Which LED on a 1756 digital I/O module indicates the on/off conditions of a field device?

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The I/O status LED on a 1756 digital I/O module is designed specifically to indicate the on/off conditions of field devices connected to that particular module. When a field device is active and receiving power, the I/O status LED will light up or change its state, providing a visual representation of that device's operational state. This functionality is essential for troubleshooting and monitoring, as it allows an operator to quickly ascertain whether a device is functioning as expected.

The module status LED generally signals the overall operational status of the module itself, while the fault status LED indicates whether there are any malfunctions or errors within the module. The fuse status would pertain to the condition of a protective fuse within the module, if applicable. These other LEDs serve different purposes and do not provide specific feedback regarding the individual state of the field devices connected to the I/O module.

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