SATEC SA300 ezPAC Operation Manual - Manual (Page 70)

Chapter 7 Programming the SA300 Configuring Digital Inputs
70 SA300 Substation Automation Unit
Option Range Default Description
Pulse input mode Pulse mode
KYZ mode Pulse
mode Defines the type of a pulse on the input
when it receives external pulses. In pulse
mode, either leading, or trailing edge of
the input pulse is accepted. In KYZ mode,
both leading and trailing edges of the
input pulse are accepted.
Pulse polarity Normal (N.O.)
Inverting (N.C.) Normal Selects the active pulse edge that is
considered a pulse in pulse mode. For
normal polarity, the open to closed
transition is considered a pulse. For
inverting polarity, the closed to open
transition is considered a pulse.
It has no meaning in KYZ mode where
both transitions are active.
Debounce time 1-100 ms 1 ms The amount of time the state of the
digital input should not change before
being accepted as a new state. Too low
debounce time could produce multiple
events on the input change.
SOE Log Checked
Unchecked Checked
for DI1 -
DI16
When the box is checked, either transition
on the digital input is recorded to the
Sequence-of-Events log.
Fault Recorder Checked
Unchecked Unchecked When the box is checked, a positive
transition on the digital input (open to
closed transition event) triggers the Fault
recorder.
Debounce Time
The debounce time is assigned to digital inputs in groups of 8 adjacent inputs. So,
DI8 has the same debounce time as inputs DI1 through DI7, while DI9 through DI16
are allowed to have another debounce time setting. When you change the debounce
time for one digital input, the same debounce time is automatically assigned to all
inputs related to the same debounce group.
Recording Digital Input Events to the Sequence-of-Events Log
To log transition events on digital inputs into the Sequence-of-Events log, you only
need to check the SOE log boxes for the digital inputs you want to be recorded. If you
link a digital input to the Fault recorder, it is automatically connected to the SOE log.
The pulse mode settings do not affect the SOE log.
Each digital input is recorded to the SOE log independently. A timestamp is typically
accurate to within 1 ms at 60Hz and 1.25 ms at 50Hz. The debounce time is included
in the timestamp.
Triggering the Fault Recorder through Digital Inputs
Any digital input can trigger the Fault recorder if its Fault recorder box is checked.
When an open-to-closed state transition is detected on the digital input, the global
“External Trigger” event is generated in the device. If the Fault recorder is enabled
(see
Device Mode Control ), it triggers the Fault recorder to record waveforms or RMS
data for the event.
When a number of digital inputs linked to the Fault recorder generate events at the
same time, only the first of them triggers the Fault recorder and logs a fault event into
the Fault log file. The next external fault event is not triggered until all the digital
inputs linked to the Fault recorder are released, but all operations on digital inputs are
automatically recorded to the Sequence-of-Events log. This does not affect
operations of the internal analog fault triggers that work independently.
Notice that the “External Trigger” event can also be tested through the control
setpoints from the “Static Events” trigger group to trigger another action on your
selection.