Beckhoff IPC - Special Keys and UPS

Some of the Beckhoff Industrial PCs offer additional Special Keys with integrated LED's. These keys and LED's can be used and linked as per normal inputs and outputs.

When you add the Beckhoff PC under I/O devices in the tree view, 10 bit variables are created automatically below the inputs and outputs for each one.

S 1 .. : n Inputs from corresponding Special Keys.

ExtVoltageOk: If this bit is linked and its state isTRUE, the external power to the PC is ok.

LED 1 .. : n Outputs for corresponding LED's inside Special Keys.

”UPS” tab

Some Beckhoff Industrial PCs also have an integrated 24V UPS (uninterruptible power supply).

Enable: Activates the integrated 24V UPS.

Enable Automatic System Shutdown: Must be enabled if the PC shall shutdown after external power loss.

Wait time: The time, the system waits for shutdown after external power loss (time in seconds).

No Abort: If this box is checked and external power comes back during wait time, the system will stop the shutdown process.