Process Image; Watchdog - WAGO 750 Series Manual

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Process Image

4 Process Image
The DALI Multi-Master Module always has a 24-byte process image.
This enables the I/O module to be addressed and configured either via a
dedicated IEC application, or using the WAGO DALI Configurator.
If the WAGO DALI Configurator is used, the DALI Multi-Master Module is
operated in the "Full mode", as a special DALI master module is employed. The
DALI master module switches the DALI Multi-Master Module to this operating
mode.
There is no difference between the "Full mode" and "Easy mode" when
representing the I/O modules in the process images for the fieldbuses and
software tools (except for the control configuration in WAGO-I/O-PRO).
The "Easy mode" is the set default. This mode must also be used if no program is
being used that has a DALI master module.
The mode depends on whether the mailbox is active or not.
4.1

Watchdog

The DALI Multi-Master Module can be configured in such a way that the
communication with a higher-level controller and the local bus communication
can be monitored by a watchdog. The watchdog is disabled in the factory
settings. If the watchdog detects a loss of communication, the DALI Multi-Master
Module briefly switches the DALI bus off and back on in order to trigger the
"System Failure Level" (SFL) of the DALI operating devices
No monitoring function with external power supply
This functionality only exists if the DALI Multi-Master Module powers the DALI
bus. If power is supplied by an external DALI power supply unit, the DALI bus
cannot be switched off in order to trigger the SFL.
In "Easy mode," the watchdog must be toggled actively via the process image. Bit
4 in byte 0 is available for this purpose. If no toggling occurs beyond the
watchdog time corresponding to the setting, the SFL is triggered.
No active toggling is necessary in "full mode," since a regular status query is
made via the mailbox.
The communication monitoring can be parameterized via the DALI Configurator
or with the help of macro 24. The time for the watchdog can be set in register 47.
The setting range is from 1 to 255 minutes. The watchdog can be enabled/
disabled with the WAGO DALI Configurator staring from Version 3.18.0.1180.
Manual
Version 1.4.3
WAGO-I/O-SYSTEM 750
753-647 DALI Multi-Master