Siemens SIMATIC S7-200 SMART CPU SR20

Series#: Siemens

Product Details

SIMATIC S7-200 SMART CPU SR20; order number 6ES7288-1SR20-0AA1.
12 integrated 24 V DC digital inputs and eight integrated relay outputs.
120/240 V AC mains supply; relay outputs are for switched loads rather than transistor pulse trains.
12 KB program memory, 8 KB data memory and 10 KB retentive memory.
One onboard Ethernet interface and one RS485 interface for engineering and communications.
Expandable with up to six signal modules and one signal board, subject to the system configuration.
Program with STEP 7 Micro/WIN SMART; confirm firmware and expansion-module compatibility before replacement.

WhatsApp Inquiry

Specification

Datasheet (PDF)

Overview

The SR20 is the AC-powered, relay-output CPU in the S7-200 SMART family. Its 12 inputs and eight relay outputs suit compact machine control where a mix of output load types is needed.

Technical specifications

Specification	Value
Product family	SIMATIC S7-200 SMART
CPU / order number	SR20 / 6ES7288-1SR20-0AA1
Supply	120/240 V AC; permissible 85–264 V AC, 47–63 Hz
Integrated digital inputs	12, 24 V DC
Integrated digital outputs	8 relay outputs
Program memory	12 KB
Data memory	8 KB
Retentive memory	10 KB
Ethernet interfaces	1 integrated
Serial interfaces	1 integrated RS485
Signal module expansion	Up to 6 modules
Signal board slots	1
High-speed counters	6
Housing dimensions	90 × 100 × 81 mm
Engineering software	STEP 7 Micro/WIN SMART

Integration and replacement notes

Use the relay-output SR20 when the installed wiring and load characteristics match its relay contacts. Do not substitute a transistor-output ST CPU solely because its I/O count is similar. Check input commons, output group ratings, expansion-module support and program transfer procedure against the existing installation.