4.2
SEL-2032 Communications Processor Instruction Manual Date Code 20120126
SELOGIC Control Equations
Inputs
SELOGIC control equation inputs include the current time, global elements (as
seen by executing the TA R G command), local elements (as seen by executing
the TAR n command), and arbitrary database bits.
Messages are triggered by the rising edge (or assertion) of the trigger
condition bit. You can use output messages for the following tasks:
➤ Request data from an IED.
➤ Send a command to an IED (to change setting groups, for
example).
➤ Send data you want stored to a printer or master device.
In addition to inputs and outputs, there are five global intermediate logic
variables and the 96 port-specific logic variables. You can use these variables
to write equations, the results of which may be used in output equations. Three
intermediate elements have pickup and dropout delay timers associated with
them.
Inputs
As shown in Figure 4.1, there are a number of different types of SELOGIC
control equation inputs. These include global elements, local elements, relay
elements, relay status information, arbitrary database bits, and timed
conditions.
Global Elements
Global elements exist within the Global data region that is common to all
port databases. Items within this region include the day of the week, remote
bits, intermediate SEL
OGIC control equation terms, and I/O board inputs and
outputs. These elements are defined in Section 6: Database. Global elements
are referenced in SEL
OGIC control equations by their element names. For
example, you would enter the Sunday day-of-week element in a SEL
OGIC
control equation as SUN.
Local Elements
Local elements exist within the Local data region of each port’s database.
Some of these elements are asserted by user-defined command receipt, some
by select-before-operate registers, some by SEL
OGIC control equations, and
others by data collection operation. These elements are defined in Section 6:
Database. To use a local element in a logic equation, you must give both its
port number and label. For example, to access element D1 on Port 3, the
element label to use is 3:D1. If the SEL
OGIC control equation you are writing
is port-specific, the port for elements on that port need not be specified.
Relay Elements
SEL relay elements are available on any SEL relay port that is collecting
element data (uses 20TARGET data collection). Each element may be
specified by its element label, preceded by the port number. For example, to
access relay element 52A on Port 4, you use 4:52A. If the element name
matches a local or global element, you must specify the region to identify the
proper element (e.g., 4:TARGET:IN1). If you write a port-specific equation,
the port for the desired relay element is in the local port, and the relay element
label is unique from any local and global elements, then you do not need to
specify the port number. You can view the relay element labels by using the
TAR n ALL, MAP n TARGET BL, or VIEW n TARGET BL commands.
Courtesy of NationalSwitchgear.com
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