Sel SEL-787 - Figure 8.25 Operator Control Pushbuttons and Leds

8.14
SEL-787 Relay Instruction Manual Date Code 20150130
Front-Panel Operations
Operation and Target LEDs
Lamp Test
The TARGET RESET pushbutton also provides a front-panel lamp test. Pressing
and holding TARGET RESET illuminates all the front-panel LEDs, and these
LEDs remain illuminated for as long as TARGET RESET is pressed. The target
LEDs return to a normal operational state after release of the TARGET RESET
pushbutton.
Other Target Reset Options
Use the ASCII command TAR R to reset the target LEDs; see Table 7.12 for
more information. Programming specific conditions in the SEL
OGIC control
equation RSTTRGT is another method for resetting target LEDs. Access
RSTTRGT in Global Settings (SET G Command) and see Table 4.43 for
further information.
Front-Panel Operator
Control Pushbuttons
The SEL-787 features four operator-controlled pushbuttons, each with two
programmable pushbutton LEDs, for local control as shown in Figure 8.25.
Figure 8.25 Operator Control Pushbuttons and LEDs
Pressing any one of these four pushbuttons asserts the corresponding PBn
(n = 01 through 04) Relay Word bit, and the corresponding PBn_PUL Relay
Word bit. The PBn Relay Word bit remains asserted as long as the pushbutton
is pressed, but the PBn_PUL Relay Word bit asserts only for the initial
processing interval, even if the button is still being pressed. Releasing the
pushbutton, and then pressing the pushbutton again asserts the corresponding
PBn_PUL Relay Word bit for another processing interval. The pushbutton
LEDs are independent of the pushbutton.
Pushbutton LEDs are programmable using front-panel settings PBnm_LED
(where n = 1 through 4 and m=A or B). PBnm _LED settings are SEL
OGIC
control equations that, when asserted, illuminate the corresponding LED for
as long as the input is asserted. When the input deasserts, the LED also
deasserts without latching.
Using SEL
OGIC control equations, you can readily change the default LED
and pushbutton functions. The user-configurable slide-in labels can be used to
mark the pushbuttons and pushbutton LEDs with custom names to reflect any
Factory-Default
Slide-In Label
PB2A_LED
PB2
PB2B_LED
PB3A_LED
PB3
PB3B_LED
PB4A_LED
PB4
PB4B_LED
Pushbutton LED PB1A_LED
Operator Control Pushbutton PB1
Pushbutton LED PB1B_LED