Siemens Simatic S7-300 CP 341 User Manual page 129

Permissible versions of the FBs and FCs
Note the following regarding permissible function blocks and functions:
WARNING
For the CP 341, you can use only the FC 5 V24_STAT and FC 6 V24_SET functions with
version ≥ 2.0. Use of Version 1.0 can result in data corruption. For data transmission with
the CP 341, only the FB 7 P_RCV_RK and FB 8 P_SND_RK function blocks can be used.
The FB 2 P_RCV and FB 3 P_SEND function blocks of the CP 341 must not be used
because this can result in data corruption.
CP 341 Point-to-Point Communication, Installation and Parameter Assignment
Manual, 09/2008, A5E02191071-01
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Communication via Function Blocks
6.1 Overview of the Function Blocks
129