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Siemens LOGO Soft Comfort Online Help Manual

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5.3 Special functions
LOGO!Soft Comfort Online Help
292 Operating Instructions, 11/2017
Reducing the input sensitivity of the analog comparator
You can delay the output of the analog comparator selectively by means of the "on delay"
and "off delay" SFBs. By doing so, you determine that output Q is only set if the input trigger
length Trg (= output of the analog comparator) exceeds the defined on delay time.
This way you can set a virtual hysteresis, which renders the input less sensitive to short
changes.
Particular characteristics to be noted when configuring
For help on analog block parameters, refer to the Analog value processing (Page 312)
section.
Special functions (Page 241)
5.3.3.4
Analog watchdog
Short description
This special function saves the process variable of an analog input to memory, and sets the
output when the output variable exceeds or drops below this stored value plus a configurable
offset.
Connection
Description
Input
En
A positive edge (0 to 1 transition) at input
En
saves the analog value at input
Ax
("Aen") to memory and starts monitoring of the analog range Aen +- Delta.
Input
Ax
Input
Ax
is one of the following analog signals:
• AI1 to AI8
(
*
)
• AM1 to AM6 (if 0BA6), AM1 to AM16 (if 0BA7), or AM1 to AM64 (if 0BA8)
• NAI1 to NAI32 (if 0BA7 or 0BA8)
• AQ1 and AQ2 (if 0BA7), or AQ1 to AQ8 (if 0BA8)
• NAQ1 to NAQ16 (if 0BA7 or 0BA8)
• The block number of a function with analog output
Parameter
Gain
Range of values: -10.00 to 10.00
Offset
Range of values: -10000 to 10000
Threshold 1:
Difference value above Aen: on/off threshold
Range of values: 0 to 20000
Threshold 2:
Difference value below Aen: on/off threshold
Range of values: 0 to 20000
p:
Number of decimals
Possible settings: 0, 1, 2, 3
Retentivity on = the status is retentive in memory.
Output
Q
Q
is set/reset, depending on the stored analog value and the offset.
* AI1 to AI8: 0 to 10 V corresponds with 0 to 1000 (internal value).
… 292 …


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