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Entry type: FAQ Entry ID: 109752686, Entry date: 03/20/2019
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Why is the error "294:xx" shown when you download a program with encrypted Modbus block?

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  • Associated product(s)
In the current versions the Modbus blocks are encrypted with S7 Block Privacy.

Table 1 shows which Modbus blocks are encrypted with S7 Block Privacy.
 

ProductArticle number Modbus block
SIMATIC Modbus/TCP CP6AV6676-6MB00-6AX0
6AV6676-6MB00-6AD0
FB905
SIMATIC Modbus/TCP PN-CPU6AV6676-6MB20-3AX0
6AV6676-6MB20-3AD0
FB900
SIMATIC Modbus/TCP CP Red6AV6676-6MB30-3AX0
6AV6676-6MB30-3AD0
 
FB909, FB907

Table 1

S7-400 CPUs, S7-300 CPUs and ET 200S CPUs with older firmware versions cannot edit function blocks encrypted with S7 Block Privacy and reports an error at download. Error "294:6" or "294:23" occurs.
 


Fig. 1

This concerns the following firmware versions of the S7-400 CPUs, S7-300 CPUs and ET 200S CPUs.


ProductVersion 
S7-400 CPUs< V6.0
S7-300 CPUs< V3.2
ET 200S CPUs< V3.2

 Table 2

Remedy

  • Update the CPUs to the required firmware version.
  • If there is no corresponding firmware update available for the CPU, you have to replace the CPU.
  • With WinAC or older CPUs you can use the block library of SIMATIC Modbus/TCP PN CPU (article number: 2XV9450-1MB02) or SIMATIC Modbus/TCP CP (article number: 2XV9450-1MB00).

Download SIMATIC Modbus/TCP PN-CPU (2XV9450-1MB02)
The download includes the project "SIMATIC_ModbusTCP_PN_CPU_DEMO.zip".
Unpack the data in the "SIMATIC_ModbusTCP_PN_CPU_DEMO.zip" file in a separate directory. Then you can use STEP 7 to open and edit the project.

 Registration required  SIMATIC_ModbusTCP_PN_CPU_DEMO.zip (4.7 MB)

Download SIMATIC Modbus/TCP CP (2XV9450-1MB00)
The download includes the project "SIMATIC_ModbusTCP_CP_DEMO.zip".
Unpack the data in the "SIMATIC_ModbusTCP_CP_DEMO.zip" file in a separate directory. Then you can use STEP 7 to open and edit the project.

 Registration required  SIMATIC_ModbusTCP_CP_DEMO.zip (6.2 MB)

Download SIMATIC Modbus/TCP CP Red (2AV6676-6MB30-3AX0)
The download includes the project "SIMATIC_ModbusTCP_CP_Redundant_DEMO.zip". 
Unpack the data in the  "SIMATIC_ModbusTCP_CP_Redundant_DEMO.zip" file in a separate directory. Then you can use STEP 7 to open and edit the project.

 Registrierung notwendig  SIMATIC_ModbusTCP_CP_Redundant_DEMO.zip (7,0 MB)

Security information
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http://www.siemens.com/industrialsecurity.