Basler BE1-951 User Manual

9328900990 Rev L BE1-951 BESTlogic Programmable Logic 7-7
7-2. Currently, the virtual outputs are the only functions that can use the single AND or AND/OR
combination BESTlogic Expression Type.
The top of the screen displays the BESTlogic expression in a text window. Above the text window, the
selected input and the associated ASCII command are displayed.
The Clear button will clear the expression to 0. The Reset button will reset the expression to its original
state when the BESTlogic Expression Builder was first opened. The Cancel button resets the expression
to its original state when the BESTlogic Expression Builder was first opened and returns the user to the
previous screen. The Save button saves the expression shown in the text window and returns the user to
the previous window.
LOGIC SCHEMES
A logic scheme is a group of logic variables written in equation form that defines the operation of a multi-
function relay. Each logic scheme is given a unique name of one to eight alphanumeric characters. This
gives you the ability to select a specific scheme and be confident that the selected scheme is in
operation. Six logic schemes, configured for typical protection applications, are stored in nonvolatile
memory. Only one of these logic schemes can be active at a given time. In most applications,
preprogrammed logic schemes eliminate the need for custom programming. Preprogrammed logic
schemes may provide more inputs, outputs, or features than are needed for a particular application. This
is because the preprogrammed schemes are designed for a large number of applications with no special
programming required. Unneeded inputs or outputs may be left open to disable a function or a function
block can be disabled through operating settings. Unused current sensing inputs should be shorted to
minimize noise pickup.
When a custom logic scheme is required, programming time can be reduced by copying a
preprogrammed scheme into the active logic. The logic scheme can then be modified to meet the specific
application.
The Active Logic Scheme
Digital, multifunction relays must have an active logic scheme in order to function. All Basler Electric
multifunction relays are delivered with a default, active logic loaded into memory. The default, active logic
scheme for the BE1-951 is named BASIC-OC. If the function block configuration and output logic of
BASIC-OC meets the requirements of your application, then only the operating settings (power system
parameters and threshold settings) need to be adjusted before placing the relay in service.
If a different preprogrammed logic scheme is required, it can be easily copied to active logic and used as
is or customized to your specifications. To accomplish this, communication with the relay must be
established. It is accomplished by connecting a computer to the front or rear RS-232 port.
Logic schemes can be selected from the logic select tab on the BESTlogic screen. To access this screen,
select BESTlogic from the S
creens pull-down menu. Then select the Logic Select tab. Select the desired
logic scheme to Copy to Active Logic (Internal Logic). The active logic scheme is shown in the Logic
Name box. In
Figure 7-6, BASIC-OC has been selected as the user logic.
NOTE
There has been a fundamental improvement to the way the user sets up
BESTlogic in this device. In some prior implementations of BESTlogic, it was
necessary to make a separate setting that determined whether the user's logic
scheme or if one of the pre-programmed logic schemes was to be made active.
This setting was made from the ASCII command interface using the SP-LOGIC
(Set Protection Logic) command. This setting has been eliminated.
In the implementation of BESTlogic used in this relay, the logic scheme defined
by the user's logic settings is always active. If the user wishes to use a
preprogrammed logic scheme, he/she now copies it into his/her user logic
settings. This process is accomplished from the ASCII command interface using
the SL-N (Set Logic Name) command in this and previous BESTlogic
implementations.

Basler BE1-951 Specifications

General

Brand	Basler
Model	BE1-951
Category	Surge Protector
Language	English