• Siemens SIMATIC S7-1200 AS-Interface master CM 1243-2 & DCM 1271
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Siemens SIMATIC S7-1200 AS-Interface master CM 1243-2 & DCM 1271

Siemens SIMATIC S7-1200 AS-Interface master CM 1243-2 & DCM 1271

AS-Interface master module for SIMATIC S7-1200 with data decoupling module and accessories.

Key features

  • AS-i master to AS-Interface specification V3.0
  • Up to 496 DI / 496 DQ on AS-Interface per CM
  • DCM 1271 data decoupling module, max. 1 x 4 A
  • Removable screw terminals included
  • AS-Interface addressing unit V3.0

Specifications

Brand Siemens
Product line SIMATIC
Series SIMATIC S7-1200
Network AS-Interface V3.0
Max. I/O per CM 496 DI / 496 DQ
Dimensions (WxHxD) 30 x 100 x 75 mm
Engineering STEP 7 (TIA Portal)
Source Siemens Catalog ST 70 · 2026, p. 297-299
3RK7243-2AA30-0XB0 Item: CM 1243-2 communications module | Detail: AS-i master, 30 x 100 x 75 mm
3RK7271-1AA30-0AA0 Item: DCM 1271 data decoupling module | Detail: Max. 1 x 4 A
3RK1901-3MA00 Item: Screw terminals (spare part) | Detail: 5-pole, for CM 1243-2 and DCM 1271
3RK1901-3MB00 Item: Screw terminals (spare part) | Detail: 3-pole, DCM 1271 power supply
3RK1904-2AB02 Item: AS-Interface addressing unit V3.0 | Detail: With addressing cable, IP40
PLC Communication ModulesSiemens
5 product codes available in this family
Sourced direct from KoreaExport-ready supplyCompetitive pricing
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Siemens SIMATIC S7-1200 AS-Interface master CM 1243-2 & DCM 1271

Brand Siemens·PLC Communication Modules

Available part numbers (5)

3RK7243-2AA30-0XB0, 3RK7271-1AA30-0AA0, 3RK1901-3MA00, 3RK1901-3MB00, 3RK1904-2AB02

How to order

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Product codes & specifications
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Product codeSpec
3RK7243-2AA30-0XB0Item: CM 1243-2 communications module | Detail: AS-i master, 30 x 100 x 75 mm
3RK7271-1AA30-0AA0Item: DCM 1271 data decoupling module | Detail: Max. 1 x 4 A
3RK1901-3MA00Item: Screw terminals (spare part) | Detail: 5-pole, for CM 1243-2 and DCM 1271
3RK1901-3MB00Item: Screw terminals (spare part) | Detail: 3-pole, DCM 1271 power supply
3RK1904-2AB02Item: AS-Interface addressing unit V3.0 | Detail: With addressing cable, IP40

Need a different model, or a part not listed here? Send us your parts list →

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