Description
Honeywell SDOL-0424
Technical Specifications Brand: Honeywell Model: SDOL-0424 Channel Quantity: 4 digital output channels Output Type: 24 VDC discrete output Rated Output Current per Channel: 0.5 A Channel Isolation: Group isolation Operating Supply: 24 VDC power supply Operating Temperature: 0°C to +70°C Humidity: 5% to 95% non-condensing Protection Grade: IP20 cabinet mounting Mounting: Hot pluggable rack card Backplane: Honeywell DCS rack internal bus
Functional Features 4 independent 24 VDC digital output channels to drive field solenoid valves and relay coils. Galvanic isolation between field load circuit and DCS control bus. Built-in channel fault diagnosis function detects short circuit and overload of field loop. Front panel LED indicators display channel output status. Receive control command from main controller via backplane bus. Hot pluggable design allows module replacement without whole system shutdown. Overcurrent protection for each output channel.
Application Scenarios Chemical plant solenoid valve control, refinery safety interlock actuation, water treatment plant pump start-stop relay control, power plant auxiliary valve sequence control.
Performance Parameters Fast response to digital control command from controller. Overcurrent protection cuts off output immediately when field short circuit occurs. High electromagnetic interference resistance in process plant environment. Stable output drive capability for inductive loads such as solenoid coils. Accurate fault reporting of field load loop failure.
Material Composition Front Panel: Flame retardant ABS plastic with LED indicators. PCB: FR4 multilayer printed circuit board with conformal coating. Core Components: Optocoupler, power drive chips, overcurrent protection components, bus communication IC. Back Connector: Gold plated edge connector. Field Terminals: Screw clamp plastic terminal block.
Structural Features Rack plug-in card design with rear gold finger for backplane connection. Front panel with LED status indicators for each channel. Side plastic latches lock module inside rack slot. Isolation components separate field load circuit and system control circuit. PCB layout isolates high-current drive circuit and low-speed communication circuit.
Working Principle DCS controller sends digital on-off command to module via rack backplane bus. The onboard drive chip converts logic command into 24 VDC output signal to drive field load. Optocoupler provides isolation between system side and field side. Diagnostic circuit continuously monitors output channel current, triggers protection and sends fault alarm once overload or short circuit appears.
Installation Requirements Cut off rack power before inserting module into rack slot. Lock side latches firmly after module installation. Wire field solenoid or relay loads to output terminals. Add freewheeling diode for inductive field loads. Separate field output wiring from high voltage power cables. Reserve ventilation space inside rack.
Usage Notes Wear anti-static wristband when replacing module. Do not exceed rated current of each output channel. Check field load loop for short circuit before power on. Prevent cabinet condensation. Save system configuration before module maintenance work.
