Schweitzer Engineering Laboratories SEL-751 - Table 4.63 Counter Input;Output Description

4.166
SEL-751 Relay Instruction Manual Date Code 20170927
Protection and Logic Functions
Logic Settings (SET L Command)
The pickup times of 0 for the SV03PU and SV04PU settings shown previ-
ously provide immediate Close and Trip actions from front-panel pushbuttons.
For a delayed Close, set SV03PU to the desired delay. Similarly, set SV04PU
for a delayed Trip action. See Table 8.4 for more detail.
Counter Variables
SELOGIC counters are up- or down-counting elements, updated every
processing interval.
Each counter element consists of one count setting, four control inputs, two
digital outputs, and one analog output. Figure 4.98 shows Counter 01, the first
of 32 counters available in the device.
Figure 4.98 Counter 01
Digital output SC01QD asserts when the counter is at position zero, and Digi-
tal output SC01QU asserts when the counter reaches the programmable count
value. Use the reset input (SC01R) to force the count to zero, and the analog
output (SCnn) with analog comparison operators. Table 4.63 describes the
counter inputs and outputs, and Table 4 .64 shows the order of precedence of
the control inputs.
SV INPUT SELOGIC SV04 := LT04
SV TIMER PICKUP 0.00–3000.00 SV05PU := 0.25
SV TIMER DROPOUT 0.00–3000.00 SV05DO := 0.25
SV INPUT SEL
OGIC SV05 := (PB02 OR LT03 OR
LT04) AND NOT SV05T
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Ta b le 4 . 62 S E L
OGIC Variable Settings (Sheet 2 of 2)
Setting Prompt Setting Range
Setting Name := Factory
Default
Table 4.63 Counter Input/Output Description (Sheet 1 of 2)
Name Type Description
SCnnLD Active High Input Load counter with the preset value to assert the out-
put (SCnQU) (follows SEL
OGIC setting).
SCnnPV Input Value This Preset Value is loaded when SCnLD pulsed.
This Preset Value is the number of counts before the
output (SCnQU) asserts (follows SEL
OGIC setting).
SCnnCU Rising-Edge Input Count Up increments the counter (follows SEL
OGIC
setting).
SCnnCD Rising-Edge Input Count Down decrements the counter (follows
SEL
OGIC setting).
SCnnR Active High Input Reset counter to zero (follows SEL
OGIC setting)
NOTE: These counter elements
conform to the standard counter
function block #3 in IEC 1131-3 First
Edition 1993-03 International
Standard for Programmable
controllers—Part 3: Programming
languages.
NOTE: If setting SCnnCD is set to NA,
the entire counter nn is disabled.
NOTE: If setting SCnnCU is set to NA,
the counter counts downwards only.
SC01PV
SC01R
SC01LD
SC01CU
SC01CD
Counter 01
SC01QU
SC01QD
SC01
SELOGIC
Output