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問:FUNCTION_BLOCK FB_HOMING
VAR_INPUT
myaxis : posaxis;
starthoming : BOOL;
offset : LREAL;
END_VAR
VAR
myRetDINT : DINT;
mystarthomingrtrig : r_trig;
mystarthoming : BOOL;
myaxishomedrtrig : r_trig;
END_VAR
VAR_OUTPUT
my_axishomed : BOOL;
END_VAR
mystarthomingrtrig(clk := starthoming);
myaxishomedrtrig(clk := my_axishomed);
IF mystarthomingrtrig.q THEN
mystarthoming := TRUE;
ELSIF myaxishomedrtrig.q THEN
mystarthoming := FALSE;
END_IF;
myaxis.setconfigdata.typeofaxis.numberofencoders.
encoder_1.inchomingencoder.proceedshiftpos := offset;
IF mystarthomingrtrig.q AND myaxis.control=ACTIVE THEN
myRetDINT :=
_homing(
axis := myaxis,
homingmode := ACTIVE_HOMING,
homebtype :=DIRECT,
homeb := 0.0,
velocityprofile := TRAPEZOIDAL,
mergemode := IMMEDIATELY,
nextcommand := WHEN_BUFFER_READY,
commandid := _getcommandid()
);
END_IF;
IF myaxis.bingstate.homed = yes THEN
my_axishomed := TRUE;
ELSE
my_axishomed := FALSE;
END_IF;
END_FUNCTION_BLOCK
問題補充:這段程序,前幾段關(guān)于變量的定義基本看的懂,后面就不怎么懂了,myaxis.setconfigdata.typeofaxis.numberofencoders.
encoder_1.inchomingencoder.proceedshiftpos := offset,又是上面意思呢,myRetDINT,是什么意思? 那位幫忙解釋下?
答:這是一段主動回零的程序。
可以參考一下資料
1、程序首先定義了兩個上升沿,當starthoming和axishomed來臨時觸發(fā)兩個上升沿。
2、當上升沿mystarthomingrtrig觸發(fā)后,賦值變量mystarthoming
表示開始回零,當上升沿myaxishomedrtrig觸發(fā),變量復位,回零結(jié)束(這個上升沿后面將觸發(fā))
3、myaxis.setconfigdata.typeofaxis.numberofencoders.
encoder_1.inchomingencoder.proceedshiftpos := offset;
是設定一個偏移量,類型為LREAL,具體變量解釋可以點擊相應的軸看symbol browse,找到這個變量,看它的屬性。
4、前面那個上升沿觸發(fā),并且軸使能后開始回零指令。myRetDINT只是在執(zhí)行回零指令_homing()所要求定義的返回值,在VAR里面也定義了,可以隨便定義名稱的,是一個DINT型,有時可以根據(jù)這個返回值確定程序執(zhí)行的狀態(tài)。
5、當回零完成后,用軸的回零變量置位my_axishomed, 變量my_axishomed同時又觸發(fā)上面的上升沿程序。
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