ABB DO524 A3

ABB DO524 A3

Product Brief:​ The DO524 (often referenced as DO524 A3 in AC500/S500 I/O catalogs) is a 32-channel digital output module for ABB AC500 PLC systems and S500 remote I/O stations. It provides 32 sourcing (PNP-type) transistor outputs, each rated 0.5 A at 24 V DC, with short-circuit and overload protection. The module connects via spring-cage terminals using 1-wire-per-output plus common power/return rails.

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Category: SKU: ABB DO524 A3

Description

ABB DO524 A3

  • Technical Specifications:
    • Output Channels: 32 (transistor, NPN high-side sourcing)
    • Output Voltage: 24 V DC (20.4–28.8 V DC rated)
    • Output Current: 0.5 A per channel continuous; total module max ≈8 A (derate per group / ambient)
    • Output Type: Current sourcing (PNP), short-circuit proof, overload protected, auto-recover
    • Voltage Drop (ON): <0.8 V at rated current
    • Turn-on/off Time: <1 ms
    • Isolation: Galvanic isolation between logic side and field side (test 500 V AC)
    • Process Supply (UP): 24 V DC via terminals (fused max 10 A fast)
    • Current Consumption from CPU: ≈2 mA + load current from UP
    • Power Dissipation: Max ≈6 W (unloaded); higher with load
    • Indicators: 1 yellow LED per channel (ON = output active) + module status LED
    • Mounting: 35 mm DIN rail (horizontal or vertical with derating — at +40 °C vertical, reduce load to 50 %)
    • Dimensions: ≈62 × 76 × 68 mm (W × H × D); weight ≈0.1 kg
    • Protection: IP20, reverse polarity protection on process supply, temporary overvoltage ≤30 V DC
    • Max Field Cable Length: 600 m unshielded / 1000 m shielded (per ABB recommendation)
    • Certifications: CE, UL, cUL, RoHS
  • Functional Features:
    • 32 high-density outputs in one slim module — minimizes panel space
    • Individual channel short-circuit protection with automatic reset after fault clears
    • Diagnostic LEDs for rapid troubleshooting
    • Reverse polarity and overvoltage protection on process supply terminals
    • Compatible with AC500 CPUs (PM5xx) and CS31 / Profibus / Ethernet remote I/O heads (S500)
  • Application Scenarios:
    • Packaging / bottling lines — solenoid valve and indicator beacon control
    • Conveyor system divert gate / stopper actuation
    • Building automation — lighting, damper, fan contactor control
    • Machine tools — coolant pump start, indicator lamps, small DC loads
  • Material & Structure:
    • Housing: Flame-retardant polyamide (PA66) gray, DIN-rail clip integrated
    • Terminals: Cage-clamp / spring-pressure, tin-plated brass
    • PCB: FR4 with solder mask and conformal coat option
  • Working Principle:

    The module receives output image bits from the AC500 CPU via the local bus or fieldbus interface. Each bit controls a protected P-channel MOSFET high-side driver which connects the output terminal to the UP (+24 V) process supply when ON, and disconnects it when OFF. Short-circuit is detected by monitoring MOSFET voltage drop; excessive current forces the channel into limitation and latches a fault until the condition is removed and the output is re-enabled by the CPU.

  • Installation Requirements:
    • Snap onto 35 mm DIN rail in panel; leave ≥10 mm above/below for ventilation
    • Wire +24 V DC process supply to UP terminals, 0 V to ZP terminals observing polarity
    • Connect field load between output terminal and 0 V return
    • Torque terminals to manufacturer spec (typically 0.5–0.6 N·m)
    • In vertical mounting above +40 °C ambient, apply load derating (max 50 % of rated per channel)
  • Precautions:
    • Total continuous current must not exceed module/wiring fuse rating — distribute load evenly across channels
    • Do NOT connect AC voltage to outputs — DC-only, will be damaged
    • For inductive AC loads (contactors, relays), use interposing DC relay with flyback diode or snubber on coil
    • Ensure process supply fuse ≤10 A fast-blow — larger fuses compromise module short-circuit protection

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