The Siemens SIMATIC S7-200 CPU 226 PLC (6ES7216-2BD23-0XB0) is a compact programmable logic controller designed for industrial automation, machine control, and process sequencing. It combines an AC power supply, 24 integrated digital DC inputs, and 16 relay outputs in a single controller, making it suitable for larger control tasks within compatible Siemens S7-200 automation systems.

The CPU 226 processes signals from sensors, push buttons, switches, and other field devices according to the programmed logic. Its relay outputs can switch compatible AC or DC loads within the manufacturer's specified electrical ratings. The integrated I/O reduces the need for separate digital I/O modules in applications that fit the controller's built-in capacity.

The controller provides up to 24 KB of program memory, with 16 KB available when runtime editing is active, and 10 KB of data memory. Two integrated serial interfaces support PPI, MPI-related communication, and freeport serial communication, subject to the protocol and configuration requirements. Compatible expansion modules can add further digital I/O and supported system functionality.

The CPU 226 is intended for industrial machinery, process-control equipment, and maintenance of existing S7-200 installations. Siemens identifies this model as a spare part and its product lifecycle as discontinued, so availability may depend on remaining stock and industrial spare-parts suppliers.

Key Features

• Siemens SIMATIC S7-200 CPU 226 compact PLC

• Exact order number: 6ES7216-2BD23-0XB0

• Integrated AC power supply

• Supports 120 V AC and 230 V AC supply

• 24 integrated digital DC inputs

• 16 integrated relay outputs

• Up to 24 KB program memory

• 10 KB data memory

• Two integrated RS-485 serial interfaces

• Supports PPI, MPI-related communication, and freeport serial communication

• High-speed counter functionality

• Compatible S7-200 expansion module support

• PROFIBUS DP expansion capability with suitable hardware

• Suitable for industrial logic control and machine automation

• Designed for maintenance and replacement of compatible legacy PLC systems

Technical Specifications

Specifications are based on published Siemens product data. Check the official datasheet for detailed output-current limits, aggregate current limits, wiring requirements, and operating conditions.

Applications

The Siemens S7-200 CPU 226 PLC can be used in compatible industrial systems for:

• Industrial machine and equipment control

• Conveyor and material-handling systems

• Packaging and production machinery

• Pumping and water-control systems

• Manufacturing and assembly automation

• Industrial process sequencing

• Motor and actuator control through suitable interfaces

• Sensor monitoring and digital signal processing

• Control-panel maintenance and repair

• Legacy PLC replacement projects

• Compatible communication and distributed I/O configurations

Compatibility and Installation

Before purchasing, verify that the existing system requires 6ES7216-2BD23-0XB0. This model uses an AC power supply and relay outputs. It should not be confused with CPU 226 variants that use a DC power supply and transistor outputs.

Check the supply voltage, I/O wiring, relay contact ratings, connected loads, expansion modules, communication interfaces, and programming software. Relay outputs do not provide inherent short-circuit protection for connected loads; appropriate external protection is required.

Installation and commissioning should be performed by qualified personnel in accordance with Siemens documentation and applicable electrical safety practices.

Product Availability Note

The Siemens SIMATIC S7-200 CPU 226 is a discontinued legacy product listed as a spare part. Depending on the supplier, available units may be new old stock, used, or refurbished. Confirm the exact order number, product condition, warranty, and return policy before purchasing.