# Reading system LED states and physical diagnostics on PFC100 (750-8112)

**URL:** <https://www.wago.community/t/lecture-des-etats-led-systeme-et-diagnostics-physiques-sur-pfc100-750-8112/2705>\
**Category:** CODESYS\
**Created:** [April 30, 2026, 9:55am UTC](https://www.wago.community/t/lecture-des-etats-led-systeme-et-diagnostics-physiques-sur-pfc100-750-8112/2705 "2026-04-30T09:55:15Z")\
**Posts on this page:** 1\
**Showing post:** 2

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**Author:** ![ChristianBelote](https://sea2.discourse-cdn.com/flex016/user_avatar/www.wago.community/christianbelote/32/1762_2.png) [@ChristianBelote](https://www.wago.community/u/ChristianBelote)\
**Post date:** [May 4, 2026, 9:09pm UTC](https://www.wago.community/t/lecture-des-etats-led-systeme-et-diagnostics-physiques-sur-pfc100-750-8112/2705/2 "2026-05-04T21:09:57Z")

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Hi @jahedul ,

One option for this is to use the **WagoAppConfigTool** library. I have used this to pull some of the controller’s internal diagnostic/configuration information directly into a CODESYS application.

 ![image](https://us1.discourse-cdn.com/flex016/uploads/wago/original/2X/5/564c62e13717d82ff415c8bf2d6bcb6c1c1da2e0.png)

For example, the library can be used with calls such as:

`./get_led_config_state IO`

to read the configured state/color of the I/O LED, and:

`./get_actual_eth_config X1 cable-state`  
`./get_actual_eth_config X2 cable-state`

to check the physical Ethernet link/cable state of the X1 and X2 ports.

 ![image](https://us1.discourse-cdn.com/flex016/uploads/wago/original/2X/9/9fbb797b5084a749932d7daf4877dacc6281db98.png)

 ![image](https://us1.discourse-cdn.com/flex016/uploads/wago/original/2X/7/73ab2907ea3813f9a5a998eb5f00ec03233f8aee.png)

I attached a screenshot showing a simple test where I am calling the ConfigTool function blocks and storing the results in string variables.

I also made a separate forum post with more detail on using the library here:

[https://www.wago.community/t/howto-using-wagoappconfigtool-library-for-accessing-controller-diagnostics/2333](https://www.wago.community/t/howto-using-wagoappconfigtool-library-for-accessing-controller-diagnostics/2333)

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