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feat: Add WriteSzlReadRequest

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This commit is contained in:
Michael Croes
2023-07-21 22:28:22 +02:00
parent 18c3883dc0
commit 1fc6899905
1 changed files with 39 additions and 0 deletions
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39
S7.Net/PLCHelpers.cs
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@@ -56,6 +56,45 @@ namespace S7.Net
WriteS7Header(stream, s7MessageTypeUserData, parameterLength, dataLength);
}
private static void WriteSzlReadRequest(System.IO.MemoryStream stream, ushort szlId, ushort szlIndex)
{
WriteUserDataHeader(stream, 8, 8);
// Parameter
const byte szlMethodRequest = 0x11;
const byte szlTypeRequest = 0b100;
const byte szlFunctionGroupCpuFunctions = 0b100;
const byte subFunctionReadSzl = 0x01;
// Parameter head
stream.Write(new byte[] { 0x00, 0x01, 0x12 });
// Parameter length
stream.WriteByte(0x04);
// Method
stream.WriteByte(szlMethodRequest);
// Type / function group
stream.WriteByte(szlTypeRequest << 4 | szlFunctionGroupCpuFunctions);
// Subfunction
stream.WriteByte(subFunctionReadSzl);
// Sequence number
stream.WriteByte(0);
// Data
const byte success = 0xff;
const byte transportSizeOctetString = 0x09;
// Return code
stream.WriteByte(success);
// Transport size
stream.WriteByte(transportSizeOctetString);
// Length
stream.Write(Word.ToByteArray(4));
// SZL-ID
stream.Write(Word.ToByteArray(szlId));
// SZL-Index
stream.Write(Word.ToByteArray(szlIndex));
}
/// <summary>
/// Create the bytes-package to request data from the PLC. You have to specify the memory type (dataType),
/// the address of the memory, the address of the byte and the bytes count.