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How to recover from socket error 10054 (Modbus TCP)?
See original GitHub issueHello all,
I am testing the Modbus functionality using an Advantech WISE-4060/LAN module. I am reading 3 coils at a 1 second interval. The communication drops and I noticed ErrorBusy exception messages in the logging of my test application. My initial test application used libplctag but I was unable to get more logging than ErrorBusy. Then I rewrote the test application to use libplctag.NativeImport and this provided more logging:
[current iteration: 731, current handle: 0]: 0
2021-09-16 11:48:37.504 thread(1) tag(12) INFO plc_tag_read:1131 Starting.
2021-09-16 11:48:37.504 thread(1) tag(12) DETAIL mb_read_start:1746 Starting.
2021-09-16 11:48:37.504 thread(1) tag(12) DETAIL mb_read_start:1769 Done.
2021-09-16 11:48:37.518 thread(3) tag(12) INFO create_read_request:1205 Starting.
2021-09-16 11:48:37.519 thread(3) tag(12) DETAIL create_read_request:1207 seq_id=2198
2021-09-16 11:48:37.519 thread(3) tag(12) DETAIL create_read_request:1208 registers_per_request = 2000
2021-09-16 11:48:37.520 thread(3) tag(12) DETAIL create_read_request:1209 base_register = 2
2021-09-16 11:48:37.520 thread(3) tag(12) DETAIL create_read_request:1210 register_count = 1
2021-09-16 11:48:37.520 thread(3) tag(12) INFO create_read_request:1217 preparing read request for 1 registers (of 1 total) from base register 2.
2021-09-16 11:48:37.521 thread(3) tag(12) DETAIL create_read_request:1294 Done.
2021-09-16 11:48:37.533 thread(3) tag(0) DETAIL write_packet:978 Full packet written.
2021-09-16 11:48:37.535 thread(3) tag(0) DETAIL write_packet:979 08 96 00 00 00 06 00 01 00 02
2021-09-16 11:48:37.535 thread(3) tag(0) DETAIL write_packet:979 00 01
2021-09-16 11:48:37.548 thread(3) tag(0) DETAIL read_packet:892 data_needed=4, packet_size=4, read_data_len=6
2021-09-16 11:48:37.549 thread(3) tag(0) DETAIL read_packet:892 data_needed=0, packet_size=4, read_data_len=10
2021-09-16 11:48:37.549 thread(3) tag(0) DETAIL read_packet:917 Received full packet.
2021-09-16 11:48:37.549 thread(3) tag(0) DETAIL read_packet:918 08 96 00 00 00 04 00 01 01 00
2021-09-16 11:48:37.549 thread(3) tag(12) INFO check_read_response:1120 Starting.
2021-09-16 11:48:37.549 thread(3) tag(12) INFO check_read_response:1137 Got read response 2198 of length 10 with payload of size 1.
2021-09-16 11:48:37.550 thread(3) tag(12) DETAIL check_read_response:1138 registers_per_request = 2000
2021-09-16 11:48:37.550 thread(3) tag(12) DETAIL check_read_response:1139 register_offset = 0
2021-09-16 11:48:37.550 thread(3) tag(12) DETAIL check_read_response:1140 byte_offset = 0
2021-09-16 11:48:37.550 thread(3) tag(12) DETAIL check_read_response:1141 copy_size = 1
2021-09-16 11:48:37.551 thread(3) tag(12) DETAIL check_read_response:1152 Read is complete.
2021-09-16 11:48:37.551 thread(3) tag(12) DETAIL check_read_response:1191 Done.
2021-09-16 11:48:37.563 thread(1) tag(12) INFO plc_tag_read:1246 elapsed time 58ms
2021-09-16 11:48:37.565 thread(1) tag(12) INFO plc_tag_read:1264 Done
[current iteration: 731, current handle: 1]: 0
2021-09-16 11:48:37.565 thread(1) tag(13) INFO plc_tag_read:1131 Starting.
2021-09-16 11:48:37.565 thread(1) tag(13) DETAIL mb_read_start:1746 Starting.
2021-09-16 11:48:37.565 thread(1) tag(13) DETAIL mb_read_start:1769 Done.
2021-09-16 11:48:37.579 thread(3) tag(13) INFO create_read_request:1205 Starting.
2021-09-16 11:48:37.580 thread(3) tag(13) DETAIL create_read_request:1207 seq_id=2199
2021-09-16 11:48:37.580 thread(3) tag(13) DETAIL create_read_request:1208 registers_per_request = 2000
2021-09-16 11:48:37.581 thread(3) tag(13) DETAIL create_read_request:1209 base_register = 3
2021-09-16 11:48:37.581 thread(3) tag(13) DETAIL create_read_request:1210 register_count = 1
2021-09-16 11:48:37.581 thread(3) tag(13) INFO create_read_request:1217 preparing read request for 1 registers (of 1 total) from base register 3.
2021-09-16 11:48:37.581 thread(3) tag(13) DETAIL create_read_request:1294 Done.
2021-09-16 11:48:37.594 thread(3) tag(0) DETAIL write_packet:978 Full packet written.
2021-09-16 11:48:37.596 thread(3) tag(0) DETAIL write_packet:979 08 97 00 00 00 06 00 01 00 03
2021-09-16 11:48:37.596 thread(3) tag(0) DETAIL write_packet:979 00 01
2021-09-16 11:48:37.609 thread(3) tag(0) DETAIL read_packet:892 data_needed=4, packet_size=4, read_data_len=6
2021-09-16 11:48:37.610 thread(3) tag(0) DETAIL read_packet:892 data_needed=0, packet_size=4, read_data_len=10
2021-09-16 11:48:37.610 thread(3) tag(0) DETAIL read_packet:917 Received full packet.
2021-09-16 11:48:37.610 thread(3) tag(0) DETAIL read_packet:918 08 97 00 00 00 04 00 01 01 00
2021-09-16 11:48:37.610 thread(3) tag(13) INFO check_read_response:1120 Starting.
2021-09-16 11:48:37.611 thread(3) tag(13) INFO check_read_response:1137 Got read response 2199 of length 10 with payload of size 1.
2021-09-16 11:48:37.611 thread(3) tag(13) DETAIL check_read_response:1138 registers_per_request = 2000
2021-09-16 11:48:37.611 thread(3) tag(13) DETAIL check_read_response:1139 register_offset = 0
2021-09-16 11:48:37.611 thread(3) tag(13) DETAIL check_read_response:1140 byte_offset = 0
2021-09-16 11:48:37.612 thread(3) tag(13) DETAIL check_read_response:1141 copy_size = 1
2021-09-16 11:48:37.612 thread(3) tag(13) DETAIL check_read_response:1152 Read is complete.
2021-09-16 11:48:37.612 thread(3) tag(13) DETAIL check_read_response:1191 Done.
2021-09-16 11:48:37.624 thread(1) tag(13) INFO plc_tag_read:1246 elapsed time 59ms
2021-09-16 11:48:37.627 thread(1) tag(13) INFO plc_tag_read:1264 Done
[current iteration: 731, current handle: 2]: 0
2021-09-16 11:48:38.642 thread(1) tag(11) INFO plc_tag_read:1131 Starting.
2021-09-16 11:48:38.642 thread(1) tag(11) DETAIL mb_read_start:1746 Starting.
2021-09-16 11:48:38.643 thread(1) tag(11) DETAIL mb_read_start:1769 Done.
2021-09-16 11:48:38.658 thread(3) tag(11) INFO create_read_request:1205 Starting.
2021-09-16 11:48:38.658 thread(3) tag(11) DETAIL create_read_request:1207 seq_id=2200
2021-09-16 11:48:38.659 thread(3) tag(11) DETAIL create_read_request:1208 registers_per_request = 2000
2021-09-16 11:48:38.659 thread(3) tag(11) DETAIL create_read_request:1209 base_register = 1
2021-09-16 11:48:38.660 thread(3) tag(11) DETAIL create_read_request:1210 register_count = 1
2021-09-16 11:48:38.660 thread(3) tag(11) INFO create_read_request:1217 preparing read request for 1 registers (of 1 total) from base register 1.
2021-09-16 11:48:38.660 thread(3) tag(11) DETAIL create_read_request:1294 Done.
2021-09-16 11:48:38.674 thread(3) tag(0) DETAIL write_packet:978 Full packet written.
2021-09-16 11:48:38.676 thread(3) tag(0) DETAIL write_packet:979 08 98 00 00 00 06 00 01 00 01
2021-09-16 11:48:38.676 thread(3) tag(0) DETAIL write_packet:979 00 01
2021-09-16 11:48:38.800 thread(3) tag(0) WARN socket_read:1229 socket read error rc=-1, errno=10054
2021-09-16 11:48:38.800 thread(3) tag(0) WARN read_packet:909 Error, PLCTAG_ERR_READ, reading socket!
2021-09-16 11:48:39.647 thread(1) tag(11) WARN plc_tag_read:1236 Read operation timed out.
2021-09-16 11:48:39.647 thread(1) tag(11) INFO plc_tag_read:1246 elapsed time 1004ms
2021-09-16 11:48:39.648 thread(1) tag(11) INFO plc_tag_read:1264 Done
2021-09-16 11:48:43.814 thread(3) tag(0) WARN socket_read:1229 socket read error rc=-1, errno=10054
2021-09-16 11:48:43.814 thread(3) tag(0) WARN read_packet:909 Error, PLCTAG_ERR_READ, reading socket!
<<< This goes on and on because of the client application, plc_tag_status returns 1 >>>
2021-09-16 13:10:07.090 thread(3) tag(0) WARN socket_read:1229 socket read error rc=-1, errno=10054
2021-09-16 13:10:07.090 thread(3) tag(0) WARN read_packet:909 Error, PLCTAG_ERR_READ, reading socket!
<<< Using the debugger to step over to the next tag. >>>
Something went wrong 1
[current iteration: 732, current handle: 0]: 0
2021-09-16 13:10:11.906 thread(1) tag(12) INFO plc_tag_read:1131 Starting.
2021-09-16 13:10:11.906 thread(1) tag(12) DETAIL mb_read_start:1746 Starting.
2021-09-16 13:10:11.907 thread(1) tag(12) DETAIL mb_read_start:1769 Done.
2021-09-16 13:10:12.098 thread(3) tag(0) WARN socket_read:1229 socket read error rc=-1, errno=10054
2021-09-16 13:10:12.098 thread(3) tag(0) WARN read_packet:909 Error, PLCTAG_ERR_READ, reading socket!
2021-09-16 13:10:12.910 thread(1) tag(12) WARN plc_tag_read:1236 Read operation timed out.
2021-09-16 13:10:12.910 thread(1) tag(12) INFO plc_tag_read:1246 elapsed time 1003ms
2021-09-16 13:10:12.911 thread(1) tag(12) INFO plc_tag_read:1264 Done
2021-09-16 13:10:17.105 thread(3) tag(0) WARN socket_read:1229 socket read error rc=-1, errno=10054
2021-09-16 13:10:17.105 thread(3) tag(0) WARN read_packet:909 Error, PLCTAG_ERR_READ, reading socket!
Something went wrong 1
<<< Using the debugger to step over to the last tag. >>>
[current iteration: 732, current handle: 1]: 0
2021-09-16 13:10:46.399 thread(1) tag(13) INFO plc_tag_read:1131 Starting.
2021-09-16 13:10:46.399 thread(1) tag(13) DETAIL mb_read_start:1746 Starting.
2021-09-16 13:10:46.399 thread(1) tag(13) DETAIL mb_read_start:1769 Done.
2021-09-16 13:10:47.163 thread(3) tag(0) WARN socket_read:1229 socket read error rc=-1, errno=10054
2021-09-16 13:10:47.163 thread(3) tag(0) WARN read_packet:909 Error, PLCTAG_ERR_READ, reading socket!
2021-09-16 13:10:47.400 thread(1) tag(13) WARN plc_tag_read:1236 Read operation timed out.
2021-09-16 13:10:47.400 thread(1) tag(13) INFO plc_tag_read:1246 elapsed time 1000ms
2021-09-16 13:10:47.401 thread(1) tag(13) INFO plc_tag_read:1264 Done
2021-09-16 13:10:52.169 thread(3) tag(0) WARN socket_read:1229 socket read error rc=-1, errno=10054
2021-09-16 13:10:52.169 thread(3) tag(0) WARN read_packet:909 Error, PLCTAG_ERR_READ, reading socket!
<<< And so on >>>
The code I am using is similar to the code provided at: https://github.com/libplctag/libplctag.NET/blob/master/src/Examples/CSharp NativeImport/NativeImportExample.cs and my connection string reads: “protocol=modbus_tcp&gateway=10.0.0.1:502=&path=0&elem_count=1&name=co1&debug=4”
Is this expected behaviour and should I recover from it by disposing the tags (libplctag) or destroying the tags (libplctag.NativeImport) or is there something else I can do to recover from this.
As a side node, I am using libplctag also with an Allen Bradley ControlLogix and I have not experienced issues like this with the Allen Bradley.
I tested this on versions:
Issue Analytics
- State:
- Created 2 years ago
- Comments:25 (13 by maintainers)
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@timyhac , it seems you already added the 2.4.0 libplctag libraries to the native export which contains the fix. I will retest the official nuget (and remove my Frankenstein solution) and close this issue.
Thanks for taking care.
I updated the NuGet and ran a test. It did not fail and it did not had to reconnect. The NuGet includes the libplctag library that fixes the issue so I’ll close the issue.