Model Definition

• AS: Modicon Automation System component

• B803: 8‑point discrete AC input module

• 008: 115VAC, 8 points, 1 point per isolated common (8 groups total)

Technical Specifications

• Points: 8 discrete input channels (8 isolated groups × 1 point/common)

• Input Voltage: 80–130VAC, 47–63Hz

• Input Current: ≈2mA per channel (on‑state)

• Response Time: 12ms typical, 18ms max (ON→OFF)

• Isolation: Channel‑to‑backplane isolation, 500VAC

• Operating Temperature: 0°C to +60°C

• Storage Temperature: −40°C to +70°C

• Humidity: 5%–80% non‑condensing

• Protection Class: IP20

• Dimensions: 125 × 90 × 75mm (W×H×D)

• Weight: ≈0.91kg

Interface & Configuration

• Backplane: Modicon 800/984‑series I/O bus

• Terminals: Screw terminals (8 inputs, 8 isolated common lines)

• Indicators: LED status per channel (ON when input active)

• Mounting: DIN rail or 19‑inch rack

• Wiring: 0.5–2.5mm² copper wires

• Fusing: One fuse per group (field‑side protection)

Core Functions

• 115VAC Signal Sensing: Reads standard AC industrial on/off signals

• Fully Isolated Channels: 8 independent groups for maximum noise immunity

• LED Status Indication: Quick visual diagnostics per channel

• Surge Protection: Built‑in suppression for inductive noise

• Hot‑Swappable: Insert/remove under power (rack dependent)

Application Scenarios

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

• Industries: Manufacturing, process control, material handling, packaging

• Use Cases: Limit switch sensing, pushbutton/selector input, relay contact monitoring, AC status signal acquisition

Compatibility

• Racks: Modicon 800/984/300‑series 8/11‑slot backplanes

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

• Software: Concept, ProWORX 32, P190

Status

• Discontinued: Obsolete, no longer manufactured

• Availability: Refurbished/used or new surplus units with 1–2 year warranty