Siemens S7-200 SR20 PLC Technical Specifications
General Information
Model: CPU SR20 (6ES7 212-1AG40-0XB0)

Type: Compact Micro PLC

Memory:

Program Memory: 12 KB

Data Memory: 8 KB

I/O Capacity:

Digital Inputs: 12 (24V DC, sink/source)

Digital Outputs: 8 (relay outputs: 2A @ 230V AC/30V DC)

Analog Potentiometer: 1 (8-bit resolution)

Communication Ports
Integrated Ports:

1 × RS-485 (PPI/MPI protocol, supports freeport communication)

Optional expansion for EM277 PROFIBUS-DP module

High-Speed Counters (HSC)
Total: 4 HSCs

Single-phase: 4 counters (30 kHz max)

Dual-phase: 2 counters (20 kHz max)

Pulse Output
2 × Pulse Outputs (up to 20 kHz) for PWM or PTO (Pulse Train Output)

Timers & Counters
Timers: 256 (TON, TOF, TONR)

Counters: 256 (CTU, CTD, CTUD)

Power Supply
Input Voltage: 85–264V AC (47–63 Hz) or 24V DC

Power Consumption: ~10W (typical)

Expansion Capability
Supports up to 7 expansion modules (digital, analog, communication)

Certifications & Compliance
CE, UL, cULus

Standards: IEC 61131-2, EN 61131-2

Dimensions & Weight
Dimensions (W × H × D): 90 × 80 × 62 mm

Weight: ~360 g

Typical Applications
✔ Small automation tasks (conveyors, packaging)
✔ HVAC control systems
✔ Simple machine control