I have adopted a workaround reading all the INT variable separated. |--connection-string 's7:tcp://192.168.1.192?controller-type=S7_1200' --field-addresses '%DB1:274.0:INT' '%DB1:276.0:INT' '%DB1:278.0:INT' '%DB1:280.0:INT' |
In this way on the wire you have: the query: |Frame 296: 111 bytes on wire (888 bits), 111 bytes captured (888 bits) on interface utun2, id 0 Null/Loopback Internet Protocol Version 4, Src: 192.168.100.4, Dst: 192.168.1.192 Transmission Control Protocol, Src Port: 57188, Dst Port: 102, Seq: 48, Ack: 50, Len: 67 TPKT, Version: 3, Length: 67 ISO 8073/X.224 COTP Connection-Oriented Transport Protocol S7 Communication Header: (Job) Parameter: (Read Var) Function: Read Var (0x04) Item count: 4 Item [1]: (DB 1.DBX 274.0 INT 1) Item [2]: (DB 1.DBX 276.0 INT 1) Item [3]: (DB 1.DBX 278.0 INT 1) Item [4]: (DB 1.DBX 280.0 INT 1) | the answer: |Frame 297: 89 bytes on wire (712 bits), 89 bytes captured (712 bits) on interface utun2, id 0 Null/Loopback Internet Protocol Version 4, Src: 192.168.1.192, Dst: 192.168.100.4 Transmission Control Protocol, Src Port: 102, Dst Port: 57188, Seq: 50, Ack: 115, Len: 45 TPKT, Version: 3, Length: 45 ISO 8073/X.224 COTP Connection-Oriented Transport Protocol S7 Communication Header: (Ack_Data) Parameter: (Read Var) Function: Read Var (0x04) Item count: 4 Data Item [1]: (Success) Item [2]: (Success) Item [3]: (Success) Item [4]: (Success) | |[INFO ] 10:15:44.727 it.fox.datapicker.HelloPlc4x.printResponse() - Value[value-0]: 10 [INFO ] 10:15:44.733 it.fox.datapicker.HelloPlc4x.printResponse() - Value[value-1]: 11 [INFO ] 10:15:44.737 it.fox.datapicker.HelloPlc4x.printResponse() - Value[value-2]: 12 [INFO ] 10:15:44.741 it.fox.datapicker.HelloPlc4x.printResponse() - Value[value-3]: 13 | Unfortunately my java knowledge are not so advanced to fix the bug in reading the array in a single command, anyway there’s a workaround. Hope this mail help some newbies like me to find the right way to read data from the PLC. Regards, Stefano On 28/07/2020 11:38, Stefano Bossi wrote: > Dear plc4x forum, > > I have found a possible problem in reading an array of INT. > I am using the HelloPlc4x app for testing and I am trying to read the > field address: |'%DB1:274.0:INT[3]'| > > In the request, captured via wireShark I can see the query: > > |Frame 3: 75 bytes on wire (600 bits), 75 bytes captured (600 bits) on > interface utun2, id 0 Null/Loopback Internet Protocol Version 4, Src: > 192.168.100.4, Dst: 192.168.1.192 Transmission Control Protocol, Src > Port: 54543, Dst Port: 102, Seq: 1, Ack: 1, Len: 31 TPKT, Version: 3, > Length: 31 ISO 8073/X.224 COTP Connection-Oriented Transport Protocol > S7 Communication Header: (Job) Parameter: (Read Var) Function: Read > Var (0x04) Item count: 1 Item [1]: (DB 1.DBX 274.0 INT 3) Variable > specification: 0x12 Length of following address specification: 10 > Syntax Id: S7ANY (0x10) Transport size: INT (5) Length: 3 DB number: 1 > Area: Data blocks (DB) (0x84) Address: 0x000890 | > > and the response: > > |Frame 4: 75 bytes on wire (600 bits), 75 bytes captured (600 bits) on > interface utun2, id 0 Null/Loopback Internet Protocol Version 4, Src: > 192.168.1.192, Dst: 192.168.100.4 Transmission Control Protocol, Src > Port: 102, Dst Port: 54543, Seq: 1, Ack: 32, Len: 31 TPKT, Version: 3, > Length: 31 ISO 8073/X.224 COTP Connection-Oriented Transport Protocol > S7 Communication Header: (Ack_Data) Parameter: (Read Var) Function: > Read Var (0x04) Item count: 1 Data Item [1]: (Success) Return code: > Success (0xff) Transport size: INTEGER (0x05) Length: 6 Data: > 000a000b000c | > > The 3 INT I would like to read are there: |000a|, |000b|, |000c| but > in the response of: > > |PlcReadResponse syncResponse = readRequest.execute().get(); | > > only the first one is present. > > I read in jira that there was a similar bug here PLC4X-57 > <https://issues.apache.org/jira/browse/PLC4X-57>, is this the same > problem? > > Thanks for your help. > > Regards, > Steafano Bossi > >
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