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Discrete and Process Automation

Teardown: Siemens SIMATIC S7-200CN (CPU 226) PLC

02 June 2014
The following is an overview of a teardown analysis conducted by IHS Technology Teardown Services.

The S7-200CN is the “mainframe” for Siemens’s line of micro-programmable logic controllers (Micro PLCs) for controlling a variety of automation applications. The system is modular and can be fitted with any of five CPUs, from simple to high-performance, each suited to different levels of system and process complexity. Programming is done via a Windows-based tool.

The CN version was developed specifically for the China market, although the S7-200 PLC has been a mainstay in that market since its introduction there in 1994. The S7-200 product line has been repeatedly redesigned since its introduction to be smaller, faster, and to have increased functionality. The new S7-200 products are drop-in replacements for previous versions.

Summary points:

  • Version of the S7-200 for the China market
  • Program memory: Up to 24576 Bytes
  • Data memory: 10240 Bytes
  • Local I/O: 24 In/16 Out
  • Up to 7 expansion modules; RS-485 port

Target market: Factory automation

Pricing: N/A

Availability: China

Total cost (direct materials and manufacturing): $40.91

Major Components:

- MCU – MFG: TEXAS INSTRUMENTS INC – MPN: F741583APGF – (Qty: 1)

- SRAM, 1 Mb, 3 V, 55 ns – MFG: AMIC TECHNOLOGY CORP – MPN: LP62S1024BX-55LLIF – (Qty: 2)

- Optocoupler – MFG: AVAGO TECHNOLOGIES INC – MPN: ACPL-204V – (Qty: 24)

- Off-line Switcher, 85 W (@230 VAC Input) – MFG: POWER INTEGRATIONS INC – MPN: TOP247FN – (Qty:1)

- Relay, 1 Form A, 24 VDC, 5 A, (30 VDC/250 VAC) – MFG: FUJITSU COMPONENT LTD – MPN: FTR-MYAA024E – (Qty: 16)

- Terminal Block, Screw-type, 12-position, Pluggable, w/ Black Injection-molded Plastic Housing – MFG: MOLEX INC – (Qty: 2)

- Terminal Block, Screw-type, 12-position, Pluggable, w/ Black Injection-molded Plastic Housing – MFG: MOLEX INC – (Qty: 2)

- 4-layer, FR4, Lead-free – MFG: RED BOARD CO LTD – (Qty: 1)

- 4-layer, FR4, Lead-free – MFG: RED BOARD CO LTD – (Qty: 1)

- 2-layer, FR4, Lead-free – MFG: RED BOARD CO LTD – (Qty: 1)

S7-200CN Enclosure & Contents

Source: IHS

Main PCB (top)

Source: IHS

Main PCB (bottom)

Source: IHS

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