你让我无话可说。
下面是我从PRODAVE手册中复制下来的，是目录中关于S7-200的部分，你自己在手册中找说明看吧。
4.3 Functions for Data Communication Traffic to the S7 200..............................4-33
4.3.1 as200_ag_info.................................................................................................4-33
4.3.2 as200_ag_zustand..........................................................................................4-34
4.3.3 as200_eamsmvs_field_read .......................................................................4-34
4.3.4 as200_t_field_read..........................................................................................4-37
4.3.5 as200_z_field_read.........................................................................................4-39
4.3.6 as200_mix_read..............................................................................................4-41
4.3.7 as200_amsmvs_field_write..........................................................................4-44
4.3.8 as200_z_field_write ........................................................................................4-46
4.3.9 as200_mix_write .............................................................................................4-47
4.3.10 as200_mb_setbit.............................................................................................4-50
4.3.11 as200_mb_resetbit..........................................................................................4-51
4.3.12 as200_mb_bittest ............................................................................................4-52