SIMATIC S7-1200 Communication Modules include the CM 1241 for RS422/485 and RS-232 with Freeport, the CM 1242-5 for connecting the S7-1200 to PROFIBUS as a DP slave, and the CM 1243-2. The CM 1241 handles point-to-point serial communication with ASCII, USS, Modbus RTU and 3964(R), parameterized in STEP 7 Basic.
Technical data
| Product | CM / CP / CSM |
|---|---|
| Product family | SIMATIC S7-1200 |
| Description | Serial, PROFIBUS, AS-Interface, Ethernet, LTE and telecontrol communication modules |
| Example version | CM 1241 communications module SIMATIC S7-1200, CM 1241 communications module, RS422/485 9-pin D-sub (socket) supports Freeport |
| Programming | STEP 7 (TIA Portal) |
Article numbers
| Version | Description | Article No. |
|---|---|---|
| Standard | CM 1241 communications module SIMATIC S7-1200, CM 1241 communications module, RS422/485 9-pin D-sub (socket) supports Freeport | 6ES7241-1CH32-0XB0 |
| Standard | SIMATIC S7-1200, CM 1241 communications module, RS-232 9-pin D-sub (pin), supports Freeport | 6ES7241-1AH32-0XB0 |
| Standard | CM 1242-5 communications module Communications module for electrical connection of SIMATIC S7-1200 to PROFIBUS as a DP slave module | 6GK7242-5DX30-0XE0 |
| Standard | PROFIBUS FastConnect RS485 connection plug With 90° cable outlet; with insulation displacement terminals, max. transfer rate 12 Mbps • Without programming device interface | 6ES7972-0BA52-0XA0 |
| Standard | • With programming device interface | 6ES7972-0BB52-0XA0 |
| Standard | CM 1243‑2 communications module | 3RK7243-2AA30-0XB0 |
| Standard | • AS-Interface master for SIMATIC S7‑1200 • Corresponds to AS‑Interface specification V3.0 • With screw terminals, removable terminals (included in the scope of supply) • Dimensions (W x H x D) mm: 30 x 100 x 75 Note: The CM 1243‑2 communications module is available as a SIPLUS version under Article No. 6AG1243‑2AA30‑7XB0 in the extended temperature range (from -25 to +70 °C) and for use in harsh environmental conditions (coated according to environment standard IEC 60721). For more information, see www.siemens.com/siplus-extreme. DCM 1271 data decoupling module | 3RK7271-1AA30-0AA0 |
| Standard | CM 1243-5 communications module Communications module for electrical connection of SIMATIC S7-1200 to PROFIBUS as a DPV1 master | 6GK7243-5DX30-0XE0 |
| Standard | CSM 1277 compact switch module Unmanaged switch for the connection of a SIMATIC S7-1200 and as many as three other nodes to an Industrial Ethernet operating at 10/100 Mbps; 4 x RJ45 ports; external 24 V DC power supply, LED diagnostics, S7-1200 module including electronic equipment manual on CD-ROM | 6GK7277-1AA10-0AA0 |
| Standard | CSM 1277 G2 compact switch module Compact switch module for SIMATIC S7-1200 G2 and up to 3 other nodes in Industrial Ethernet with 10/100 Mbps; Unmanaged switch, 4 RJ45 ports, ext. 24 V DC power supply LED diagnostics, S7-1200 module including equipment manual available for download | 6GK7277-1AA50-0AA0 |
| SIPLUS | SIPLUS NET CSM 1277 compact switch module | 6AG1277-1AA10-4AA0 |
| Standard | Unmanaged switch for the connection of a SIPLUS S7-1200 and as many as three other nodes to an Industrial Ethernet operating at 10/100 Mbps 4 x RJ45 ports; external 24 V DC power supply, LED diagnostics, S7-1200 module including electronic equipment manual on CD-ROM IE FC TP trailing cable 2 x 2 (type C) 6XV1840-3AH10 4-core, shielded TP installation cable for connection to IE FC RJ45 outlet/IE FC RJ45 plug 180/90 for use in cable carriers; PROFINET-compatible; with UL approval; sold by the meter; max. delivery unit 1000 m, minimum order quantity 20 m IE FC RJ45 plug 180 2 x 2 RJ45 plug-in connector for Industrial Ethernet with a rugged metal enclosure and integrated insulation displacement contacts for connecting Industrial Ethernet FC installation cables; 180° cable outlet; for network components and CPs/CPUs with Industrial Ethernet interface • 1 pack = 1 unit | 6GK1901-1BB10-2AA0 |
| Standard | • 1 pack = 10 units | 6GK1901-1BB10-2AB0 |
| Standard | • 1 pack = 50 units | 6GK1901-1BB10-2AE0 |
| Standard | IE FC RJ45 outlet | 6GK1901-1FC00-0AA0 |
| Standard | CP 1243-1 communications processor CP 1243-1 communications processor for connecting SIMATIC S7-1200 as an additional Ethernet interface and for connection to control centers via telecontrol protocols (DNP3, IEC 60870, TeleControl Basic), security (firewall, VPN) | 6GK7243-1BX30-0XE0 |
| Standard | CP 1243-7 LTE communications processor Communications processor for connecting SIMATIC S7-1200 to TeleControl Server Basic via LTE mobile wireless network • CP 1243-7 LTE EU Frequencies in European band: 700, 1700 MHz | 6GK7243-7KX30-0XE0 |
| Standard | • CP 1243-7 LTE US Frequencies in North American band: 800, 1800, 2600 MHz | 6GK7243-7SX30-0XE0 |
| Standard | CP 1243-8 IRC communications processor | 6GK7243-8RX30-0XE0 |
| Standard | Communications processor for connecting a SIMATIC S7-1200 via the SINAUT ST7 telecontrol protocol to higher- level ST7 stations or to an ST7 control center, or a DNP3 or IEC-capable control center via corresponding DNP3 or IEC 60870-5-104 open telecontrol protocols SINAUT engineering software V5.5 + SP3 | 6NH7997-0CA55-0AA0 |
| Standard | On CD, consisting of: • SINAUT ST7/DNP3 configuration and diagnostic software for STEP 7 V5.6 • SINAUT TD7 block library • Electronic manual in German and English SINAUT engineering software V5.5; Upgrade from V5.0, V5.1, V5.2, V5.3 or V5.4 | 6NH7997-0CA55-0GA0 |
| Standard | TeleService modules Connection to TS Adapter IE Basic/Advanced or CP 1243-8 IRC. Power supply via TS Adapter IE Basic/Advanced or CP 1243-8 IRC TS module RS232 | 6ES7972-0MS00-0XA0 |
| Standard | TS module MODEM | 6ES7972-0MM00-0XA0 |
| SIPLUS | SIPLUS CM 1241 communications module (Extended temperature range and exposure to environmental substances) Ambient temperature -40 ... +70° C Communications module for point-to-point connection, with one RS232 interface | 6AG1241-1AH32-2XB0 |
| SIPLUS | Communications module for point-to-point connection, with one RS 485 interface | 6AG1241-1CH32-2XB0 |
| SIPLUS | For areas with extreme exposure to environmental substances (conformal coating) Communications module for point-to-point connection, with one RS232 interface | 6AG1241-1AH32-4XB0 |
| SIPLUS | Communications module for point-to-point connection, with one RS 485 interface | 6AG1241-1CH32-4XB0 |
| SIPLUS | SIPLUS CM 1242-5 communications module (Extended temperature range and exposure to environmental substances) Communications module for electrical connection of SIMATIC S7-1200 to PROFIBUS as a DPV1 slave | 6AG1242-5DX30-2XE0 |
| SIPLUS | SIPLUS CM 1243‑2 communications module | 6AG1243-2AA30-7XB0 |
| SIPLUS | SIPLUS CM 1243-5 communications module (Extended temperature range and exposure to environmental substances) Communications module for electrical connection of SIMATIC S7-1200 to PROFIBUS as a DPV1 master | 6AG1243-5DX30-2XE0 |
| SIPLUS | SIPLUS CP 1243-1 communications module (Extended temperature range and exposure to environmental substances) Communications processor for connecting SIMATIC S7-1200 as an additional Ethernet interface and for connection to control centers via telecontrol protocols (DNP3, IEC 60870, TeleControl Basic), security (firewall, VPN) | 6AG1243-1BX30-2AX0 |
| SIPLUS | SIPLUS NET CSM 1277 compact switch module (Extended temperature range and exposure to environmental substances) Unmanaged switch for the connection of a SIPLUS S7-1200 Controller and as many as three other nodes to an Industrial Ethernet operating at 10/100 Mbps; With conformal coating, -40 ....+70 °C, | 6AG1277-1AA10-2AA0 |
Technical data and article numbers are based on Siemens catalog ST 70 · 2026 (chapter SIMATIC S7-1200) and are for information only. Image is representative.
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