YSI IQ SensorNet 2020 XT Terminal - Manual (Page 21)

System 2020 XT USB Overview
1 - 15 ba76019e01 12/2012
1.3.3 Operation as backup controller
Automatic backup
function
If the MIQ/TC 2020 XT is configured as a terminal, it has a backup
controller that assumes the basic functions of the IQ S
ENSOR N ET
controller in the case of its failure. Thus the operating safety of the
system is considerably increased. For these purposes the MIQ/
TC 2020 XT regularly and automatically saves the system
configuration during the normal terminal operation.
System configuration The system configuration incudes the following allocations and
settings:
 Settings of sensors and diff. sensors
 Settings of outputs and links
 Edit list of sensors
 Edit list of outputs
 Measured value recording (datalogger settings)
 List of all components including software versions but without
terminal information.
 Application-related sensor calibration (e.g. matrix adjustment)
In the IQ S ENSOR N ET , the system configuration is stored in the
controller (MIQ/TC 2020 XT).
Functions of the MIQ/
TC 2020 XT
when operating as a
backup controller
If the MIQ/TC 2020 XT operates as a backup controller, all basic
IQ S
ENSOR N ET functions are carried out. Relay interfaces and current
interfaces, PROFIBUS, Modbus and RS485 work without restrictions.
Restrictions of the MIQ/
TC 2020 XT
when operating as a
backup controller
The following functions are not supported:
 Continuation of the data logger operation of the main controller
 Continuation of the modem communication of the main controller if
the modem is connected to the interface of the MIQ/TC 2020 XT
(configured as controller).
A redundant data logging function can be set up with the aid of the
MIQ/IF232 interface module.
Manual backup function In addition to the automatic backup of the system configuration you can
manually store the system configuration on a USB memory device at
any time. In the case of a system failure you can then transfer the
stored configuration from the USB memory device to another controller.