Product Introduction

Model Interpretation

• 1SAP: ABB S500 I/O series

• 2840: Safety digital input (16‑channel, SIL2/3)

• 0001: Standard hardware revision B1

• DI581‑S: “DI” = digital input, “5” = AC500 platform, “81” = safety type, “S” = safety series.

Technical Parameters

• Configuration: 16 channels (SDI), SIL2 (16ch) / SIL3 (8ch) configurable

• Input: 24 VDC, 1‑wire, sink/source, 2 mA input current

• Safety: IEC 61508 SIL2/SIL3, EN 954‑1 Category 4

• Isolation: 2500 V AC between field and backplane

• Response Time: ≤ 1 ms (safety‑critical signals)

• Pulse Input: 8 channels support pulse counting (max 10 kHz)

• Power: 24 V DC ±10%, ≤ 2.5 W

• Operating Temperature: ‑40°C to +85°C (industrial extended range)

• Protection: IP20

• Dimensions (W×H×D): 67.5 mm × 76 mm × 62 mm

• Weight: 0.122 kg

• Mounting: 35 mm DIN rail.

Interface & Communication

• Wiring: Screw terminals (16 input channels + common)

• Backplane: AC500 safety bus (direct connection to CPU)

• Protocols: PROFIBUS DP, PROFINET, Modbus RTU (via PLC)

• LEDs: PWR (green), RUN (yellow), 16×CH (yellow), FAULT (red), SAFE (green).

Core Functions

• Safety Input: 16‑channel 24 VDC safety signal monitoring (emergency stop, safety gates, light curtains)

• SIL Mode Selection: Software switch between 16×SIL2 or 8×SIL3

• Pulse Counting: 8 channels for safety‑related pulse signals (encoders, flow meters)

• Diagnostics: Short‑circuit, open‑circuit, overvoltage, and temperature monitoring

• Safety Voting: Supports 1oo2/2oo2 voting for high‑safety applications.

Application Scenarios

• Safety Instrumented Systems (SIS): Emergency shutdown (ESD), safety interlocks

• Machine Safety: Safety gate monitoring, light curtains, emergency stop circuits

• Process Automation: SIL2/SIL3‑rated signal acquisition in chemical, oil & gas

• Packaging & Material Handling: Safety‑critical conveyor and machine guarding.

Operation & Maintenance

• Installation: DIN rail mount; 20 mm clearance for cooling

• Wiring: Shielded cables for safety signals; separate from power wires; torque 0.5–0.6 Nm

• Configuration: Automation Builder/CoDeSys for SIL mode and channel parameters

• Maintenance: Periodic terminal check; clean with dry cloth

• Troubleshooting: No PWR → 24 V supply; RUN flash → config error; CH alarm → field wiring fault; SAFE off → safety channel tripped.