Siemens SIMATIC S7-300 SM 322 Digital Output Module 16DA 24V DC 0.5A 6ES73221BH010AA0

Digital output module from the SIMATIC S7-300 series, delivering 16 isolated 24 V DC outputs at 0.5 A per channel for reliable control of actuators, valves, and indicator lamps. The SM 322 module ensures fast, short-circuit-proof switching and is engineered for demanding industrial automation environments.

Advantages

Each of the 16 outputs is electronically protected against short circuits and reverse polarity, with parameterizable diagnostics for wire break and supply voltage monitoring. The module supports resistive, inductive, and lamp loads, with a maximum switching frequency of 100 Hz for resistive loads. A 20-pole front connector simplifies wiring, and per-channel LEDs provide immediate status indication. The module is designed for DIN rail mounting and operates in horizontal or vertical orientation, with a total output current of 4 A and low power loss of just 4.5 W.

Suitable for

• Controlling solenoid valves, contactors, and relays
• Driving indicator lamps and small DC motors
• Integration into SIMATIC S7-300 PLC systems
• Applications requiring isolated digital outputs with diagnostic capabilities

Key specifications

• Number of digital outputs: 16
• Output voltage: 24 V DC
• Output current per channel: 0.5 A
• Total output current: 4 A
• Isolation: Yes
• Connection: 1x 20-pole front connector
• Short-circuit protection: Yes (electronic, parameterizable)
• Reverse polarity protection: Yes
• Load types: Resistive, inductive, lamp load
• Switching frequency (resistive): max. 100 Hz
• Operating temperature: 0 °C to 60 °C (horizontal), 0 °C to 40 °C (vertical)
• Power loss: max. 4.5 W
• Supply voltage: 24 V DC (from backplane bus)
• Current consumption from backplane bus: max. 100 mA
• Status indicators: LED per channel
• Diagnostic functions: Wire break, short circuit, supply voltage
• Mounting: DIN rail

Recommendations

For optimal performance, use the module with a compatible SIMATIC S7-300 CPU and ensure proper ventilation. The front connector (not included) should be ordered separately. Configure diagnostics via STEP 7 to leverage the module's full monitoring capabilities.