Product Details

Modicon AS-BDAP-21 is a rugged discrete output module and reliable digital switching card belonging to the Modicon 800 series I/O family, designed for legacy Modicon 984 automation racks. This isolated output card converts internal logic signals from the PLC CPU into field drive signals to control solenoid valves, indicator lights, contactors and other low-power actuators. Built with galvanic isolation between the backplane and field wiring, it blocks voltage surges and ground-loop noise, protecting the main controller from external electrical transients. Each output channel features status LED indication for quick visual troubleshooting, and the compact single-slot form factor saves valuable rack space. As a discontinued legacy spare, this discrete output module serves as a drop-in replacement for failed I/O hardware, restoring dependable on-off control for ageing production systems without rack modification.

Basic Parameters

Brand: Modicon (Gould / AEG legacy)

Model: AS-BDAP-21

Product Type: Isolated Discrete Output Module

Compatible Rack: Modicon 800 series backplane, Modicon 984 PLC racks

Channel Type: Isolated discrete output

Indicator: Onboard LED for each channel status

Termination: Screw terminal block

Form Factor: Single slot rack mount

Product Status: Discontinued legacy spare

Net Weight: Approximately 0.62 kg

Supported Functions

This discrete output module receives command signals over the PLC backplane and independently switches each digital output channel. The digital switching card provides electrical isolation, channel status indication and transient suppression for field loads. This isolated output card supports continuous cyclic switching under normal industrial duty, cooperates with the host CPU to execute sequential actuation, alarm signalling and interlock control. It supports hot swap under proper power management and helps isolate short-circuit faults so that a faulty load will not crash the whole PLC rack. Built-in self-check routines assist technicians during commissioning and routine maintenance.

Core Functions

As a dedicated digital switching card, this discrete output module translates controller logic states into usable drive signals for field devices. Its isolation barrier prevents destructive surges and noise from travelling back to the PLC backplane. This isolated output card acts as a direct spare to recover stable digital output control for ageing Modicon automation racks.

Hardware Specifications & Environmental Features

Operating Temperature: -10°C ~ +60°C

Storage Temperature: -20°C ~ +70°C

Relative Humidity: 5%–95%, non-condensing

Housing: Heavy-duty industrial plastic and metal module shell

Protection: Channel transient voltage suppression, isolation barrier

Anti-interference: Galvanic isolation between backplane and field side

Compatibility: Matches 800 series backplane and compatible peripheral modules

Industry Applications: Applied in legacy petrochemical distributed control, old paper making production automation, material handling conveyor lines, packaging and textile machinery, water treatment remote signal collection and large conveyor remote I/O control racks.

Note: Confirm backplane compatibility, load voltage rating and maximum inrush current before ordering.

This is from our current stock.

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