Schweitzer Engineering Laboratories SEL-387E - Selecting the Active Setting Group

4-4 Control Logic Date Code 20080110
SEL-387E Instruction Manual
For example, if Setting Group 4 is the active setting group, Relay Word bit SG4 asserts to
logical 1 and the other Relay Word bits SG1, SG2, SG3, SG5, and SG6 are all deasserted to
logical 0.
Selecting the Active Setting Group
The active setting group is selected with:
• SEL
OGIC control equation settings SS1 through SS6,
• the serial port GRO n command (see Section 7: Communications), or
• the front-panel GROUP pushbutton (see Section 8: Front-Panel Operation).
SEL
OGIC control equation settings SS1 through SS6 have priority over the serial port GRO n
command and the front-panel GROUP pushbutton in selecting the active setting group. Within
the SS1 through SS6 settings the currently active group setting SSn has priority over the other
group SSn variables.
Operation of SEL
OGIC Control Equation Settings SS1 through SS6
The Global settings contain the set of SEL
OGIC control equation settings SS1 through SS6. If the
SEL
OGIC control equation for setting SSn (n = 1 to 6) is TRUE (logical state 1), the relay is
instructed to go to, or remain in, Setting Group n.
Table 4.1: Definitions for Active Setting Group Switching
SEL
OGIC Control Equation Settings SS1 through SS6
Setting Definition
SS1 go to (or remain in) Setting Group 1
SS2 go to (or remain in) Setting Group 2
SS3 go to (or remain in) Setting Group 3
SS4 go to (or remain in) Setting Group 4
SS5 go to (or remain in) Setting Group 5
SS6 go to (or remain in) Setting Group 6
The operation of these settings is explained with the following example:
Assume the active setting group starts out as Setting Group 3. Corresponding Relay Word bit
SG3 is asserted to logical 1 as an indication that Setting Group 3 is the active setting group.
With Setting Group 3 as the active setting group, setting SS3 has priority. If setting SS3 is
asserted to logical 1, Setting Group 3 remains the active setting group, regardless of the activity
of settings SS1, SS2, SS4, SS5, and SS6. With settings SS1 through SS6 all deasserted to
logical 0, Setting Group 3 still remains the active setting group.
With Setting Group 3 as the active setting group, if setting SS3 is deasserted to logical 0 and one
of the other settings (e.g., setting SS5) asserts to logical 1, the relay switches from Setting