KEBA DO321/16 (DO321) Digital Output Module

KEBA DO321/16 (DO321) Digital Output Module

(KeControl P30 Series, 16 channels / 24V DC / 0.5A) I. Product Overview

KEBA DO321/16 (often written as DO321) is a 16-channel digital output module designed by Austria-based KEBA for the KeControl P30 series. It is used to convert controller instructions into 24V DC switching signals, to drive solenoids, relays, contactors, indicator lights, etc., and is widely used in injection molding, die-casting, packaging, machine tools, and automated production lines.

Note: It and the K2-200 series' DO272/A, DO242/A belong to different platforms and are not interchangeable. 

II. Core Functions

16 Independent Outputs

Each output can be independently switched. 24V DC source type (PNP) transistor output.

Single output 0.5A / Total current 4A

Suitable for solenoids, small hydraulic valves, indicator lights; short circuit / overload protection, automatic shutdown in case of faults.

Fast Response

Typical <100µs, friendly for high-speed operation control scenarios. Electrical isolation

The channels are electrically isolated from each other and from the system side, with strong anti-interference capability.

Status indication

Each green LED: Always on = ON, Off = OFF; Some versions come with a common fault LED.

Multiple protections

Short circuit, overload shutdown, reverse polarity protection.

DIN rail installation

Standard rail, flexible layout within the cabinet.

III. Technical parameters (official data)

Model: DO321/16 (DO321)

Series: KeControl P30

Number of channels: 16 digital outputs

Output voltage: 24V DC (external power supply)

Single channel current: 0.5A

Total module current: 4A (suggested ≤ 3.2A continuous)

Response time: <100µs (typical)

Isolation: Photoelectric isolation (between channels and system side)

Indication: Each green LED + common fault LED

Protection: Short circuit, overload, reverse polarity

Operating temperature: −25°C ~ +60°C

Storage temperature: −40°C ~ +70°C

Protection level: IP20

Installation: DIN rail (EN 60715)

Size (width × height × depth): Approximately 45mm × 120mm × 100mm

Weight: Approximately 200g

Certification: CE, RoHS

IV. Differences from K2-200 series DO272/A (Key points)

Platform: DO321 → P30; DO272/A → K2-200 (not interchangeable)

Channels: DO321 16 channels; DO272/A 14 channels

Single channel current: DO321 0.5A; DO272/A 2A (significantly lower driving capability)

Power supply: DO321 external 24V; DO272/A K-bus bus power supply

Installation: DO321 DIN rail; DO272/A backplane slot

V. Typical applications

Injection / die-casting machines: Control solenoid valves, mold cooling, ejection / mold closing signals

Packaging / logistics: Sorting devices, conveyor belts, fixture control

Machine tools / machining centers: Cooling pumps, lubrication pumps, indicator lights, alarm circuits

General automation: 24V DC relays, contactors, small solenoid valves, indicator lights

VI. Wiring essentials

Power supply: External 24V DC power supply (L+, 0V)

Output:

O1～O16 → Positive pole of the load

Negative pole of the load → 24V DC 0V

Inductive loads: Suggestion to parallel a 1N4007 diode for electromagnetic valves / relays

Wire diameter: 0.5～1.5mm², separate strong and weak current wiring

VII. Fault quick check

某 channel's LED does not light up： No output from the channel → Check external power supply， wiring， load， program

Common fault LED lights up： Short circuit / overload → Power off and check the circuit and load

Incorrect operation： Poor grounding， interference， no current-limiting diode for inductive loads