SIMATIC S7-1200 CM 1241 firmware update V2.0.3 Product Information Description The S7-1200 CM 1241 firmware update V2.0.3 provides general robustness improvement in the operational behavior of the communication module CM 1241. The S7-1200 CM 1241 firmware update V2.0.3: Fixes compatibility issue V1.0 CPUs (both modules) Prevents missing the beginning characters of a response message (CM 1241 RS422/485 module) Prevents port lock-up during a receive buffer overflow condition (both modules) Refer to the SIMATIC S7-1200 System Manual for more information about the S7-1200 product family. Table 1 Communication modules affected by the CM 1241 firmware update V2.0.3 Communication module Description Order number RS232 CM 1241 RS232 6ES7 241-1AH32-0XB0 RS422/485 CM 1241 RS422/485 6ES7 241-1CH32-0XB0 Required user action You can install the firmware update from either the Web server or by making a SIMATIC S7 memory card that contains the firmware update. The S7-1200 System Manual documents both methods. Siemens AG Division Digital Factory Postfach 48 48 90026 NURNBERG CM 1241 firmware update V2.0.3 (c) Siemens AG 2015. All rights reserved A5E33507026-AB, A5E33507026-AB, 01/2015 01/2015 1