Product Details

Modicon AS-B838-032 is a high-density discrete output module and rugged digital output card belonging to the Modicon 800 series I/O family, compatible with Modicon 984 PLC racks. This true-high output card provides thirty-two 24 VDC true-high switching outputs, separated into four groups with eight channels each, to drive relays, indicator lamps, solenoid valves and other low-power field actuators according to logic commands from the main CPU. Each channel converts internal PLC logic signals into usable field drive signals, and every group is equipped with independent fuse protection to restrict fault spread across channels. With fast response speed and built-in optical isolation, this discrete output module protects the PLC backplane from voltage transients and load surges. As a discontinued legacy spare, this digital output card serves as a drop-in replacement for failed high-density I/O hardware, helping ageing automation racks restore reliable on-off control without rack redesign.

Basic Parameters

Brand: Modicon

Model: AS-B838-032

Product Type: 32-Point 24 VDC True-High Discrete Output Module

Compatible Rack: Modicon 800 series backplane, Modicon 984 PLC

Output Count: 32 channels, divided into 4 banks × 8

Operating Voltage: 20–28 VDC

Rated Current: 0.5 A per channel; 4 A per group; maximum 12 A for the whole module

Response Time: 1 ms from OFF to ON, 1 ms from ON to OFF

Backplane Power: +5 V, 160 mA

External Supply: 24 ±4 VDC

Terminal Connector: AS-8535-000

Mounting: Single slot rack mounting

Product Status: Discontinued legacy spare

Net Weight: Approximately 1.09 kg

Supported Functions

This discrete output module receives logic instructions transmitted over the PLC backplane and independently toggles each digital output channel. The digital output card carries channel status indication, group fuse protection and optical isolation between field loads and control logic. This true-high output card supports continuous cyclic switching, and it can work with the host CPU to execute sequential actuation, alarm indication and interlock control. It supports hot swap under proper power management and provides clear fault isolation if short-circuit or overload occurs on any output bank, simplifying on-site troubleshooting.

Core Functions

As a high-density digital output card, this discrete output module translates internal controller logic signals into 24 VDC drive signals for field devices. Its grouped fusing and galvanic isolation limit fault propagation and suppress electrical noise returning to the main rack. This true-high output card acts as a direct spare to recover high-channel-count digital switching 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: Compact industrial metal and plastic module shell

Protection: Per-bank fuse protection, transient voltage suppression

Anti-interference: Opto-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 800 series backplane compatibility, pulse signal type, counting mode and preset logic before ordering.

This is from our current stock.

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