3.26 External HMI wake-up EIHMI
3.26.1 Function block
Figure 193: Function block
3.26.2 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, remote acknowledgment of alarms, information when the device has
been woken up, indication when the Home button on the HMI is activated and
indication when alarms are being acknowledged either remotely or from the HMI.
All functionalities described here are applicable only to paired HMI devices.
3.26.3 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 input signal ALM_ACK is used to acknowledge all active and fleeting alarms.
These alarms are displayed on the HMI's alarms page and mini-alarms widget.
The signal used to acknowledge the alarms is boolean rising edge. Acknowledge
alarms can be triggered only after the connected signal has been in the FALSE state
for longer than a single function cycle. The actual acknowledgement takes effect
only after the ALM_ACKED output has been in the FALSE state for longer than 100
ms.
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
Basic functions
1MRS759142 F
320 REX640
Technical Manual
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