Siemens 6ES7221-1BF22-0XA8
Siemens 6ES7221-1BF22-0XA8
Siemens 6ES7221-1BF22-0XA8
Siemens 6ES7221-1BF22-0XA8
Siemens 6ES7221-1BF22-0XA8
Siemens 6ES7221-1BF22-0XA8
Siemens 6ES7221-1BF22-0XA8
Siemens 6ES7221-1BF22-0XA8
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6ES7221-1BF22-0XA8

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The 6ES7221-1BF22-0XA8 is a Siemens SIMATIC S7-200 digital input module with 8 DC inputs, 4 mA typical input current, 2 W power loss, and compact dimensions of 46 x 80 x 62 mm.
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Technical specifications for 6ES7221-1BF22-0XA8

  • Manufacturer:
    Siemens
  • Part Number:
    6ES7221-1BF22-0XA8
  • Product Family:
    Siemens Simatic S7-200
  • Product Type:
    Digital Input Module
  • Number of Digital Inputs:
    8
  • Typical Input Current (signal:
    4 mA
  • Power Loss (typ.):
    2 W
  • Weight:
    0.1 kg
  • Estimated shipping dimensions:
    4.8x6.2x9.5cm
  • Tariff Code:
    8517795000
  • Country of origin:
    Germany
  • Place of shipment:
    Xiamen, Fujian, China
By purchasing this item, you agree to the Terms & Conditions, ApterPower is not an authorized distributor for listed manufacturers or tradenames and therefore the manufacturer's warranty does not apply. All our products come with ApterPower's 1-year warranty.

More Information

Overview Manuals Specifications Application Operating Environment Monitoring and Control

Features:

  • Provides 24V DC input expansion for S7-200 systems; typical input current 4 mA per channel.
  • Only 2 W typical power loss; powered via expansion bus, no external supply needed.
  • The module is designed for DIN rail mounting, snapping directly onto standard 35 mm DIN rail.
The 6ES7221-1BF22-0XA8 provides 8 additional 24V DC digital input points for a SIMATIC S7-200 system. These inputs are used to connect field devices such as pushbuttons, limit switches, proximity sensors, and photoelectric sensors that output a 24V DC signal. The typical input current when the signal is “1” is 4 mA – low enough to be driven by most PLC outputs or sensor transistors without overloading. The inputs are not isolated, meaning they share a common reference (typically the 24V DC return). This is typical for basic S7-200 I/O modules and is acceptable for most applications where all sensors share the same power supply.

The 6ES7221-1BF22-0XA8 has a typical power loss of only 2 W, making it one of the most energy‑efficient expansion modules in the S7-200 lineup. This low power consumption is critical because S7-200 CPUs have a limited power budget for expansion modules. For example, a CPU 224 can provide up to 660 mA of 5V power to expansion modules, while each module draws a portion of that budget. The 6ES7221-1BF22-0XA8 draws a small fraction, allowing users to add several modules before reaching the CPU’s limit. The module receives all its power from the expansion bus, requiring no external 24V DC supply connection.

When planning cabinet layout, allow for at least 50‑60 mm of clearance in front of the module. The compact size is particularly valuable in retrofits, where existing cabinets may have limited free space. For engineers designing new panels, the 6ES7221-1BF22-0XA8 allows high I/O density in a small area. Despite its small size, the module includes all necessary status indicators (though not detailed in this document, typical S7-200 modules have LEDs per channel).

The 6ES7221-1BF22-0XA8 Siemens Digital Input Module may still be available for purchase and support from Apter Power beyond End-Of-Life (EOL)by the manufacturer (OEM).

Siemens 6ES7221-1BF22-0XA8 Digital Input Module Manuals, Datasheets,Drivers,Link Important Notice:Other accessories,manuals,cables,calibration data,software,etc.are not included with this equipment unless listed in the above stock item description.All prices are shown in USD.
Siemens 6ES7221-1BF22-0XA8 Digital Input Module Specs

General

  • Manufacturer Siemens
  • Model 6ES7221-1BF22-0XA8
  • Condition New Original ready stock
  • Product Family 6ES7221-1BH22-0XA8,6ES7221-1EF22-0XA0,6ES7222-1BF22-0XA8
Important Notice:Other accessories,manuals,cables,calibration data,software,etc.are not included with this equipment unless listed in the above stock item description.All prices are shown in USD.
  • Equipment-level signal acquisition: Used to connect to distributed devices such as sensors, limit switches, buttons, and photoelectric switches in the field.
  • Modular machinery control: Commonly used in packaging machinery, assembly lines, material handling, and equipment linkage control in smart factories.
  • System expansion: When the input points of the S7-22X CPU are insufficient, this expansion module increases I/O capacity.
  • Input Voltage: Nominal 24V DC. Signal "0" is 0 to 5V, signal "1" is +15 to +30V.
  • Input Current: Typical current for signal "1" is 4 mA.
  • Low Power Consumption: Typical power consumption is only 2 W.
  • Physical Characteristics: High shock and vibration resistance, with built-in overheat protection.
  • Bidirectional Compatibility (Sink/Source): The module supports both sink and source wiring, allowing for flexible adjustment based on the type of field sensors without requiring hardware replacement.
  • Address Management: In STEP 7-Micro/WIN software, the expansion module's I/O addresses are typically automatically allocated in 8-bit (1 byte) groups.
  • Response Characteristics: Features a typical response latency of approximately 30ms, ensuring stable reception of control commands.
Description
The 6ES7221-1BF22-0XA8 is a digital input module for the Siemens SIMATIC S7-200 family. It provides 8 DC input channels for connecting field devices such as pushbuttons, limit switches, and proximity sensors. 

When using the 6ES7221-1BF22-0XA8, engineers can expand the I/O capacity of an S7-200 CPU without replacing the main controller. The module is designed for 24V DC inputs, making it compatible with standard industrial sensors. It is a reliable choice for small to medium automation systems where additional digital input points are needed.

Its compact size allows installation in tight control cabinets. The module is typically mounted on a DIN rail alongside the S7-200 CPU and other expansion modules. 

For legacy S7-200 system expansions or repairs, the 6ES7221-1BF22-0XA8 remains a useful spare part. The S7-200 series has been superseded by the S7-1200, but many plants still operate these proven controllers. The module is simple to install and requires no external power supply – power is supplied via the expansion bus. 
Alternative Names
6ES7221-1BH22-0XA8 6ES7221-1EF22-0XA0 6ES7222-1BF22-0XA8 6ES7221-1BF22-OXA8
Technical notes
The 6ES7221-1BF22-0XA8 is a digital input module for SIMATIC S7-200 systems. It provides 8 DC inputs with a typical input current of 4 mA at signal “1”. The inputs are not isolated (common reference).The module receives its power from the S7-200 expansion bus – no external 24V DC supply is required for the module itself.
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FAQS

The following is a list of questions commonly asked by our customers. Please contact us if you have a question about our process that is not answered below.
How many inputs does the 6ES7221-1BF22-0XA8 add to my S7-200 system?
The 6ES7221-1BF22-0XA8 adds 8 DC digital inputs to your S7-200 system. It connects via the expansion bus and requires no external power supply. This allows you to expand I/O capacity without replacing the CPU.
How much power does the 6ES7221-1BF22-0XA8 consume?
The 6ES7221-1BF22-0XA8 has a typical power loss of only 2 W. It draws its power from the expansion bus, not from an external supply. This low consumption allows multiple modules to be added without overloading the CPU’s backplane power budget.
Which S7-200 CPUs are compatible with the 6ES7221-1BF22-0XA8?
The 6ES7221-1BF22-0XA8 is compatible with all S7-200 CPUs that support expansion modules (e.g., CPU 221, 222, 224, 226). The module connects to the right side of the CPU or another expansion module. Always check the maximum number of modules supported by your specific CPU.

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