Model Interpretation

• AS: Modicon Automation System

• B833: 16‑point 24VDC true‑low input module

• 016: 16 points, 2×8 common groups, enhanced input rating, upgraded diagnostics

Technical Parameters

• Inputs: 16 channels, 24VDC true‑low (sinking/NPN)

• Operating Voltage: 20–28VDC (field supply)

• Input Current: 6mA per point (wetting current @24VDC)

• Input Impedance: <200Ω (ON); >10kΩ (OFF)

• Logic Levels:

  • Signal 0: ≤5VDC

  • Signal 1: ≥15VDC

• Isolation: Optical coupling, 1500VAC channel‑to‑backplane

• Response Time: ≤1ms (ON/OFF)

• Backplane Power: +5V 160mA; +4.3V 1mA

• Operating Temp: 0°C to +60°C

• Storage Temp: -40°C to +85°C

• Humidity: 5%–95% non‑condensing

• Vibration/Shock: 1g / 15g

• Ingress Protection: IP20

• Weight: ≈1.25kg (2.75lbs)

• Dimensions: 50×119×125mm

• Origin: France

Interface & Configuration

• Backplane: Modicon 800/984 I/O bus

• Terminals: Screw terminals (16 inputs, 2 common groups ×8)

• Indicators: 16 LEDs (ON when input active)

• Fuses: 1× internal non‑replaceable fuse (per module)

• Wiring: 0.5–2.5mm² copper wires

• Terminal Connector: AS‑8534‑000

Core Functions

• 24VDC True‑Low Input: Active‑low logic for direct interface with standard 24V sensors/switches

• Dual Common Groups: 2×8 isolated groups for flexible signal routing

• Optical Isolation: Protects PLC from field‑side electrical noise and faults

• Fast Response: 1ms sensing for high‑speed on/off signals

• Enhanced Diagnostics: Improved LED visibility and fault indication

• High Wetting Current: 6mA ensures reliable contact sensing for dry/corroded switches

Applications

• Systems: Modicon 800, 984, 300‑series PLCs

• Industries: Material handling, packaging, textile machinery, general automation

• Use Cases: 24V proximity sensors, limit switches, pushbuttons, relay contacts, safety interlocks

Compatibility

• Racks: Modicon 800/984 8/11‑slot backplanes

• CPUs: AS‑984B‑128, PC‑E984‑685, AS‑9370‑001

• Software: Concept, ProWORX 32, P190