GE D90 Plus Instruction Manual page 429

CHAPTER 8: AUTOMATION
About automation virtual outputs
About automation one-shots
Automation math operators
PLUS
D90 LINE DISTANCE PROTECTION SYSTEM – INSTRUCTION MANUAL
The automation virtual output syntax is shown in the following table.
Table 35: Automation virtual output operators
Syntax Description
to Assigns the previous automation logic operand to the corresponding
VDO(1) VDO(96)
automation virtual digital output.
to Assigns the previous automation logic operand to the corresponding
VAO1 VAO64
automation virtual analog output.
The automation one-shot syntax is shown in the following table.
Table 36: Automation logic one shots
Syntax Description
One shot that responds to a positive-going edge.
POSITIVE ONE SHOT
One shot that responds to a negative-going edge.
NEGATIVE ONE SHOT
One shot that responds to both the positive and negative-going edges.
DUAL ONE SHOT
A one-shot accepts any digital input or the output of any logical operator. Its output will
assert for one scan following a transition of its input. A negative one-shot will operate on a
falling edge of its input, and a positive one-shot will operate on a rising edge of its input. A
dual one-shot will operate on a rising edge or falling edge of its input. A total of 64 one-
shots are available in the D90
Figure 343: One-shot used in automation logic
The automation logic math syntax is shown in the following table. Operators shown with
the suffix operate on two operands, whereas the others operate on one operand.
(a, b)
Table 37: Automation math operators
Syntax Description
Return the absolute value of the previous operand.
ABS
Return the arccosine value of the previous operand.
ACOS
Add the previous 2 operands.
ADD (a, b)
Return the arcsine value of the previous operand.
ASIN
Return the arctangent value of the previous operand.
ATAN
Return the arctangent value of the first operand divided by the second
ATAN2 (a, b)
operand, with a range of –180 to 180°.
Return the smallest integer greater than or equal to the operand.
CEIL
Return the cosine value of the previous operand.
COS
Divide the first operand by the second operand.
DIV(a, b)
Return the power of e (the base of natural logarithms) value of the previous
EXP
operand.
Return the largest integer less than or equal to the operand.
FLOOR
Return the remainder of the first operand divided by the second operand.
FMOD (a, b)
Return the imaginary value of the previous two operands, where the first
IMAG (a,b)
operand is the magnitude and the second operand is the angle.
Plus
automation controller.
AUTOMATION LOGIC
421