635-SERIES HARDWARE M ANUAL
Chapter-Page
2-73
10.5 About setting up Supervision & Hypervision of Inputs
Supervision & Hypervision modes
are programmable Built-in features of the DIO Board and
are enabled at the software in the Input Programming Screen
after supervision resisters have
been installed at the device.
SUPERVISION OF INPUTS:
Supervision
provides the input circuit with a different voltage depending on the resistor values
used. The DIO board monitors the alternating voltages and compares them with the appropriate
thresholds to determine the current state of the input. When the board determines that either
the actual voltage transitions for any of the thresholds, or the two alternating states do not
match, the board will report the appropriate event (alarm, trouble) to the software Event and
Alarm Screen. Alarm programming and alarm priorities apply.
CAUTION:
The thresholds are set at default values to work with the corresponding supervision resistor
values, and should be adjusted only when necessary to compensate for line resistance. It is
possible render an input non-operational by setting the values too high or low.
Figure 56 – Diagram of the end of line resistors for input supervision:
