6.15
Date Code 20130214 Instruction Manual SEL-2414 Transformer Monitor
Settings
Global Settings (SET G Command)
The device reserves variables and memory for four DI cards, but hides the set-
tings when DI cards are not installed. For example, we install a DI card in Slot D
and apply the appropriate settings. We then remove the card from Slot D and
install the card into Slot 5. All settings associated with Slot D are stored, but the
variables are hidden. We can now enter new settings for the card in Slot E. If we
once again install the card (or another DI card) in Slot D, the previously saved
Slot D settings apply and the variables are no longer hidden.
Digital Input
Debounce
To comply with different control voltages, the SEL-2414 offers dc debounce as
well as ac debounce modes. Therefore, if the control voltage is dc, select the dc
mode of operation, and if the control voltage is ac, select the ac mode of opera-
tion. In general, debounce refers to a qualifying time delay before processing the
change of state of a digital input. Normally, this delay applies to both the process-
ing of the debounced input when used in device logic, as well as to the time
stamping in the SER. However, in some cases, it is also important to record the
time of first assertion of the input. This information is useful to time-align events
from two unsynchronized devices when one device operated on receipt of the
output from the other device. To this end, the SEL-2414 provides both the time of
first assertion information as well as the delayed time information as separate
Device Word bits when set to the dc debounce mode. Following is a description
of the two modes.
DC Mode Processing (DC Control Voltage)
Figure 6.7 shows the logic for the dc debounce mode of operation. To select the
dc mode of debounce, set IN101D to any number between 0 and 65000 ms. In the
figure, Input IN101 becomes IN101R (internal variable), after analog-to-digital
conversion. On assertion, IN101R starts Debounce Timer 1, producing Device
Word bit IN101 after the debounce time delay, and Device Word bit IN101E from
the edge detection logic. The debounce timer is a pickup/dropout combination
timer, with debounce setting IN101D applying to both pickup (pu) and dropout
(do) timers of both Debounce Timer 1 and Debounce Timer 2, i.e., you cannot set
any timer individually. For example, a setting of IN101D = 20 ms delays process-
ing of the input signal by 20 ms (pu) and maintains the output of the timer (do)
for 20 ms. Device Word bit IN101 is the output of the debounce timer. If you do
not want to debounce a particular input, still use Device Word bit IN101 in logic
programming, but set the debounce time delay to 0 (IN101D = 0).
Tab le 6.1 6 Rea r -Pa ne l Ter mi na l N u mbe r an d So f twa re Refere nc e Num be r
Correlation (DI Card)
Rear-Panel Terminal Number Software Reference Number
a
a
x = 3, 4, 5, or 6 (for example, IN401, IN402, etc. if the card was installed in Slot D).
01, 02 INx01
03, 04 INx02
05, 06 INx03
07, 08 INx04
09, 10 INx05
11, 12 INx06
13, 14 INx07
15, 16 INx08
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