我在西门子的关于CP441故障诊断手册读到下文时不知如何操作：

Diagnostics with the CP 441
8-5　Point-to-Point Communication CP 441
8.3 Diagnostics Messages of the System Function Blocks
Every system function block has a STATUS parameter for error diagnostics.
The STATUS message numbers always have the same meaning, irrespective of
which system function block is used.
The tables below are copied from the STEP 7 manual and represent only the　current status. Refer to the original tables if you discover discrepancies.
Displaying and Evaluating the STATUS Output
You can display and evaluate the STATUS output of the system function blocks　using the STEP 7 variable table.（如何操作？？？？？？）
For further information on using the variable table, see the STEP 7 manual /3/（哪部手册？？？？？？？？？）.