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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(bǔ)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(dòng)回零的程序。
可以參考一下資料
1、程序首先定義了兩個(gè)上升沿，當(dāng)starthoming和axishomed來臨時(shí)觸發(fā)兩個(gè)上升沿。
2、當(dāng)上升沿mystarthomingrtrig觸發(fā)后，賦值變量mystarthoming
表示開始回零，當(dāng)上升沿myaxishomedrtrig觸發(fā)，變量復(fù)位，回零結(jié)束（這個(gè)上升沿后面將觸發(fā)）
3、myaxis.setconfigdata.typeofaxis.numberofencoders.
encoder_1.inchomingencoder.proceedshiftpos := offset;
是設(shè)定一個(gè)偏移量，類型為LREAL，具體變量解釋可以點(diǎn)擊相應(yīng)的軸看symbol browse，找到這個(gè)變量，看它的屬性。
4、前面那個(gè)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(gè)DINT型，有時(shí)可以根據(jù)這個(gè)返回值確定程序執(zhí)行的狀態(tài)。
5、當(dāng)回零完成后，用軸的回零變量置位my_axishomed， 變量my_axishomed同時(shí)又觸發(fā)上面的上升沿程序。
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