YSI IQ SensorNet 2020 XT Terminal - Manual (Page 25)

System 2020 XT USB Overview
1 - 19 ba76019e01 12/2012
1.4.3 Availability of the system
As a basic principle, the IQ S ENSOR N ET offers a very high availability.
This is achieved by
 The two-wire connection technique that is not interference-prone
 The digital signal transmission resulting from this
 Tools for error diagnosis
– LEDs on the MIQ modules to check the available voltage
– Log book messages with instructions to eliminate problems
 The possibility to simply assign substitute components for
components to be exchanged.
Replacing components is simple and can be performed very quickly
(see section 7.4). The system configuration (Settings of sensors and
diff. sensors and Settings of outputs and links) and the measured
data are stored in the controller and remain stored when other
components are used.
Controller  No current measured data can be displayed,
processed or stored.
 If communication with the controller is disturbed,
output modules activate the error behavior after
2 minutes (see component operating manual of
the output module).
Terminal  The measured value display is not updated.
 The display does not react to entries.
 The system continues working.
 Stored measured data and the system
configuration remain stored in the MIQ/
TC 2020 XT.
Power supply
module like power failure (see section 1.4.1)
Component Behavior