Instruction 93- digital filter – Maple Systems MAPware-7000 User Manual
Page 151
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MAPware-7000 Ladder Logic Guide
1010-1041 rev. 00
Instruction 93- Digital Filter
Expression:
Space Requirement: 1 line x 6 column Location Requirement: Middle, Right rail
Function:
When the input is ON, this instruction calculates the following formula to perform digital
filtering for input data A, using filter constant B, and stores the result in C.
Yn = (1 - FL) * Xn + (FL * Yn-1) where
Xn is the input data specified by A
FL is the filter constant; 1/10000 of value B (data range: 0 to 9999)
Yn is the computed result, stored in C
Yn-1 is result from the last scan
C+1 is used for internal data computations
This instruction is used for filtering analog input signals.
Execution Condition:
Input
Operation
Output
OFF
No execution
OFF
ON
Execution (PLC7000 Series is limited within range of 0
to 9999).
ON
Operand:
Coil or Bit
Register
Constant
Index
Name
X
Y B
S
T.
C.
M
X
W
Y
W
B
W
S
W
T C
D
I
J
K
M
W
A
Input Data
√
√
√
√
√ √
√
√
√
√
√
B
Filter
Constant
√
√
√
√
√ √
√
C
Output Data
√
√
√
√ √
√