SIWAREX WP321
Manual, 07/2014, A5E33715669A-02
95
Communication in SIMATIC S7-300/1200/1500
A SIWAREX WP321 occupies 16 bytes each in the I/O areas of the CPU. Communication
between SIWAREX and SIMATIC CPU is supported by the FB.
Table 11- 1 Memory requirements of the function block
YES
YES
YES
Main memory requirements in CPU
11 600 byte + n x 1 232 byte
Load memory requirements in CPU
138 788 byte + n x 28 470 byte
n = number of WP321 modules
The function block described above including HMI configuring can be downloaded as a
predefined example project ("Ready-for-use") from the Siemens Customer Support.
Structure of the program "Ready for use"
There is one program for Step 7 Classic and another for TIA Portal. The two programs each
consist of two parts:
● STEP 7 software for the SIMATIC CPU
● WinCC project (integrated in SIMATIC Manager)
All messages are saved as bit information. The message system can thus directly access
the bit fields and display the message texts.