13.35
Date Code 20171006 Instruction Manual SEL-400 Series Relays
SELOGIC Control Equation Programming
Effective Programming
➤ Work in a top-down method, specifying and moving to more detailed
levels, until you have sufficient information to create the settings. For
simple tasks, one level may be sufficient. For complex tasks, such as
automated station restoration, you may need several levels to move
from idea to implementation.
Comments
SELOGIC control equation comments are very powerful tools for dividing, docu-
menting, and clarifying your programming. Even if you completely understand
your programming during installation and commissioning, comments will be
very helpful if you need to modify operation a year later.
Create these comments in the fixed and freeform SEL
OGIC control equations, and
store these comments in the relay. Obtain comments to assist you in using the
ASCII interface or SEL configuration software, regardless of whether you have
the original files downloaded to the relay.
Comments add structure to freeform programming environments such as Visual
Basic, C, and freeform SEL
OGIC control equations. Example 13.22 shows how to
use comments to divide and structure freeform SEL
OGIC control equation pro-
gramming.
Example 13.22 Comments in Freeform SELOGIC Control Equation Programming
Use comments to divide and direct your eye through freeform programming.
#
# This is a header comment that divides sections of freeform programming
#
AMV003 := 15 * AMV003 # Explain this line here
#
# This comment is a header for the next section.
# Inputs: provide more detail for more complex tasks
# Outputs: describe how the programming affects the relay operation
# Processing: discuss how the programming itself operates
#
ASV004 := ACN01Q AND RB03 # First line of next section
Many texts on programming in various computer programming languages
suggest that you cannot include too many comments. The main reason to
include comments is that something you find obvious may not be obvious to
your coworker who will have to work with your programming in the future.
Adding comments also gives you the opportunity to think about whether the
program performs the function you intended.
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