/// <summary>
/// 定时发送MES心跳信号线程，目前固定每隔2秒钟发送一次，间隔时间不能修改
/// </summary>
private void MESHeartBeat()
{
while (!threadTerminated)
{
DateTime now = DateTime.Now;
if (cycleReadConnection != null)
{
TimeSpan timeSpan = now - LastMESHearBeatTime;
if (timeSpan.TotalMilliseconds >= 2000)
{
CustomTag tag = FindTag("COMM", "MES_Heart_Beat");
if (tag != null && tag is SiemensBoolOfTag)
{
SiemensBoolOfTag heartBeatTag = tag as SiemensBoolOfTag;
heartBeatTag.Value = !heartBeatTag.Value;
try
{
cycleReadConnection.WriteToPLC(
DBType,
DBNumber,
heartBeatTag);
}
catch (Exception error)
{
_log.Error(error.Message, error);
}
}
LastMESHearBeatTime = now;
}
}
Thread.Sleep(500);
}
}
/// <summary>
/// 设置Tag对象的值
/// </summary>
/// <param name="buffer">从PLC读取数据块中的内容</param>
/// <param name="tag">Tag对象</param>
/// <param name="beginOffset">数据块开始偏移量</param>
private bool SetTagValue(byte[] buffer, CustomTag tag, int beginOffset)
{
int offset = tag.DB_Offset - beginOffset;
if (tag is SiemensBoolOfTag)
{
SiemensBoolOfTag ltag = tag as SiemensBoolOfTag;
bool newValue = Tools.GetBitValue(buffer[offset], ltag.Position);
if (ltag.Value == newValue)
{
return(false);
}
ltag.Value = newValue;
_log.Trace($"[{ltag.Name}={ltag.Value}]");
return(true);
}
else if (tag is SiemensByteOfTag)
{
SiemensByteOfTag ltag = tag as SiemensByteOfTag;
byte newValue = buffer[offset];
if (ltag.Value == newValue)
{
return(false);
}
ltag.Value = newValue;
_log.Trace($"[{ltag.Name}={ltag.Value}]");
return(true);
}
else if (tag is SiemensWordOfTag)
{
SiemensWordOfTag ltag = tag as SiemensWordOfTag;
ushort newValue = Tools.GetWordValue(buffer, offset);
if (ltag.Value == newValue)
{
return(false);
}
ltag.Value = newValue;
_log.Trace($"[{ltag.Name}={ltag.Value}]");
return(true);
}
else if (tag is SiemensIntOfTag)
{
SiemensIntOfTag ltag = tag as SiemensIntOfTag;
short newValue = Tools.GetIntValue(buffer, offset);
if (ltag.Value == newValue)
{
return(false);
}
ltag.Value = newValue;
_log.Trace($"[{ltag.Name}={ltag.Value}]");
return(true);
}
else if (tag is SiemensDWordOfTag)
{
SiemensDWordOfTag ltag = tag as SiemensDWordOfTag;
uint newValue = Tools.GetDWordValue(buffer, offset);
if (ltag.Value == newValue)
{
return(false);
}
ltag.Value = newValue;
_log.Trace($"[{ltag.Name}={ltag.Value}]");
return(true);
}
else if (tag is SiemensRealOfTag)
{
SiemensRealOfTag ltag = tag as SiemensRealOfTag;
float newValue = Tools.GetRealValue(buffer, offset);
if (ltag.Value == newValue)
{
return(false);
}
ltag.Value = newValue;
_log.Trace($"[{ltag.Name}={ltag.Value}]");
return(true);
}
else if (tag is SiemensArrayCharOfTag)
{
SiemensArrayCharOfTag ltag = tag as SiemensArrayCharOfTag;
string newValue = Tools.GetStringValue(buffer, offset, ltag.Length);
if (ltag.Value == newValue)
{
return(false);
}
ltag.Value = newValue;
_log.Trace($"[{ltag.Name}={ltag.Value}]");
return(true);
}
else
{
return(false);
}
}