• Siemens SIMATIC S7-1200 digital signal boards (SB 1221/1222/1223)
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Siemens SIMATIC S7-1200 digital signal boards (SB 1221/1222/1223)

Siemens SIMATIC S7-1200 digital signal boards (SB 1221/1222/1223)

Digital signal boards plugged into the front of SIMATIC S7-1200 CPUs to add I/O without increasing the footprint.

Key features

  • Plugs into the CPU front slot - no additional mounting space
  • Up to 200 kHz high-speed I/O
  • 5 V DC and 24 V DC versions
  • SB 1221 inputs, SB 1222 outputs, SB 1223 combined I/O

Specifications

Brand Siemens
Product line SIMATIC
Series SIMATIC S7-1200
Form factor Signal board (CPU front slot)
Max. frequency 200 kHz (high-speed versions)
Terminal block Gold-plated, 6-pin
Engineering STEP 7 (TIA Portal)
Source Siemens Catalog ST 70 · 2026, p. 175-189
6ES7221-3AD30-0XB0 Board: SB 1221 | Channels: 4 DI | Rating: 5 V DC 200 kHz, sourcing
6ES7221-3BD30-0XB0 Board: SB 1221 | Channels: 4 DI | Rating: 24 V DC 200 kHz, sourcing
6ES7222-1AD30-0XB0 Board: SB 1222 | Channels: 4 DQ | Rating: 5 V DC 200 kHz
6ES7222-1BD30-0XB0 Board: SB 1222 | Channels: 4 DQ | Rating: 24 V DC 200 kHz
6ES7223-0BD30-0XB0 Board: SB 1223 | Channels: 2 DI / 2 DQ | Rating: 24 V DC
6ES7223-3AD30-0XB0 Board: SB 1223 | Channels: 2 DI / 2 DQ | Rating: 5 V DC 200 kHz
6ES7223-3BD30-0XB0 Board: SB 1223 | Channels: 2 DI / 2 DQ | Rating: 24 V DC 200 kHz
PLC I/O ModulesSiemens
7 product codes available in this family
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Siemens SIMATIC S7-1200 digital signal boards (SB 1221/1222/1223)

Brand Siemens·PLC I/O Modules

Available part numbers (7)

6ES7221-3AD30-0XB0, 6ES7221-3BD30-0XB0, 6ES7222-1AD30-0XB0, 6ES7222-1BD30-0XB0, 6ES7223-0BD30-0XB0, 6ES7223-3AD30-0XB0, 6ES7223-3BD30-0XB0

How to order

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Product codes & specifications
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Product codeSpec
6ES7221-3AD30-0XB0Board: SB 1221 | Channels: 4 DI | Rating: 5 V DC 200 kHz, sourcing
6ES7221-3BD30-0XB0Board: SB 1221 | Channels: 4 DI | Rating: 24 V DC 200 kHz, sourcing
6ES7222-1AD30-0XB0Board: SB 1222 | Channels: 4 DQ | Rating: 5 V DC 200 kHz
6ES7222-1BD30-0XB0Board: SB 1222 | Channels: 4 DQ | Rating: 24 V DC 200 kHz
6ES7223-0BD30-0XB0Board: SB 1223 | Channels: 2 DI / 2 DQ | Rating: 24 V DC
6ES7223-3AD30-0XB0Board: SB 1223 | Channels: 2 DI / 2 DQ | Rating: 5 V DC 200 kHz
6ES7223-3BD30-0XB0Board: SB 1223 | Channels: 2 DI / 2 DQ | Rating: 24 V DC 200 kHz

Need a different model, or a part not listed here? Send us your parts list →

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