package cn.stylefeng.guns.plcserver.server.OP170.callback;
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import cn.stylefeng.guns.plcserver.opc.GlobalVariable;
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import cn.stylefeng.guns.plcserver.opc.OPCComm;
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import cn.stylefeng.guns.plcserver.opc.unit.OPCUnit;
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import org.jinterop.dcom.common.JIException;
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import org.jinterop.dcom.core.JIVariant;
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import org.openscada.opc.lib.da.DataCallback;
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import org.openscada.opc.lib.da.Item;
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import org.openscada.opc.lib.da.ItemState;
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public class DataCallBack_OP170_F_HEART_BEAT implements DataCallback {
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private OPCComm opc = OPCComm.getInstance();
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private int count = 0;
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@Override
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public void changed(Item item, ItemState itemState) {
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// 读取心跳变量的值
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try {
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if (itemState.getValue().getType() == JIVariant.VT_BOOL) {
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boolean value = itemState.getValue().getObjectAsBoolean();
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setHeartbeat(value);
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}
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} catch (JIException e) {
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e.printStackTrace();
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}
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}
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/**
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* 设置心跳标志位,保存到全局变量
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*/
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public void setHeartbeat(boolean value) {
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if (!value) {
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OPCUnit.write(opc.getOP170_F_HEART_BEAT(), "true");
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GlobalVariable.OP170_F_HEART_BEAT = true;
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count = 0;
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} else {
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count++;
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}
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// 循环读取频率是:500ms一次,如果超过6次,也就是3s认定超时
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if (count > GlobalVariable.HEART_MAX_COUNT) {
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GlobalVariable.OP170_F_HEART_BEAT = false;
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}
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}
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}
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