Chapter 3 - Device Overview
UNITROL 1020 User Manual 3BHS335648 E82 59
for the channel changeover functionality.
The features included in the Redundant Channel support (channel changeover,
follow-up and communication) are in operation and active as long as the DCH
CAN communication is enabled and error-free. However, DCH Supervision can be
used independently of the existence of a second channel, and is therefore also
suitable for single channel applications. DCH Supervision does not depend on the
DCH CAN communication.
The Double Channel software must be available in the AVR (i.e. unblocked)
before the use of DCH Supervision and/or functions from Redundant Channel
support. Otherwise the configuration is not possible and Alarm, Trip and
Changeover digital output are unconditionally set to logical zero (i.e. not active).
The schema in Figure 3-10 shows the relationship between the main functions
described.
Alarm 1 assignation
.
.
.
Trip assignation
1
2
21
20
3
.
.
.
Status
(Latch)
Monitor
Functions
(8)
DCH Supervision
Supervision
Functions
(19)
Channel
Changeover
Logic
2nd Channel Trip
2nd Channel Alarm 1
Alarm 1 status
Standby
config
Standby
config
to DO
port
to DO
port
CAN communication data flow
Measurements, setpoint and
other data used by DCH
Follow-Up and user interfaces
Changeover status
Trip status
Configuration Matrix
DCH
Measurement &
Communication
Redundant Channel support
Channel Changeover
DCH Follow-up (block not shown)
DCH Communication
Comm Status
to 2nd
channel
Alarm 2 assignation
Alarm 2 status
Standby
config
Figure 3-10 Schema of main Double Channel functions.
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