4.203
Date Code 20170814
Instruction Manual
SEL-700G Relay
Protection and Logic Functions
Logic Settings (SET L Command)
Counter Variables
SEL
OGIC
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 4.138 shows Counter 01, the
first of 32 counters available in the device.
Figure 4.138
Counter 01
Digital output SC01QD asserts when the counter is at position zero, and
Digital 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 4.59 describes
the counter inputs and outputs, and Table 4.60 shows the order of precedence
of the control inputs.
SV INPUT
SEL
OGIC
SV12 := 0
•
•
•
•
•
•
Table 4.58
SEL
OGIC
Variable Settings
(Sheet 3 of 3)
Setting Prompt
Setting
Range
Default Settings
Description
Table 4.59
Counter Input/Output Description
Name
Type
Description
SCnnLD
Active High Input
Load counter with the preset value to assert the output
(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)
SCnnQU
Active High
Output
This Q Up output asserts when the Preset Value
(maximum count) is reached (SCn = SCnPV, n = 01 to
32).
SCnnQD
Active High
Output
This Q Down output asserts when the counter is equal
to zero (SCn = 0, n = 01 to 32).
SCnn
Output Value
This counter output is an analog value that may be
used with analog comparison operators in a SEL
OGIC
control equation and viewed using the COU
command.
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:
The SEL-700G tracks the
frequency using either voltage or
current. When tracking the frequency,
the processing interval varies with the
frequency.
NOTE:
If setting SCnnCD is set to NA,
the entire counter nn is disabled.
SC01PV
SC01R
SC01LD
SC01CU
SC01CD
Counter 01
SC01QU
SC01QD
SC01
SEL
OGIC
Output
Содержание SEL-700G Series
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