323
Analog Input Functions and Operating Procedures Section 7-6
Response Time for a
Resolution of 500
µs/8,000
Unit: ms
The above response times are not affected by the number of analog I/O points
that are used.
Symbols m: Number of input words used in DM Area
n: Average number of buffers set for the input number for which to find the
response time
Calculation Example The following example calculations are for a resolution of 8,000 with an appli-
cation using inputs 1 and 8, 64 averaging buffers set for input 1, and no aver-
aging set for input 8.
• Response time for input 1: t = {(64
− 2) × 2 + 10.5} × 1/2 = 67.25 (ms)
• Response time for input 1: t = 1 × (2 + 2) × 1/2 = 2 (ms)
7-6-4 Peak Value Hold Function
The peak value hold function holds the maximum digital conversion value for
every input (including mean value processing). This function can be used with
analog input. The following diagram shows how digital conversion values are
affected when the peak value hold function is used.
The peak value hold function can be set individually for each input number by
turning on the respective bits (04 to 07) in CIO word n.
For the CIO word addresses, n = CIO 2000 + (unit number x 10).
mn
64 32 16 8 4 2 1
4 129.25 65.25 33.25 17.25 9.25 6 3
3 98.25 50.25 26.25 14.25 8.25 5 2.5
2 67.25 35.25 19.25 11.25 7.25 4 2
1 33.5 17.5 9.5 5.5 3.5 2.5 1.5
Peak value hold
Digital conversion value
t (Time)
Conversion value when
the peak value hold
function is used
15 14 13 12 11 10 09 08 07 06 05 04 03 02 01 00
Bit
Input 2
Input 1
Word n
The peak value hold function will be in effect
for the above input numbers while their
respective bits are ON. The conversion
values will be reset when the bits are turned
OFF.
Input 4
Input 3
To Next Page
Loading...
Need help?
General
