# Connecting to IDEC 'Smart Relay'

**URL:** <https://forum.inductiveautomation.com/t/connecting-to-idec-smart-relay/111928>\
**Category:** Ignition\
**Created:** [November 4, 2025, 2:23pm UTC](https://forum.inductiveautomation.com/t/connecting-to-idec-smart-relay/111928 "2025-11-04T14:23:18Z")\
**Posts on this page:** 8\
**Page:** 1

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**Author:** ![harrison.m.freeman](https://avatars.discourse-cdn.com/v4/letter/h/54ee81/32.png) [@harrison.m.freeman](https://forum.inductiveautomation.com/u/harrison.m.freeman)\
**Post date:** [November 4, 2025, 2:23pm UTC](https://forum.inductiveautomation.com/t/connecting-to-idec-smart-relay/111928/1 "2025-11-04T14:23:18Z")

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Has anyone had success creating a working device connection to an IDEC FL1F ‘Smart Relay’? I can add a new device using Modbus TCP, but it won’t maintain the connection. It just gets stuck in what appears to be a connect/disconnect loop, with the log reading “java.net.SocketException: Connection reset…[hostname=192.168.1.3,port=502] Socket connection closed, DriverState was Connected.” And it records this same log message over and over every couple of seconds. Any help/info is greatly appreciated.

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**Author:** ![dkhayes117](https://sea1.discourse-cdn.com/inductiveautomation/user_avatar/forum.inductiveautomation.com/dkhayes117/32/68344_2.png) [@dkhayes117](https://forum.inductiveautomation.com/u/dkhayes117)\
**Post date:** [November 4, 2025, 2:33pm UTC](https://forum.inductiveautomation.com/t/connecting-to-idec-smart-relay/111928/2 "2025-11-04T14:33:36Z")

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Check your firewall settings and see if port 502 is being blocked.

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**Author:** ![pturmel](https://sea1.discourse-cdn.com/inductiveautomation/user_avatar/forum.inductiveautomation.com/pturmel/32/3295_2.png) [@pturmel](https://forum.inductiveautomation.com/u/pturmel)\
**Post date:** [November 4, 2025, 2:56pm UTC](https://forum.inductiveautomation.com/t/connecting-to-idec-smart-relay/111928/3 "2025-11-04T14:56:18Z")

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Have you subscribed to at least one register in that device? Many devices will forcibly close idle connections after ten seconds. Resulting in exactly that pattern of log messages.

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**Author:** ![harrison.m.freeman](https://avatars.discourse-cdn.com/v4/letter/h/54ee81/32.png) [@harrison.m.freeman](https://forum.inductiveautomation.com/u/harrison.m.freeman)\
**Post date:** [November 4, 2025, 3:28pm UTC](https://forum.inductiveautomation.com/t/connecting-to-idec-smart-relay/111928/4 "2025-11-04T15:28:09Z")

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Thank you for the reply. Negative, I have only ever gotten as far as the ‘disconnect loop.’

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**Author:** ![harrison.m.freeman](https://avatars.discourse-cdn.com/v4/letter/h/54ee81/32.png) [@harrison.m.freeman](https://forum.inductiveautomation.com/u/harrison.m.freeman)\
**Post date:** [November 4, 2025, 3:28pm UTC](https://forum.inductiveautomation.com/t/connecting-to-idec-smart-relay/111928/5 "2025-11-04T15:28:44Z")

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Thank you for the reply. I’ll be sure to check that out.

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**Author:** ![pturmel](https://sea1.discourse-cdn.com/inductiveautomation/user_avatar/forum.inductiveautomation.com/pturmel/32/3295_2.png) [@pturmel](https://forum.inductiveautomation.com/u/pturmel)\
**Post date:** [November 4, 2025, 3:34pm UTC](https://forum.inductiveautomation.com/t/connecting-to-idec-smart-relay/111928/6 "2025-11-04T15:34:30Z")

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> [@harrison.m.freeman](#):
>
> Negative, I have only ever gotten as far

Don't wait to set up a tag subscribed to a device register. Use manual addressing. Try with the default 1000ms tag group. If I'm right, the disconnect/reconnect loop will magically fix itself.

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**Author:** ![harrison.m.freeman](https://avatars.discourse-cdn.com/v4/letter/h/54ee81/32.png) [@harrison.m.freeman](https://forum.inductiveautomation.com/u/harrison.m.freeman)\
**Post date:** [November 4, 2025, 3:35pm UTC](https://forum.inductiveautomation.com/t/connecting-to-idec-smart-relay/111928/7 "2025-11-04T15:35:41Z")

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Thanks again. I’ll give that a shot.

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**Author:** ![harrison.m.freeman](https://avatars.discourse-cdn.com/v4/letter/h/54ee81/32.png) [@harrison.m.freeman](https://forum.inductiveautomation.com/u/harrison.m.freeman)\
**Post date:** [November 10, 2025, 1:41pm UTC](https://forum.inductiveautomation.com/t/connecting-to-idec-smart-relay/111928/8 "2025-11-10T13:41:32Z")

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**UPDATE:** Ended up being user error: I wasn’t setting up the IDEC unit correctly. There’s an additional ‘client/server’ setting that needs configured inside IDEC’s WindLGC software. After we got this squared away, we had no issues establishing a good connection.