5-8
Control Logic
Date Code 20010731
SEL-352-1, -2 Instruction Manual
An attempt to set the relay with more than 17 operands will result in the message “Maximum of
17 elements allowed in a SEL
OGIC
equation.” The relay will then prompt the user to reenter the
equation. An attempt to save Group settings with more than 550 Relay Word bits or Global
settings with more than 50 Relay Word bits will result in the message “Too many SEL
OGIC
elements.” The relay will then return to the first nonhidden SEL
OGIC
control equations for
editing.
SEL
OGIC
control equation settings that are set directly to 1 (logical 1) or 0 (logical 0) also have
to be included in these limitations–each such setting counts as one element.
Table 5.4: Maximums for SEL
OGIC
Control Equations
Group Setting Class
Global Setting Class
Relay Word bits per Equation
17
17
Relay Word bits per Setting Class (including
Rising- or Falling-Edge Operators)
550 50
Equations per Setting Class
258
15
SEL
OGIC
Control Equation Set A Example
Objective:
Set all 38 digital inputs to trigger an event report with the MER SEL
OGIC
control
equation.
Limitation: MER can only accept 17 Relay Word bits.
Solution:
Use general-purpose SEL
OGIC
control equations SAA, SAB, and SAC to expand
the equation.
SAA = IN101 + IN102 + . . . + IN106
SAB = IN201 + IN202 + . . . + IN216
SAC = IN301 + IN302 + . . . + IN316
MER = SAA + SAB + SAC
SEL
OGIC
Control Equation Operators Example
Objective:
Use parentheses to simplify SEL
OGIC
control equations.
Solution: Put
“OR” conditions inside parentheses.
Содержание SEL-352-1
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