Recent changes to support-requests

segmentation fault

Ali Kanarya — Thu, 24 Aug 2017 15:33:50 -0000

I have used your lib before successfully.
After long time, I have an another project now and I am using my own old libnodave related files.
My old working system was QT4. Now I am using QT5 on win8.1.
I am directly loading libnodave.dll in my software.
Compilitation is succesfull but when software comes to make a connection,
at daveNewConnection(..) function call, my software crashes with seg fault error.
opensocketw function works before this call, I am monitoring it.
Plc accepts connection.
I am stuck, any help is highly appreciated.
Thanks. Ali.

S7 200 FROM ETH

mario — Wed, 27 Jan 2016 23:01:51 -0000

Hy, can Libnodave access S7-200 by ethernet (using a CP241) Thanks!

Turn off debug screen

Nguyễn Phan Hùng Thuận — Thu, 01 Oct 2015 18:41:04 -0000

Hi, can you show me how to turn off the debug screen?

Segmentation fault and Timeout daveReadbytes and daveGetU16

Clive — Tue, 11 Aug 2015 15:32:24 -0000

Hi,

I am using libnodave on Linux system, to read/write data serially using PPI/RS232 cable between PC and PLC S7-200. I have managed to start/stop PLC and writebytes to PLC. BUt for some unknown reason I did not manage to read bytes. I have used libnodave version 0.8.5.1 using c programming language. when I do the following call I always get a segmentation fault on daveGetU16(dc) function call..

                        res=daveReadBytes(dc,daveOutputs,0,0,1,NULL);
                          read_buf[0]=daveGetU16(dc);

Also if I follow the following call format still I am not able to read any bytes from PLC. I always get timeout error.

                        res=daveReadBytes(dc,daveOutputs,0,0,1,read_buf);
                        printf("cnt=%d,res=%d, Reading_Memory BUFFER=%d \n",cnt,res,read_buf[0]);

 DId anyone make the readbytes function work on LINUX with S7-200 PLC using C programming language? Any suggestions ?

 Thanks for your help. Appreciated.

#12 Can not connect to PLC when third node (HMI) is added to the MPI bus

Moritz Rathgeber — Tue, 05 May 2015 15:05:08 -0000

turned out that this is not really a software issue:

1) they changed the power supply of some component (``change USB power supply to S7 power supply''---um, yeah)

-> connection worked when PC was connected to the Profibus after HMI and PLC were running

2) the PC must not use MPI address 0 (PLC has address 2, HMI as address 7)

-> connection worked also when starting the machines with all parts connected

3) then, initialisation still failed some times, which was fixed by replacing the MPI-USB interface with what seems to be a less defective one.

To summarise: Don't stay on MPI address 0, then blame the hardware.

Good thing that no one wasted time on this :-)

Can not connect to PLC when third node (HMI) is added to the MPI bus

Moritz Rathgeber — Thu, 12 Mar 2015 13:54:17 -0000

Hello,

I use the Prozess-Informatik 9352-USB MPI-USB interface, PLCVCOM, and libnodave to connect to a PLC. This works as long as the MPI-Interface and the PLC are the only devices on the bus (output of testMPI -d in attached file libnodave0.8.4.4-mpi-no-hmi.txt). But when the HMI is also connected to the same MPI bus, daveConnectPLC() fails with timeout (libnodave0.8.4.4-mpi-with-hmi.txt). Communication between PLC and HMI works however (or so I'm told, I'm not on site).

daveProtoMPI2 behaves the same way, daveProtoMPI3 successfully completes initialisation, but later _daveGetResponseMPI3 fails with -10 (with or without HMI). I also tried libnodave 0.8.5: No difference.

The PLC is a S7 313C, the HMI is Provicom MT-50.

This is the first time we use MPI (always used WinAC RTX before), so I might miss something obvious.

best regards

Android read data from different datablocks

Florian — Thu, 30 Jan 2014 10:21:01 -0000

Hey guys,
im trying to read 4 integers from 4 different datablocks at one time.
Currently i do this in a for-loop with 4 "read orders". But it takes about 2 seconds for it.
Is there a way to do those 4 reads in one "big read"?
this is what i have:

for (int i = 0; i < DBnums.length; i++) {
String inst_no = DataIsoTCP.ReadData(Nodave.DB, DBnums[i], 4, 2, 0);
System.out.println(inst_no + " " + DBnames[i]);
}

hope someone can help me

greetz Stuck

Java Eclipse S7300 TCP_IP

Flemming Astrup — Sun, 27 Jan 2013 11:30:25 -0000

Hello is there anyone who can help me with a simple Java or android project that can communicate with a S7300 PLC via TCP_IP. I found some examples, but they have not worked. a simple project where I can read and write 10 bytes will be fine. I would be very grateful if someone would help me start I use Eclipse as JDK

iPad with libnodave

Otto Gutierrez — Sun, 07 Oct 2012 13:06:42 -0000

Hello,

I was wondering if anyone has communicated to a siemens plc through an iPad or iPhone.
Would it be possible to do it with the library libnodave?

Thanks!

Connection error S7-200 - help

CavalloPazzo — Fri, 07 Sep 2012 16:08:20 -0000

Hi all,
I have a s7-200 plc connected by USB/PPI calbe 6ES7 901-3db30-0XA0 using WINDOWS XP PRO SP3.
I am able to manage and work with plc using MicroWin .
I downloaded the last version of libnodave-0.8.4.6 and I tried to connect with some exe test file as testPPI.exe under "win folder", but I am not able to reach PLC. I used also .cs file in order to create my application but the connection doesn't work. I noted that cable it's not posted (using device managment windows) under LPT/COM but under HID (human interface device): maybe this the problem? If yes, did you have suggestion in order to estabilish a connection with plc? maybe here the error "(libnodave.setPort(args[0],"9600",'E)". any suggestion are welcome!
Hoping for answer and thank you in advance,
best regards,

Luciano