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Communication Protocols Profibus Mounting Type Rack Mount Output Type Digital Manufacturer SeriesS7 400 SIMATIC S7-400, digital output SM 422, isolated 32 DO; 24 V DC, 0.5 A with 0.15 ms output delay, diagnostics 

SIMATIC S7-400 – SM 422 Digital Output Module

Part No.: 6ES7422-7BL00-0AB0
Type: 32 Digital Outputs, Isolated, 24 V DC / 0.5 A, Diagnostic Functions

Supply Voltage

• Rated load voltage (L+): 24 V DC

• Permissible range: 20.4 … 28.8 V

• Current from L+ (no load): max. 120 mA

• Backplane bus current (5 V): max. 200 mA

Power Loss

• Typical: 8 W

Digital Outputs

• Number of outputs: 32

• Short-circuit protection: Yes (electronically clocked)

  • Response threshold: 0.75 … 1.5 A

• Inductive shutdown voltage: Limited to L+ (–45 V)

• Controlling a digital input: Possible

Switching Capacity

• Lamp load: max. 5 W

Load Resistance Range

• Lower limit: 48 Ω

• Upper limit: 4 kΩ

Output Voltage

• Signal “1”: ≥ L+ – 0.8 V

Output Current

• Rated (signal “1”): 0.5 A

• Permissible range: 5 mA … 600 mA

• Signal “0”: residual current max. 0.5 mA

Parallel Switching

• For uprating: Yes (same group only)

• For redundancy: Yes (same group only)

Switching Frequency

• Resistive load: max. 100 Hz

• Inductive load: max. 2 Hz

• Lamp load: max. 2 Hz

Total Current per Output Group

• Up to 40°C: max. 4 A

• Up to 60°C: max. 2 A

Cable Length

• Shielded: max. 1000 m

• Unshielded: max. 600 m

Diagnostics & Status

• Diagnostics: Yes (parameterizable)

• Diagnostic alarm: Yes

• Hardware interrupt: Yes

• Diagnostic information readable: Yes

• Wire break detection: Yes (< 0.15 mA)

• Short-circuit detection: Yes (>1 A)

LED Indicators

• INTF (internal fault) – Red

• EXTF (external fault) – Red

• Output status – Green

Isolation / Potential Separation

• Channel-to-channel: Yes

• In groups of 8 channels

• Channels to backplane bus: Yes

• Tested with 500 V DC

Mechanical Data

• Width: 25 mm

• Height: 290 mm

• Depth: 210 mm

• Weight: approx. 600 g 

Technical Details