西门子S7-200和MM440变频器通讯错误了，程序如下：
LD SM0.0
CALL USS_INIT_P1:SBR4, 1, 9600, 16#1, Q0.0, VB10

LD SM0.0
= L60.0
LD M0.0
= L63.7
LD M0.1
= L63.6
LD M0.2
= L63.5
LD M0.3
= L63.4
LD M0.4
= L63.3
LD L60.0
CALL USS_CTRL_P1:SBR5, L63.7, L63.6, L63.5, L63.4, L63.3, 1, 1, VD100, M1.3, VB20, VW10, VD6, Q0.1, Q0.2, Q0.3, Q0.4

LD SM0.0
= L60.0
LD SM0.5
EU
= L63.7
LD L60.0
CALL USS_RPM_R_P1:SBR8, L63.7, 1, 2240, 0, &VB20, M1.3, VB20, VD2

LD SM0.0
= L60.0
LD M0.5
= L63.7
LD SM0.0
= L63.6
LD L60.0
CALL USS_WPM_R_P1:SBR10, L63.7, L63.6, 1, 2240, 0, VD1000, &VB40, M1.3, VB10

变频器设置如下：P700=5，P1000=5，P2009=1,P2010=6，P2011=1
用电脑监控，USS CTRL P1 程序块内RESP_R=2#0,Error=19,USS_RPM_R_P1程序块内DB_Ptr=16#08000014, USS_WPM_R程序块内DB_Ptr=16#08000028，请问老师和各位大侠，这个是什么原因呢，或者说具体程序怎么来写呢？？