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18 - External units
The default value will be the channel value before the WMPro has established contact with the unit
on startup. The Use default value eld can be toggled between "As startvalue" and "As startvalue &
on error". Choose the second option to also use the default value if there is an error in the external
unit, in other words if the WMPro loses contact with it and it appears in red on the View page.
"As startvalue" means that the channel will retain the previous value even if there is an error.
Use the "Error action channel" eld if you want to trigger an alarm or do something else if there is an
external unit error. If there is an external unit error, the error action channel has the value 1.
The error action channel works like
the output channel for alarms: If you
connect multiple external units to the
same error action channel, the error
action channel will contain the num-
ber of faulty connections.
To trigger an alarm, connect the alarm
to the channel you selected as the
error action channel. If there is more
than one channel connection to the
same unit you only need to link an error action channel to one of the connections.
18�6 Emails from external units
If you are collecting information
from a large number of meters, in an
M-Bus system for example, it might
be dicult to connect all the values
to channels, which are then saved to
databases. In any case, there will not
be enough channels and databases
for so many meters, especially if you
want the WMPro to act as a normal
controller too. That is why there is an
option to send values from external
units in emails.
These emails contain all the values
from all sensors of a particular type, in
table form. The emails, like database emails, are sent periodically. The data in the email is the latest
information received from all sensors.
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