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User control in C#.NET for communication CP5611(in PC) to C7-315-2DP using s7 communications via profibus!

Created by: DUMLE at: 5/25/2006 9:33 AM (3 Replies)

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5/25/2006 9:33 AM	Rate (0)
DUMLE Posts: 9 Rating: (0)	Hi everyone, can anyone tell me which user control in C#.NET is for managing communication from CP5611(pluged in PC) to S7-315-2DP using s7 communication protocol via profibus!!!! I am out of ideas, tryed to use s732.dll and s732std.dll by DllImport, but no sucess, I just got System.NullReferenceException galing s7_get_device or s7_get_vfd or s7_init!!!!! Thanks in advance,
DUMLE Posts: 9 Rating: (0)	Last edited by: DUMLE at: 5/25/2006 10:52 AM
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5/25/2006 4:20 PM	Rate (1)
Dec Gold Expert Joined: 5/19/2006 Last visit: 10/23/2024 Posts: 549 Rating: (107)	Hi Dumle, Step 1: See Entry ID:16518259 of how to configure a connections; Step 2: In VS.NET C# project define the S7API interop as follow: [DllImport("s732.dll", SetLastError=true, CharSet=CharSet.Ansi, CallingConvention = CallingConvention.Winapi)] public static extern Int32 s7_init( String cp_name, String vfd_name, ref UInt32 cp_descr); [DllImport("s732.dll", SetLastError=true, CharSet=CharSet.Ansi, CallingConvention = CallingConvention.Winapi)] public static extern Int32 s7_get_vfd( String dev_name, UInt16 index, refUInt16 number_ptr, String vfd_name); //vfd_name should beS7_MAX_NAMLEN + 1 size [DllImport("s732.dll", SetLastError=true, CharSet=CharSet.Auto, CallingConvention = CallingConvention.Winapi)] public static extern Int32 s7_shut( UInt32 cp_descr); [DllImport("s732.dll", SetLastError=true, CharSet=CharSet.Auto, CallingConvention = CallingConvention.Winapi)] public static extern Int32 s7_set_window_handle_msg( UInt32 cp_descr, IntPtr hWnd, UInt32 cp_msg); [DllImport("s732.dll", SetLastError=true, CharSet=CharSet.Auto, CallingConvention = CallingConvention.Winapi)] public static extern Int32 s7_receive( UInt32 cp_descr, ref UInt16 cref, ref UInt16 orderid); etc... Step3: Call s7_get_vfd and get vfd_name for your CP_L2_1: Call s7_init Select between Async or Synch mode (how s7_receive will be called) see the manual Again Good Look Dumle Dec
	Last edited by: Dec at: 5/25/2006 4:33 PM
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5/26/2006 7:09 PM	Rate (0)
DUMLE Posts: 9 Rating: (0)	Thanks, but also this code does not work, I changed String to StringBuilder and CharSet.Unicode to CharSet.Ansi and everything is working. But I am encountering some data convertion problems. For example, calling s7_write_req I have to pass S7_WRITE_PARA, but how to correctly define structure to mach all managed types to unmanaged! I suppose I am doing it wrong: [StructLayout(LayoutKind.Sequential, CharSet=CharSet.Ansi)] public struct S7_WRITE_PARA { public UInt16 access; [MarshalAs( UnmanagedType.ByValTStr, SizeConst=(S7_MAX_NAMLEN+2))] public String var_name; public UInt16 index; public UInt16 subindex; public UInt16 address_len; [MarshalAs( UnmanagedType.ByValTStr, SizeConst=S7_MAX_ADDRESSLEN)] public String address; public UInt16 var_length; public byte[] var_value; }; And how to corectly define s7_get_read_cnf, I am confused about using (void )!!!!! [DllImport("s732.dll", SetLastError=true, CharSet=CharSet.Ansi, CallingConvention = CallingConvention.Winapi)] unsafe public static extern Int32 s7_get_read_cnf(void la, ref UInt16 var_lenght_ptr, byte[] some_val); Thanks for Your help,
DUMLE Posts: 9 Rating: (0)
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5/26/2006 9:02 PM	Rate (0)
CS Moderator Moderator Joined: 9/1/2005 Last visit: 11/18/2024 Posts: 4113 Rating: (195)	Closed: thread exists twice. The second thread is CP5611 on PC communication to S7-315 over profibus.
	My Forum is the place to personalize your profile, track your topics, and maintain content that interests you. Best regards CS Moderator
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