GE D90 Plus Instruction Manual page 490

AUTOMATION LOGIC
Automation timers
480
Figure 410: Using comparators to verify approximate equivalence
Unlike earlier versions of the D90
latches and not through setting menus. Automation timers have the following syntax:
TIMER (IN, PKP, DPO).
A timer accepts any digital input or the output of any logical operator as its
The timer output asserts when its input is asserted for a time equal to or greater than the
parameter. Likewise, the timer output resets when its input has been reset for a time
PKP
equal to or greater than its
For example, the following logic produces an output that picks up 10 seconds after contact
input F1 closes and drops out one second after the contact opens.
Figure 411: Using an automation timer
Virtual analogs also can be assigned to control the pickup and dropout of timers. In the
following example, two virtual analogs are used to define the pickup and dropout of two
timers.
Plus
, automation timers are implemented like gates or
parameter.
DPO
PLUS
D90 LINE DISTANCE PROTECTION SYSTEM – INSTRUCTION MANUAL
CHAPTER 8: AUTOMATION
parameter.
IN