Siemens LOGO! - Analog Value Monitoring

193
LOGO! Manual
A5E00380835-01
4.4.19 Analog value monitoring
Short description
This special function saves the process variable of an ana-
log input to memory, and sets the output when the output
variable exceeds or drops below this stored value plus a
configurable offset.
Symbol in
LOGO!
Wiring Description
Input En A positive edge (0 to 1 transi-
tion) at input En saves the ana-
log value at input Ax (”Aen”) to
memory and starts monitoring
of the analog range Aen 
n.
Input Ax You apply the analog signal to
be monitored at input Ax.
Use the analog inputs AI1...AI8
(
*
)
, the analog flags
AM1...AM6, the block number
of a function with analog out-
put, or the analog outputs AQ1
and AQ2.
Parameter
A: Gain
Range of values:
10.00
B: Zero offset
Range of values: 10.000
n: Difference value for the
Aen on/off threshold
Range of values: 20.000
p: Number of decimals
Range of values:
0, 1, 2, 3
Output Q Q is set/reset, depending on
the stored analog value and
the offset.
* AI1...AI8: 0...10 V corresponds with 0...1000 (internal value).
LOGO! functions