Siemens SIMATIC S7-1200 SB 1221 Stellwerk (6ES7221-3BD30-0XB0)

Siemens SIMATIC S7-1200 SB 1221 Signal Board

Part Number: 6ES7221-3BD30-0XB0

The Siemens SB 1221 Signal Board is a compact expansion module designed to add additional digital input or output channels to S7-1200 CPUs. It provides a space-saving alternative to full-size signal modules.

The module is directly attached to the CPU, making it ideal for small expansions where cabinet space is limited and only minimal additional I/O is required.

Key Features

• Direct CPU-mounted expansion
• Compact and space-saving design
• Additional digital I/O capability
• Full integration with TIA Portal

Applications

• Small machine upgrades
• Minimal I/O expansion tasks
• Compact automation systems
• Cost-efficient PLC extensions