External Hmi Wake-Up Eihmi; Function Block; Functionality; Operation Principle - ABB RELION REX640 Technical Manual

Section 3
Basic functions
3.26
3.26.1
3.26.2
3.26.3
300

External HMI wake-up EIHMI

Function block

GUID-178E3AE3-6330-4D3C-A16D-FAB3B36B9588 V1 EN
Figure 170: Function block

Functionality

The external HMI wake-up function EIHMI is a control block that is used to control
certain parts of the HMI with Application Configuration in PCM600.
Some data can be bound to control options to enable the required features: remote
HMI wake-up, information when the device has been woken up and indication when
the Home button on the HMI is activated.
All functionalities described here are applicable only to paired HMI devices.

Operation principle

The input signal WAKEUP is used to wake the HMI from a low-power state and restore
the display's backlight if it has been dimmed or turned off. The display's backlight can
be controlled with parameter Backlight timeout under Configuration/HMI. The HMI
remains in normal operation mode as long as there is user input from the HMI or a
wake-up signal before the time set with Backlight timeout elapses.
The signal used to wake up the HMI is boolean rising edge. The wake-up can be
triggered only after the connected signal has been in FALSE state for longer than a
single function cycle.
The output signal HOME is activated when the capacitive Home button is activated on
the HMI unit. This generates a boolean TRUE value pulse that persists for a second
until the output is reset to FALSE. The output remains in this state until the Home
button is pressed again.
The output signal WOKEN is activated whenever the HMI device is woken from a low-
power state. This generates a one-second boolean TRUE value pulse. After one
second, the output is reset to FALSE. A new output can be triggered once the HMI has
entered the low-power state.
The output CONNECTION is activated whenever the paired HMI is connected to the
protection relay. If the communication between the protection relay and the HMI is
severed, this output resets itself to FALSE until communication has been restored.
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REX640
Technical Manual