这是一个siemens变频器部分控制,可以参考一下

[COLOR=red]
ORGANIZATION_BLOCK MAIN:OB1
TITLE=I0.0---用户去PPI/自由口通信协议
// I0.1---用来停止电机运转
// I0.2---电机半速运行(正转)
// I0.3---电机全速运行(正转)
// I0.4---电机半速运行(反转)
// I0.5---电机全速运行(反转)
VAR
flag:BYTE;
END_VAR
BEGIN
Network 1 // 网络标题
// 网络注释
LD SM0.1
S S0.0, 1
LSCR S0.0
LD I0.0
CALL SBR_1:SBR1, 1, 19200, VB200
S Q0.0, 1
SCRT S0.1
SCRE
LSCR S0.1
LDN I0.0
CALL SBR_1:SBR1, 0, 19200, VB200
R Q0.0, 1
SCRT S0.0
LD I0.1
EU
MOVB 0, LB0
CALL SBR_0:SBR0, LB0
LD I0.2
EU
MOVB 1, LB0
CALL SBR_0:SBR0, LB0
LD I0.3
EU
MOVB 2, LB0
CALL SBR_0:SBR0, LB0
LD I0.4
EU
MOVB 3, LB0
CALL SBR_0:SBR0, LB0
LD I0.5
EU
MOVB 4, LB0
CALL SBR_0:SBR0, LB0
SCRE
END_ORGANIZATION_BLOCK
SUBROUTINE_BLOCK SBR_0:SBR0
TITLE=子例行程序注释
VAR_INPUT
flag:BYTE;
END_VAR
VAR
cmd:DWORD;
END_VAR
BEGIN
Network 1 // 网络标题
// 网络注释
LDB= LB0, 0
MOVD 16#0C7E0000, LD1
LDB= LB0, 2
MOVD 16#0C7F2000, LD1
LDB= LB0, 3
MOVD 16#147F2000, LD1
LDB= LB0, 4
MOVD 16#147F4000, LD1
LD SM0.0
MOVD 16#0E020C00, LD20
MOVB 16#00, LB23
FILL +0, LW24, 3
MOVD LD1, LD30
MOVB 2, LB34
XORB LB22, LB34
XORB LB23, LB34
XORB LB24, LB34
XORB LB25, LB34
XORB LB25, LB34
XORB LB26, LB34
XORB LB27, LB34
XORB LB28, LB34
XORB LB29, LB34
XORB LB30, LB34
XORB LB31, LB34
XORB LB32, LB34
XORB LB33, LB34
BMB LB20, VB300, 15
XMT VB300, 0

END_SUBROUTINE_BLOCK
SUBROUTINE_BLOCK SBR_1:SBR1
TITLE=子例行程序注释
VAR_INPUT
init:BYTE;
baud:WORD;
err:BYTE;
END_VAR
BEGIN
Network 1

LDW= LW1, +1200
MOVB 16#55, SMB30
LDW= LW1, +2400
MOVB 16#55, SMB30
LDW= LW1, +4800
MOVB 16#4D, SMB30
LDW= LW1, +19200
MOVB 16#45, SMB30
LDB= SMB30, 0
MOVB 16#49, SMB30
LDB= LB0, 0
MOVB 0, SMB30
DTCH 9
DTCH 23
MOVB 0, LB3
CRET

END_SUBROUTINE_BLOCK
[/COLOR]