public static S7WriteJobDatagram BuildWrite(SiemensPlcProtocolContext context, int id, IEnumerable <WriteItem> vars)
{
var numberOfItems = 0;
var result = new S7WriteJobDatagram();
result.Header.ProtocolDataUnitReference = (ushort)id;
if (vars != null)
{
foreach (var item in vars)
{
numberOfItems++;
result.Items.Add(new S7AddressItemSpecificationDatagram
{
TransportSize = S7AddressItemSpecificationDatagram.GetTransportSize(item.Area, item.VarType),
ItemSpecLength = item.NumberOfItems,
DbNumber = item.DbNumber,
Area = (byte)item.Area,
Address = S7AddressItemSpecificationDatagram.GetAddress(item.Offset, item.VarType)
});
}
foreach (var item in vars)
{
numberOfItems--;
result.Data.Add(new S7DataItemSpecification
{
ReturnCode = 0x00,
TransportSize = S7DataItemSpecification.GetTransportSize(item.Area, item.VarType),
Length = item.NumberOfItems,
Data = item.Data,
FillByte = numberOfItems == 0 || item.NumberOfItems % 2 == 0 ? Array.Empty <byte>() : new byte[1],
ElementSize = item.ElementSize
});
}
}
result.Header.ParamLength = (ushort)(2 + result.Items.Count * 12);
result.Header.DataLength = (ushort)(S7DataItemSpecification.GetDataLength(vars) + result.Items.Count * 4);
result.ItemCount = (byte)result.Items.Count;
return(result);
}
public static S7ReadJobDatagram BuildRead(SiemensPlcProtocolContext context, int id, IEnumerable <ReadItem> vars)
{
var result = new S7ReadJobDatagram();
result.Header.ProtocolDataUnitReference = (ushort)id;
if (vars != null)
{
foreach (var item in vars)
{
result.Items.Add(new S7AddressItemSpecificationDatagram
{
TransportSize = S7AddressItemSpecificationDatagram.GetTransportSize(item.Area, item.VarType),
ItemSpecLength = item.Length,
DbNumber = item.DbNumber,
Area = (byte)item.Area,
Address = S7AddressItemSpecificationDatagram.GetAddress(item.Offset, item.VarType)
});
}
}
result.Header.ParamLength = (ushort)(2 + result.Items.Count * 12);
result.ItemCount = (byte)result.Items.Count;
return(result);
}