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SIEMENS PLC S7-200 SR20 Smart CPU 6ES7288-1SR20-0AA1 Module

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SIEMENS PLC S7-200 SR20 Smart CPU 6ES7288-1SR20-0AA1

Technical Specifications

Specification	Details	Supplementary Details
Dimensions (W x H x D, mm)	90 x 100 x 81
Weight	367.3 g	320 g
Power Consumption	14 W	12 W
Available Current (24 V DC)	Maximum 300 mA (Sensor Power Supply)
Digital Input Current Consumption (24 V DC)	4 mA per used input point

CPU Features

User Memory	12 KB Program Memory / 8 KB Data Memory / Max 10 KB Retentive Memory
Board Digital I/O	12 Input Points / 8 Output Points
Process Image Size	256 Input (I) / 256 Output (Q)
Analog Image	56 Words of Input (AI) / 56 Words of Output (AQ)
Bit Memory (M)	256 Bits
Temporary (Local) Memory	64 Bytes in Main Program, 64 Bytes in Each Subroutine and Interrupt Program

Expansion Capabilities

I/O Module Expansion	Up to 6 Expansion Modules
Signal Board Expansion	Up to 1 Signal Board

High-Speed Processing

High-Speed Counter: Total 6 units:
- Single-phase: 4 x 200 KHz + 2 x 30 KHz
- Quadrature: 2 x 100 KHz + 2 x 20 KHz
Pulse Output: 2 x 100 KHz
Pulse Capture Input: 12

Interrupt Capabilities

Cycle Interrupt	2 units, 1 ms resolution
Edge Interrupt	4 Rising Edges and 4 Falling Edges (6 each when using optional signal boards)

Memory & Clock

Memory Card	Micro SDHC Card (Optional)
Real-Time Clock Accuracy	±120 Seconds per Month
Real-Time Clock Retention Time	Typically 7 Days, Minimum 6 Days at 25 °C (Maintenance-Free Supercapacitor)

Performance Metrics

Boolean Operations	0.15 μs per instruction
Word Move	1.2 μs per instruction
Real Mathematical Operations	3.6 μs per instruction

Program Organization

POU (Program Organization Unit):
- Main Program: 1
- Subroutines: 128 (0 to 127)
- Interrupt Programs: 128 (0 to 127)
Nesting Depth:
- From Main Program: 8 Subroutine Levels
- From Interrupt Program: 4 Subroutine Levels
Accumulators: 4 units

Timers & Counters

Timers	Non-Retentive (TON, TOF): 192 units Retentive (TONR): 64 units
Counters	256 units

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SIEMENS PLC S7-200 SR20

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