Siemens 6ES7216-2BD21-0XB0 CPU 226

The Siemens 6ES7216-2BD21-0XB0 CPU 226 functions as a high-capacity compact unit for SIMATIC S7-200 micro PLC systems. This integrated controller combines a powerful processor, power supply, and extensive I/O in a single housing. The unit manages demanding small to medium automation applications with efficient performance.

Technical Specifications

Parameter	Specification
Product Type	Compact CPU unit
Model	CPU 226 (Relay outputs)
Program Memory	16 KB (integrated)
Data Memory	10 KB (integrated)
Digital Inputs	24 x 24V DC (sink/source)
Digital Outputs	16 x 24V DC / 2A (relay)
Total I/O Points	40 I/O (24 IN / 16 OUT)
Expandable I/O	Up to 7 expansion modules
Communication Ports	2 x RS-485 (PPI, MPI, freeport)
Built-in Features	2 x potentiometers, real-time clock
Processing Time (bit)	0.37 µs (typical)
Dimensions (W x H x D)	196 x 80 x 62 mm
Weight	0.6 kg
Internal Components	1 x CPU core, 16 x relays, 1 x power supply, 2 x UARTs
Energy Storage	SuperCap + battery (100h backup)
Power Supply	24V DC (20.4V – 28.8V)
Power Consumption	20W (typical)
Operating Temperature	0°C to +55°C
Storage Temperature	-40°C to +85°C
Protection Class	IP20
Mounting	DIN rail or panel
Approvals	CE, UL, CSA

Extensive Integrated I/O for Versatile Control

The Siemens 6ES7216-2BD21-0XB0 includes 24 digital inputs and 16 relay outputs onboard. This extensive I/O reduces external module requirements for many applications. The 24V DC inputs accept signals from sensors, pushbuttons, and switches. The relay outputs switch 2A loads for direct actuator and contactor control.

Relay Outputs for AC and DC Load Switching

This CPU features 16 relay outputs rated at 24V DC and 2A per contact. These relays handle both AC and DC loads with complete electrical isolation. The outputs provide reliable switching for inductive and resistive loads. Users can connect motors, solenoids, and indicator lamps directly.

High-Speed Processing for Complex Logic

The CPU executes bit operations in 0.37 µs for responsive control execution. This speed handles complex mathematical functions and data handling efficiently. The processor manages both discrete and analog control strategies effectively. Users can implement time-critical applications without performance degradation.

Dual Communication Ports for Networking

Two RS-485 ports support PPI, MPI, and freeport protocols for flexible connectivity. These ports connect to HMIs, drives, and other PLCs simultaneously. Users can program through either port using STEP 7 Micro/WIN. The ports support multi-drop networking for distributed system architectures.

Expandable Architecture with Up to 7 Modules

The CPU 226 accommodates up to 7 expansion modules for system growth. This capacity provides flexibility for evolving application requirements. Users can add analog modules, communication modules, or additional I/O. The expansion bus connects easily through the side-mounted interface.

Built-In Analog Adjustments and Real-Time Clock

Two onboard potentiometers provide analog setpoint adjustments without external devices. The integrated real-time clock enables time-stamped events and scheduled operations. A SuperCap with battery backup maintains the clock for 100 hours without power. Users can schedule maintenance and production based on real-time data.