Product Overview

The SIMATIC S7-300 SM 322 Digital Output Module (MLFB: 6ES7322-1BH01-0AA0) provides 16 optically isolated transistor outputs (24 V DC, 0.5 A each) with sturdy screw-terminals via a 20-pole front connector. Built for reliability in standard automation, it supports grouped current handling and integrates seamlessly into S7-300 systems.
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Technical Specifications

Voltage & Power

Rated load voltage: 24 V DC (range: 20.4–28.8 V)
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Input current: max. 80 mA from both L+ and backplane bus
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Typical power loss: ~4.9 W
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Digital Outputs

Total outputs: 16, arranged in two optically isolated groups of eight channels each
Octopart
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Nominal output current: 0.5 A per channel; permissible range up to 0.6 A (0–60 °C)
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Residual (leakage) current (signal “0”): max. 0.5 mA
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Switching & Load Characteristics

Resistive load switching: up to 100 Hz

Inductive load: up to 0.5 Hz (IEC 60947-5-1 DC13)

Lamp load: up to 10 Hz

Lamp load max power: 5 W
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Protection & Redundancy

Electronic short-circuit protection at ~1 A threshold

Inductive voltage suppression: –53 V to L+
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Redundant output control possible—parallel the same group’s outputs (not for upping capacity)
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Performance Metrics

Output delay: “0”→“1”: max 100 µs; “1”→“0”: max 500 µs
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Isolation & Wiring Limits

Galvanic isolation between each group and backplane; groups of 8 isolated from each other
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Isolation test: 500 V DC
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Cable lengths: shielded up to 1000 m, unshielded up to 600 m
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Mechanical Details

Dimensions: 40 mm (W) × 125 mm (H) × 120 mm (D)
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Weight: ~190 g
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Lifecycle & Logistics

Lifecycle Status: Phasing out (PLM: PM400) as of 1 October 2023
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Availability: Ships ex-works within 1 day; net weight ~244 g; package ~ 12.8 × 15.3 × 5.0 cm
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Origin: Germany

Regulatory Compliance:

RoHS: Compliant since 31 March 2008

WEEE: Take-back obligation applies

REACH Article 33: Contains Lead and Lead Monoxide (>0.1 % w/w); considered safe when used/disposed as intended
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Classification Codes:

eClass: 27-24-22-04

ETIM: EC001419

UNSPSC: 32-15-17-05
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Technical Engineer Insights

High-Density Output Module
Compact design with 16 powerful outputs in one module simplifies layout and maximizes I/O density in the S7-300 lineup.

Strong Load Compatibility
Supports inductive, resistive, and lamp loads, while built-in protection ensures durability under varied industrial demands.

Robust Isolation Design
Opto-isolated groups protect the CPU and other modules from overload conditions and ensure consistent performance.

Long-Haul Signal Support
Support for long cable runs (up to 1000 m shielded) enables distributed architectures in large-scale setups.

Straightforward Upgrade Path
While the module is being phased out, its form factor and connector layout allow seamless replacement or migration in field service scenarios.

Suggested Product Page Description

SIMATIC S7-300 SM 322 Digital Output Module — 16-Channel, 24 V DC, 0.5 A (6ES7322-1BH01-0AA0)
A compact, router-optimized digital output solution delivering 16 optically isolated, 0.5 A transistor outputs in two isolated groups. Rated for 24 V DC loads, it offers protections against short circuits, inductive kick-back, and overload. With solid switching performance, front-LED status, and long cable run support, it’s ideal for standard industrial I/O needs. Despite being phased out, it remains a reliable spare with full functional continuity.

Key Features:

16 digital outputs (0.5 A each), arranged in 2 opto-isolated banks of 8

Wide voltage range: 20.4–28.8 V DC; efficient power draw

Short-circuit and inductive load protection with suppression

Fast response: ≤100 µs ON, ≤500 µs OFF

Long-distance interface: shielded up to 1000 m

Compact (40 × 125 × 120 mm); German-made; quick lead time

Conforms to RoHS, WEEE, REACH; ideal for SM 322 replacement or retrofit plans