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Siemens S7-200 SR20 PLC - Brief Overview
Product Description
The S7-200 SR20 is a compact, cost-effective micro PLC from Siemens' discontinued S7-200 series, designed for small-scale automation tasks.

Key Features
✅ Integrated I/O:

12 digital inputs (24V DC)

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

✅ Performance:

12 KB program memory

4 high-speed counters (up to 30 kHz)

2 pulse outputs (20 kHz for PWM/PTO)

✅ Communication:

1 × RS-485 port (PPI/MPI protocol)

Supports expansion modules (PROFIBUS, analog I/O)

✅ Power Options:

85–264V AC or 24V DC supply

Typical Applications
Small machines (packaging, conveyors)

Building automation (HVAC, lighting)

Replacement for relay-based control