/// <summary>
/// 读取西门子PLC中该Tag的值
/// </summary>
/// <param name="tag"></param>
/// <returns></returns>
public SiemensTag ReadTagValue(SiemensTag tag)
{
Stopwatch sw = new Stopwatch();
sw.Start();
if (tag is SiemensBoolOfTag)
{
byte[] buffer = new byte[1];
int resNo =
specialRWConnection.ReadBlock(
DBType,
DBNumber,
tag.DB_Offset,
1,
ref buffer,
out string errText);
SetTagValue(buffer, tag, tag.DB_Offset);
}
else if (tag is SiemensLengthTag)
{
if (tag is SiemensRealOfTag)
{
SiemensRealOfTag ltag = tag as SiemensRealOfTag;
float value = 0;
int resNo =
specialRWConnection.ReadFloat(
DBType,
DBNumber,
ltag.DB_Offset,
ref value,
out string errText);
ltag.Value = value;
}
else
{
SiemensLengthTag ltag = tag as SiemensLengthTag;
byte[] buffer = new byte[ltag.Length];
int resNo =
specialRWConnection.ReadBlock(
DBType,
DBNumber,
ltag.DB_Offset,
ltag.Length,
ref buffer,
out string errText);
SetTagValue(buffer, tag, tag.DB_Offset);
}
}
sw.Stop();
_log.Debug($"触发信号[{tag.Name}]的执行时长：[{sw.ElapsedMilliseconds}]毫秒");
return(tag);
}
/// <summary>
/// 设置Tag对象的值
/// </summary>
/// <param name="buffer">从PLC读取数据块中的内容</param>
/// <param name="tag">Tag对象</param>
/// <param name="beginOffset">数据块开始偏移量</param>
private bool SetTagValue(byte[] buffer, CustomTag tag, int beginOffset)
{
int offset = tag.DB_Offset - beginOffset;
if (tag is SiemensBoolOfTag)
{
SiemensBoolOfTag ltag = tag as SiemensBoolOfTag;
bool newValue = Tools.GetBitValue(buffer[offset], ltag.Position);
if (ltag.Value == newValue)
{
return(false);
}
ltag.Value = newValue;
_log.Trace($"[{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);
}
}