67
(7) Past data
Calculate the data T seconds earlier.
Format for entering the formula
OLD (X#T)
OLDH (X#T)
X: Data channel No.
T: Amount of time to go back (sec.)
The table below shows the difference between OLD and OLDH.
OLD
OLDH
Sampling cycle
1 s
0.1 s
Range of T
1 to 3600
1 to 300
(8) First delay filter
Filters the data of channel X.
Format for entering the formula
IIR (X#T)
X: Data channel No.
T: Time constant (sec.)
Calculation details
{dt÷(dt+t)}×(x-d)+d
dt: sampling cycle (0.1 s fixed)
t: time constantq
x: current value of channel X
d: previous operation results
(9) Example of arithmetic expression where calculations are combined
• (CH(1)*3-20)/6:
(Channel 1 data × 3 – 20)
÷
6
• (CH(1)+CH(2))<300:
When the sum of channel 1 and channel 2 is less than 300, the value
is 1.
• ABS(CH(1))>=50:
When absolute value of channel 1 is 50 or more, the value is 1.
• (PCH(1)>=100)AND(PCH(2)<=50): When channel 1 data has a value of 100 or more and
channel 2 data is 50 or less, the value is 1.
Handling Precautions
・
The following functions cannot be used together. Doing so will cause a calculation error.
ITG, ITG24, AVE, AVEH, OLD, OLDH, and IIR
Example: AVE(OLD(1#10)#60)