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6ES7221-3BF50-0XB0, Siemens, SIMATIC S7-1200 G2 SB 1221, signal board 8x digital inputs 24 V DC, 100 kHz

Cat. no.: 6ES7221-3BF50-0XB0

Manufacturer: Siemens

On request

Our price excl. VAT: 62,98 €
incl. VAT 21 %: 76,20 €

Recycling fee 5-32-1 (0,041 €/kg) 0,00 €

Weight 0.05 kg

HS Code (Taric) 85389091

Country of origin CN

Description

In stock · Stock items are shipped the next working day · Official Siemens distributor · Free technical support

Description · Parameters · Wiring · What else to buy · Documentation · FAQ

6ES7221-3BF50-0XB0 – SIMATIC S7-1200 G2, SB 1221 – 8x digital inputs 24 V DC, 100 kHz, Siemens

6ES7221-3BF50-0XB0 is a second-generation SB 1221 signal board for the Siemens SIMATIC S7-1200 G2 with 8x digital inputs 24 V DC, 100 kHz.

The SB 1221 signal board is mounted directly in the front of the CPU S7-1200 G2 (under the top cover) and therefore takes up no additional space on the DIN rail – compared with SM modules it is suitable for a small addition of signals without increasing the width of the assembly.

Key advantages
Mounted directly in the CPU, needing no additional space on the rail.
Quick replacement without disconnecting other modules.
Each CPU S7-1200 G2 supports one SB/CB/BB slot.
Compatible with all CPUs of the series S7-1200 G2.
Technical specifications
Order number (MPN) 6ES7221-3BF50-0XB0
Manufacturer Siemens
Type SIMATIC S7-1200 G2, SB 1221
Properties 8x digital inputs 24 V DC, 100 kHz
Supply from the CPU (no external power supply)
Net weight 0.05 kg
Mounting CPU front (SB/CB/BB slot)
Operating temperature −20 to +55°C, non-condensing
Standards and approvals CE, UL, cULus; developed according to IEC 61131
Typical applications

The board is suitable for adding a small number of signals (e.g. one extra analogue channel, a few fast inputs) where a whole SM module would be unnecessarily large and expensive.

Which assembly it belongs to

The SB 1221 board is part of the assembly Siemens SIMATIC S7-1200 G2. Each CPU has only one slot for SB/CB/BB – if you are already using it with another board, you must choose between them or add the signals with an SM module.

Technical specifications

Order number	6ES7221-3BF50-0XB0
Manufacturer	Siemens
Product series	SIMATIC S7-1200 G2, SB 1221
Properties	8x digital inputs 24 V DC, 100 kHz
Mounting	CPU front (SB/CB/BB slot)
Weight	0.05 kg
Compatibility	SIMATIC S7-1200 G2 CPU (1212C, 1214C, incl. FC)

Wiring diagram and example

Indicative wiring diagram for this board type. For an actual installation, always work from the current datasheet.

Digital input (PNP, sourcing): +24V ----+---[ PNP sensor ]---- DIx.x | 0V -----+------------------------ 1M

What else to buy for this board

The board belongs to an assembly with any CPU SIMATIC S7-1200 G2. Recommended related components:

6ES7212-1AG50-0XB0 – CPU 1212C DC/DC/DC
Smaller CPU with one SB/CB/BB slot for this board.
6ES7214-1AH50-0XB0 – CPU 1214C DC/DC/DC
Larger CPU, if you also plan further expansion with SM modules.
6ES7822-0AE25-0YA5 – STEP 7 Basic V21, programming software
Required for configuring the board in TIA Portal.
SIMATIC S7-1200 G2 textbook – a guide to parameters and programming written in Czech
Explains the difference between an SB board and an SM module and when to choose which.

Official Siemens documentation

The documents open directly in the manufacturer's sources and relate to the order number 6ES7221-3BF50-0XB0.

Frequently asked questions

How do I verify the correct variant?

Compare the full order number 6ES7221-3BF50-0XB0 and the signal type (8x digital inputs 24 V DC, 100 kHz). A similar name (SB 1221, SB 1223 etc.) is not enough – the variants differ in voltage and speed.

Can several signal boards be used on one CPU?

No, the CPU S7-1200 G2 has one slot for SB, CB or BB. For a larger number of additional signals, use an SM module.

Is the board compatible with the original S7-1200 series?

No. The G2 generation uses its own range of boards with the order number suffix -50-0XB0, which is not interchangeable with the original series S7-1200.

Is mounting difficult, or are special tools needed?

No, the board slides into the front of the CPU under the hinged cover without tools. Replacement takes a few tens of seconds.

Alternative Kinco solution

For a new application, we can also design a Kinco control solution. Send us the application parameters; this is not an automatic direct one-for-one replacement.

TECHNOLINE is an official Siemens distributor. We supply with an invoice, technical support and help with choosing the correct variant.

Technical parameters

Objednací kód	6ES7221-3BF50-0XB0
Výrobce	Siemens
Input type and count (I)	8DI

Ask about this product

Ask us about technical parameters, compatibility with your equipment, availability or a price for larger quantities. It helps if you tell us what application you need the product for — if it does not fit, we will recommend a more suitable type.

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