public object ReadItem(string address)
{
lock (this)
{
try
{
if (DbAddress.ContainsKey(address))
{
var addr = DbAddress[address];
var db_id = addr.DBBlockID;
var offset = (short)(addr.Offset - _dbStartAddress[db_id]);
if (addr.Type == "bool")
{
var _buf = _dbAreaBuf[db_id];
var _result_byte = _buf[offset];
var result = (_result_byte & (1 << addr.BitOffset)) != 0;
return(result);
}
if (addr.Type == "int16")
{
var _buf = _dbAreaBuf[db_id];
var _low_byte = _buf[offset];
var _high_byte = _buf[offset + 1];
//Int16 result = (Int16)(_high_byte << 8 + _low_byte);
var result = (short)((_low_byte << 8) + _high_byte);
return(result);
}
if (addr.Type == "int32")
{
var _buf = _dbAreaBuf[db_id];
var _byte1 = _buf[offset];
var _byte2 = _buf[offset + 1];
var _byte3 = _buf[offset + 2];
var _byte4 = _buf[offset + 3];
//Int32 result = (Int32)(_byte4 << 24 + _byte3 << 16 + _byte2 << 8 + _byte1);
var result = (_byte1 << 24) + (_byte2 << 16) + (_byte3 << 8) + _byte4;
return(result);
}
if (addr.Type == "string")
{
var _buf = _dbAreaBuf[db_id];
var result =
Encoding.ASCII.GetString(_buf, offset + 2,
_buf[offset + 1]); //西门子字符串前两位要空出来,读取长度根据第2个字节
return(result);
}
if (addr.Type == "ByteArray") //2020/6/11 ByteArray
{
var _buf = _dbAreaBuf[db_id];
var result = Encoding.ASCII.GetString(_buf, offset, addr.BitOffset);
return(result);
}
throw new Exception("Tag类型不支持");
}
if (_mAddress.ContainsKey(address))
{
var addr = _mAddress[address];
var offset = (short)(addr.Offset - _mAreaMinAddress);
var _buf = _mAreaBuf;
if (addr.Type == "bool")
{
var _result_byte = _buf[offset];
var result = (_result_byte & (1 << addr.BitOffset)) != 0;
return(result);
}
if (addr.Type == "int16")
{
var _low_byte = _buf[offset];
var _high_byte = _buf[offset + 1];
var result = (short)((_low_byte << 8) + _high_byte);
return(result);
}
if (addr.Type == "int32")
{
var _byte1 = _buf[offset];
var _byte2 = _buf[offset + 1];
var _byte3 = _buf[offset + 2];
var _byte4 = _buf[offset + 3];
//Int32 result = (Int32)(_byte4 << 24 + _byte3 << 16 + _byte2 << 8 + _byte1);
var result = (_byte1 << 24) + (_byte2 << 16) + (_byte3 << 8) + _byte4;
return(result);
}
}
else
{
throw new Exception("_dbAddress或_MAddress不包含该地址!");
}
}
catch (Exception ex)
{
//LOG.Error(string.Format("地址{0}读取错:{1}", address, ex));
Log.Error($"Address:{address} readed error,Message:{ex},IP地址时{_plc.IP}");
}
return(null);
}
}
