Product Overview

SIMATIC S7-300 Digital Output Module – SM 322 (6ES7322-1BL00-0AA0)
A high-density digital output module suited for the S7-300 PLC family. Provides 32 isolated transistor outputs (grouped in 4 sets of 8), each operating at 24 V DC with a maximum 0.5 A per channel. The module handles up to 4 A per group and 16 A total per module. Designed with optical isolation and a 40-pin front connector.

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Technical Specifications
Attribute Details
Number of Outputs 32 digital outputs
Output Voltage 24 V DC (range: 20.4–28.8 V)
Current per Channel (Signal “1”) 0.5 A nominal, max 0.6 A (0–60 °C); minimum load 5 mA
Total Current per Group Horizontal up to 40 °C: 4 A; up to 60 °C: 3 A; vertical up to 40 °C: 2 A
Total Module Current Up to 16 A (4 A × 4 groups)
Input Current (no load) Load voltage: max 160 mA; backplane bus 5 V: max 110 mA
Power Loss Typical: ~6.6 W
Switching Speed ON delay: max 100 µs; OFF delay: max 500 µs
Switching Frequency Resistive: 100 Hz; Inductive: 0.5 Hz; Lamp: 10 Hz
Cable Length (Output) Shielded: up to 1000 m; Unshielded: up to 600 m
Short-Circuit Protection Electronic, with ~1 A response threshold
Load Types Supported Resistive, inductive, lamp loads (max 5 W)
Indicators (LEDs) Green per-channel status LEDs; no diagnostic LEDs for PWR or faults
Isolation Optically isolated per group and from backplane; tested to 500 V DC
Dimensions & Weight WxHxD: 40 × 125 × 120 mm; Weight: ~260 g

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Product Lifecycle & Ordering Info

Lifecycle Status: Phase-out announced, effective since 01 October 2023 (PLM: PM400)

Lead Time: Typically ships in 1 day (ex-works)

Net Weight: Approx. 0.309 kg (incl. packaging)

Packaging Dimensions: 12.8 × 15.2 × 5.0 cm

Country of Origin: Germany

RoHS Compliant: Since 31 March 2008

WEEE Take-Back: Applicable

REACH Article 33: Contains lead and lead monoxide > 0.1% w/w—safe under normal use

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Engineering Insight

High-Density Output Efficiency
This module provides 32 outputs in a compact 40 mm footprint, making it ideal for dense I/O configurations in control panels.

Robust Control Characteristics
Offers fast switching, electronic short-circuit protection, and support for varied load types—ensuring reliability across applications.

Extended Cable Support
Capable of driving long runs (up to 1 km shielded), suiting installations with remote actuators or distributed field components.

Simplified Diagnostics & Safety
Visual status via per-channel LEDs aids quick troubleshooting; optical isolation enhances system integrity.

Lifecycle Consideration
With the phase-out begun in 2023, plan ahead for replacements or stock spare modules to support existing installations.