User Manual

LOGO! functions
4.4 Special functions list - SF
LOGO!
234 Manual, 06/2014, A5E33039675
4.4.35
Max/Min
Short description
The Max/Min function records the maximum or minimum value of Ax.
Symbol in LOGO!
Wiring
Description
En A signal at input En (Enable) outputs an analog value
to AQ, depending on the settings of parameters ERst
and Mode.
S1 S1 functions only when the parameter Mode is set to
2.
If Mode is set to 2, a change in status from 0 to 1 at
input S1 (selector) outputs the maximum value to AQ.
If Mode is set to 2, a change in status from 1 to 0 at
S1 outputs the minimum value to AQ.
Ax Input Ax is one of the following analog signals:
• AI1 to AI8 (*)
• AM1 to AM64
• NAI1 to NAI32
• AQ1 to AQ8
• NAQ1 to NAQ16
• Block number of a function with analog output
Parameter
Mode
:
Possible settings:
0, 1, 2, 3
Mode = 0: AQ = Min
Mode = 1: AQ = Max
Mode = 2 and S1= 0 (low): AQ = Min
Mode = 2 and S1= 1 (high): AQ = Max
Mode = 3: AQ = Actual value of Ax
ERst
(Enable Reset):
Possible settings:
ERst = 0: disable reset
ERst = 1: enable reset
Retentivity:
/ = no retentivity
R = the status is retentive
Output AQ The function issues a minimum, maximum, or current
value at AQ, depending on your configuration.
* AI1 to AI8: 0 V to 10 V corresponds with 0 to 1000 (internal value).
Parameter Mode