Analog Input Functions And Operating Procedures - Omron CJ1W-AD041-V1 Manual

Analog Input Functions and Operating Procedures

Calculation Example
3-6-4 Peak Value Hold Function
112
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} × 1/4 = 34 (ms)
• Response time for input 1: t = 1 × (2 + 2) × 1/4 = 1 (ms)
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.
Digital conversion value
Conversion value when
the peak value hold
function is used
The peak value hold function can be set separately for each input number by
turning ON the respective bits (00 to 07) in CIO word n.
Bit
15 14 13
Word n
Only bits 00 to 03 of CIO word n are
used for the CJ1W-AD041-V1.
For the CIO word addresses, n = CIO 2000 + (unit number × 10).
In the following example, the peak value hold function is in effect for input
number 1, and the unit number is 0.
Input condition
When mean value processing is used together with the peak value hold func-
tion, the mean value will be held.
As long as the peak value hold function is in effect, the peak value hold will be
held even in the event of a disconnection.
When the load to the CPU Unit is disconnected, the Peak Value Hold Bits (bits
00 to 07 of the word n for CJ1W-AD081-V1, bits 00 to 03 of the word n for
CJ1W-AD041-V1) are cleared and the peak value hold function is disabled.
Peak value hold
12 11 10 09 08 07
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.
Section 3-6
t (Time)
06 05 04 03 02 01
The maximum
200000
conversion
data value is
held for input
number 1.
00