Siemens 6ES7211-0BA22-0XB0 S7-200 CPU 221

Efficient Processing Power for Small-Scale Automation

This compact CPU module delivers reliable processing power for small to medium control tasks. It executes user programs with fast scan times for responsive system operation. The Siemens 6ES7211-0BA22-0XB0 features a built-in power supply and I/O points for standalone use. It accommodates up to 4 KB of program memory for straightforward applications. The CPU supports 6 digital inputs and 4 digital outputs for basic control functions. It communicates with programming devices via the built-in RS-485 interface.

Physical Dimensions and Mounting Details

The unit measures 90 mm in height, 80 mm in width, and 62 mm in depth. It weighs approximately 0.30 kg with all connectors and mounting hardware attached. The 6ES7211-0BA22-0XB0 mounts directly onto a standard DIN rail or panel. Its compact housing fits easily into small control enclosures. This space-efficient design suits applications with limited panel space.

Interface Connectivity and Communication Capabilities

A front-facing RS-485 port provides the programming and communication interface. The Siemens 6ES7211-0BA22-0XB0 includes a removable connector for field wiring connections. It features a memory cartridge slot for program backup and transfer. The CPU supports the S7-200 communication protocol for device networking. LED indicators display CPU status, input states, and output conditions clearly.

Internal Architecture and Energy Storage Elements

The PCB contains a microprocessor, memory chips, and power regulation circuits. The 6ES7211-0BA22-0XB0 uses a 100 µF capacitor for transient energy storage. It stores the user program in EEPROM for reliable data retention without battery backup. The CPU includes a built-in real-time clock for time-based functions. An integrated watchdog timer monitors program execution and triggers automatic recovery.

Parameter	Specification
Model	6ES7211-0BA22-0XB0
Type	SIMATIC S7-200 CPU 221
Program Memory	4 KB (EEPROM)
Data Memory	2 KB (RAM)
Digital Inputs	6 (24 V DC)
Digital Outputs	4 (24 V DC, 0.75 A)
Onboard I/O	10 points total
Scan Time	0.8 ms per 1,000 instructions
Communication	RS-485 (PPI protocol)
Memory Cartridge	Optional (for backup)
Supply Voltage	24 V DC ±20%
Dimensions (H×W×D)	90 × 80 × 62 mm
Weight	0.30 kg
Operating Temperature	0 to +55 °C
Storage Temperature	–20 to +70 °C
Energy Storage	100 µF capacitor
Additional Features	RTC, watchdog timer, EEPROM backup

Recommended Installation and Programming Practices

Mount the Siemens 6ES7211-0BA22-0XB0 securely on a DIN rail with the correct orientation. Connect input devices and output loads according to the wiring diagram. Load the user program using the STEP 7-Micro/WIN programming software. Test all I/O functions thoroughly before placing the system into service. Verify the real-time clock setting for accurate time-stamping of events. Schedule routine inspections of the terminal connections and LED status indicators.