Weidmuller WI-I/O-9-U2: Wireless Mesh I/O & Gateway User Manual V1.2.2 - Manual (Page 60)

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initiate the transmission of a mapping by writing to an internal register that then forces
the transmission to occur.
Note: Digital Input 1-8 cannot be used as a force trigger as the digital inputs are
continually being scanned by the internal processor and each time it scanned it
would force the mapping to be sent. If a digital input is required to be used as the
trigger, map the digital input to a general purpose bit storage register (501, 10501,
etc.) and then use this general purpose register to trigger the force mapping.
4.3.6 Startup/Force Configuration
When a module is first power up, it will transmit update messages to any remote
modules based on what input mappings are configured.
The module’s outputs however
will remain in the default
‘Off’ condition until it receives an update or “change-of-state”
messages from the remote modules, unless a Failsafe block has been configured for
the output in which case it will default to the value configured in the Failsafe block.
To ensure the module outputs get updated with the latest remote input status when first
powered on we can configure the module to
transmit a special “start-up /force” message
which will write a value into an internal register at the remote module/s. The remote
module/s can then use this register to force any mappings it has configured for the
destination.
When the Force register is activated any mapping configured with this force register will
immediately send an update messages to the destination so that its outputs can be set
to the latest value.
It may be necessary to configure a
“startup /force” message for each remote module
that sends values back to the module’s outputs.
Example configuration
In the example below, site A needs to be configured so that on start-up it writes to a
register at Site B. Site B then uses this register to trigger an update of any mapping it
has configured the communicates back to Site A. If the system has multiple remote
sites, Site A will need to configure
a ‘Startup/Force’ mapping for each remote site.
If there are multiple remotes, all mappings that are set to Site A should have the force
register configured for 501.