Cannot read REAL value from S7-1500 with PLC4J #702
Comments
|
The odd thing is that I have a test with an S7-1200 to test all data-types ... this is a regular data-type which my PLC supports and I couldn't see any problems. Also that wireshark can't decode the response sort of seems to indicate that the problem might be your PLC. Is this a genuine Siemens S7-1500 or a clone? |
|
@chrisdutz this was a simulated S7 with the S7-PLCSIM Advanced V3.0. |
|
Hi, Driver version: 0.11.0-SNAPSHOT For CPU S7-300, work! (%MD100:REAL) We will have to perform other tests to find out the difference, |
|
Hi floka94, You can check if you have enabled PUT/GET reading on the CPU, you should do that before transferring the project. If so, please indicate so that the work team can close this point. For CPU S7-300, work! (%MD100:ACTUAL) Best regards, |
|
I updated my code and dependencies <dependency>
<groupId>org.apache.plc4x</groupId>
<artifactId>plc4j-api</artifactId>
<version>0.11.0-SNAPSHOT</version>
</dependency>
<dependency>
<groupId>org.apache.plc4x</groupId>
<artifactId>plc4j-driver-s7</artifactId>
<version>0.11.0-SNAPSHOT</version>
<scope>runtime</scope>
</dependency>It works for other datatypes like BOOL but still not for REAL using S7-PLCSIM Advanced V3.0.
|
|
Hello, I already tested and found no problems:
I'm preparing a full test run for the S7 driver. I uploaded a simple reading example in [1]. I hope it is useful for you. |
|
As I already said, it works for any other datatype but not for REAL. So the problem can not be because of the three points you mentioned. Thank you for the demo project. I will give it a try and inform you. |
|
Unfortunately the same Exception with your demo project. [main] INFO org.apache.plc4x.java.DefaultPlcDriverManager - Instantiating new PLC Driver Manager with class loader jdk.internal.loader.ClassLoaders$AppClassLoader@4b1210ee
[main] INFO org.apache.plc4x.java.DefaultPlcDriverManager - Registering available drivers...
[main] INFO org.apache.plc4x.java.DefaultPlcDriverManager - Registering driver for Protocol s7 (Siemens S7 (Basic))
[main] INFO org.apache.plc4x.java.transport.tcp.TcpChannelFactory - Configuring Bootstrap with Configuration{local-rack=1, local-slot=1, local-tsap=0, remote-rack=0, remote-slot=2, remote-tsap=0, pduSize=1024, maxAmqCaller=8, maxAmqCallee=8, controllerType='null'}
[nioEventLoopGroup-2-1] INFO org.apache.plc4x.java.s7.readwrite.protocol.S7ProtocolLogic - S7 Driver running in ACTIVE mode.
[main] INFO org.apache.plc4x.java.spi.connection.NettyChannelFactory - Channel is closed, closing worker Group also
[main] INFO org.apache.plc4x.java.spi.connection.NettyChannelFactory - Worker Group was closed successfully!
java.util.concurrent.ExecutionException: java.lang.NullPointerException: Cannot invoke "org.apache.plc4x.java.s7.readwrite.S7PayloadReadVarResponse.getItems()" because "payload" is null
at java.base/java.util.concurrent.CompletableFuture.reportGet(CompletableFuture.java:396)
at java.base/java.util.concurrent.CompletableFuture.get(CompletableFuture.java:2096)
at com.ceos.plc4x.s7.PLCReadTags.main(PLCReadTags.java:32)
Caused by: java.lang.NullPointerException: Cannot invoke "org.apache.plc4x.java.s7.readwrite.S7PayloadReadVarResponse.getItems()" because "payload" is null
at org.apache.plc4x.java.s7.readwrite.protocol.S7ProtocolLogic.decodeReadResponse(S7ProtocolLogic.java:765)
at org.apache.plc4x.java.s7.readwrite.protocol.S7ProtocolLogic.lambda$16(S7ProtocolLogic.java:231)
at java.base/java.util.concurrent.CompletableFuture$UniApply.tryFire(CompletableFuture.java:646)
at java.base/java.util.concurrent.CompletableFuture.postComplete(CompletableFuture.java:510)
at java.base/java.util.concurrent.CompletableFuture.complete(CompletableFuture.java:2147)
at org.apache.plc4x.java.s7.readwrite.protocol.S7ProtocolLogic.lambda$23(S7ProtocolLogic.java:269)
at org.apache.plc4x.java.spi.Plc4xNettyWrapper.decode(Plc4xNettyWrapper.java:187)
at io.netty.handler.codec.MessageToMessageCodec$2.decode(MessageToMessageCodec.java:81)
at io.netty.handler.codec.MessageToMessageDecoder.channelRead(MessageToMessageDecoder.java:88)
at io.netty.handler.codec.MessageToMessageCodec.channelRead(MessageToMessageCodec.java:111)
at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:442)
at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:420)
at io.netty.channel.AbstractChannelHandlerContext.fireChannelRead(AbstractChannelHandlerContext.java:412)
at io.netty.handler.codec.ByteToMessageDecoder.fireChannelRead(ByteToMessageDecoder.java:346)
at io.netty.handler.codec.ByteToMessageDecoder.channelRead(ByteToMessageDecoder.java:318)
at io.netty.handler.codec.ByteToMessageCodec.channelRead(ByteToMessageCodec.java:103)
at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:442)
at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:420)
at io.netty.channel.AbstractChannelHandlerContext.fireChannelRead(AbstractChannelHandlerContext.java:412)
at io.netty.channel.DefaultChannelPipeline$HeadContext.channelRead(DefaultChannelPipeline.java:1410)
at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:440)
at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:420)
at io.netty.channel.DefaultChannelPipeline.fireChannelRead(DefaultChannelPipeline.java:919)
at io.netty.channel.nio.AbstractNioByteChannel$NioByteUnsafe.read(AbstractNioByteChannel.java:166)
at io.netty.channel.nio.NioEventLoop.processSelectedKey(NioEventLoop.java:788)
at io.netty.channel.nio.NioEventLoop.processSelectedKeysOptimized(NioEventLoop.java:724)
at io.netty.channel.nio.NioEventLoop.processSelectedKeys(NioEventLoop.java:650)
at io.netty.channel.nio.NioEventLoop.run(NioEventLoop.java:562)
at io.netty.util.concurrent.SingleThreadEventExecutor$4.run(SingleThreadEventExecutor.java:997)
at io.netty.util.internal.ThreadExecutorMap$2.run(ThreadExecutorMap.java:74)
at io.netty.util.concurrent.FastThreadLocalRunnable.run(FastThreadLocalRunnable.java:30)
at java.base/java.lang.Thread.run(Thread.java:833)
EventDispacher Bye!
ObjectProcessor Bye!Here is ma recorded pcapng file, I hobe this can help you to find out the problem: |
|
Hello, In the captures (pcap) you can clearly see that the problem is in the PLCSIM response, specifically the length of the "Data.Item" is 32, when it should be 4 (the length of a real in bytes). The request job is correct byte for byte, relative to my local test. The value of 32 would be valid if the "Transport size" were in bits. For the moment I must point out that the problem is in the PLCSIM. I did the test with version 4.0 of PLCSIM, please, if you can download and try with this version, you have a 15-day trial license. I will be careful, |
|
I have tested it. Try https://github.com/spnettec/plc4x.git . heyoun branch |
|
I did quite a number of updates in the Java S7 driver. Could you please give the current SNAPSHOT another try? However I did test the writing of REAL values with my S7 1200 and that worked flawlessly. |
|
@floka94 can you confirm that this issue can be closed? |
|
Should be supported now. |
I cannot read REAL values from a S7-1500 with PLC4J with version 0.10.0.
I get the following error from the PLC4J Lib:
Screenshots from Wireshark:
Request from PLC4J to read REAL:
Response from S7-1500:
The text was updated successfully, but these errors were encountered: