Proface LT4300M - 5.7 Modular HMI + Control" - Manual (Page 18)

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English
If you power up the rear module without connecting the display module, the logic controller
does not start and all outputs remain in the initial state. The power must be off when you
connect the 2 modules.
There are 2 ways to install the LT.
Installing the LT on the panel:
Installing the rear module on a DIN rail with a display module/rear module separation
cable: