Type / N.
Rev.
Data
Page
Total pages
EW095.605
5
November 2010
56
96
EsiWelma
s.r.l.
8
SYSTEM STATUS
The information in this chapter is useful in order to understand the next chapter.
The field devices may be in any of the following operational statuses:
•
FA (fail)
•
A (activated)
•
DE (deactivated)
•
EX (expired) for detectors only
Their meaning is as follows:
8.1
Fail status
A field device that does not respond to a call from the control unit is automatically set to fail
status. The operator can manually set a field device to fail status (FA) only for the time they
are working on the setting screen and with the sole purpose of physically identifying it in the
system (its status LED is steady on). The control unit keeps the memory of FA units,
including their address and their settings. Any field device that is removed before it has
been deleted (for example to replace at some time), is recognized by the control unit as FA.
In particular, if a detector is in FA status, the control unit disenables all its assignments.
8.2
Activated status
The activated status is the normal operating status of each field device, set in the factory.
8.3
Deactivated status
The operator can only deactivate a field device manually. This has a different meaning
depending on the type of field device considered:
•
Detectors and AM:
if a detector is deactivated it no longer interfaces with all the DM
and RM modules (including the RM0 module of the control unit),
although it retains the other data - gas concentration reading,
digital input status (for AM), residual life, threshold set-points,
etc.
•
RM and DM modules: the deactivation of a module causes it to no longer interfaces
with all detectors and the AM assigned to it.
A field device in fail condition cannot be deactivated.
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