), or NONE (direct program control) |
| Closed-Loop Time | ≤ 1 µs (input sensed → Boolean evaluated → output responds, module-internal) |
| Backplane Current Draw | 220 mA max @ 5.1V DC; 0 mA @ 24V DC (power derived from rack backplane) |
| Isolation Voltage | 1200V AC for 1 s or 1697V DC for 1 s; 75V DC working voltage (IEC 61131-2 Class 2 reinforced insulation) |
| Heat Dissipation (Max) | 3.55 W |
| Operating Temp / Humidity | 0 °C to +60 °C (32–140 °F); 5–95% RH non-condensing |
| Dimensions (H×W×D) | 118 × 35 × 87 mm (4.65″ × 1.38″ × 3.43″); occupies 1 slot in 1769 chassis |
| Mounting Method | 35 mm DIN Rail (EN 50022) or panel mount via 1769 end-plate hardware |
| Certifications | UL listed, cULus, CE marked, C-Tick, UKCA, ABS (Marine) |
Technical Principles and Innovative Values
- Innovation Point 1 – Autonomous Boolean Logic Evaluation: Unlike standard 1769 digital I/O modules, the 1769-BOOLEAN contains a dedicated logic processor that can evaluate Boolean expressions (AND / OR / XOR / NONE) locally using any combination of its eight physical inputs as operands. Outputs change state in ≤1 µs based on the evaluated expression—independent of the PLC scan—making it ideal for hard-wired interlocks, safety gates, and high-speed reject stations.
- Innovation Point 2 – Dual Operating Modes (Direct vs. Boolean Control): Each of the four outputs on the 1769-BOOLEAN can be independently configured for Direct Control (driven by the CompactLogix / MicroLogix 1500 program via the backplane, like a normal output module) or Boolean Control (driven by the module’s own expression engine). This flexibility lets users mix conventional programmed outputs with autonomous logic-driven outputs in a single module.
- Innovation Point 3 – Programmable Output Delay & Duration: The 1769-BOOLEAN supports configurable TRUE-to-output delay (0–65,535 ms) and output pulse duration (0 = latched, or timed pulse). This enables debounce of mechanical contacts, one-shot reject pulses synchronized to encoder positions, or timed alarm strobes—all handled in hardware without ladder logic timers consuming CPU overhead.
- Innovation Point 4 – Integrated Diagnostics & Per-Channel LEDs: Each input and output channel on the 1769-BOOLEAN has a dedicated green LED for real-time status verification at the panel. Module OK, Run, and Force LEDs provide quick health checks. Combined with input interrupt capability and Program-to-Fault configuration options in Studio 5000 / RSLogix 5000, the module significantly accelerates field troubleshooting and reduces mean time to repair (MTTR).
Application Cases and Industry Value
Case 1 – Automotive Body Shop Welding Cell Interlock Panel:An automotive Tier-1 supplier retrofitted a weld-cell safety interlock panel that previously used cascaded hard-wired relays to combine guard-door, light-curtain, and dual-hand-control signals. The retrofit installed a 1769-BOOLEAN in the existing 1769 rack beside a 1769-L35E CompactLogix CPU. Eight safety-related 24V DC PNP sensors fed the module’s inputs; the Boolean expression (Guard_OK AND LightCurtain_OK AND (LH_PB AND RH_PB)) was configured on Output 0 in Boolean Control mode. The result was deterministic, scan-independent interlock evaluation with visible LED confirmation at the rack, elimination of relay contact wear issues, and a 25% reduction in panel wiring complexity. The main PLC simply monitors the module’s output image word for cell-ready status.Case 2 – Bottling Line Reject Gate Timing Optimization:A beverage bottler needed a reject gate to fire only when both a bottle-presence sensor and a downstream reject-request flag were true, but with a precisely timed 150 ms pulse to match conveyor speed. Previously this was done with multiple timer instructions in the main task, occasionally missing fast runs during peak scan loading. By deploying the 1769-BOOLEAN, the two inputs were evaluated locally with a 150 ms duration setting on the Boolean-controlled output. The reject fired consistently at line speeds up to 600 bpm, and the freed PLC timer resources allowed the main control program to be simplified and scan time reduced by ~8%.
