User Manual

LOGO! functions
4.1 Constants and connectors - Co
LOGO!
Manual, 04/2011, A5E03556174-01
139
2) Analog outputs
Analog outputs are identified by the letters AQ. Two analog outputs are available, namely
AQ1 and AQ2. An analog output can only be connected with the analog input of a function,
an analog flag AM or an analog output connector.
The following figure shows an example LOGO! configuration and the numbering of the inputs
and outputs for the circuit program.
AQ1 AQ2
tY pY
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M1 I1 V2+
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wl
1 2 1 2
|[t[hp]|ZtZ
y|uVz{vw
x]
x_
x\
x^
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1 2 1 2 1 2 1 2
hpYhpX
x[xZxYxX
p]p\p[pZhp[hpZtsR
y|uVz{vw
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y|uVz{vw
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1 2 1 2
1 2 1 2 1 2 1 2
Analog outputs Analog inputs Outputs
I
nputs
Flag blocks
Flag blocks are identified by the letters M or AM . These are virtual outputs, which output the
value of their inputs. LOGO! 0BA6 provides 27 digital flags M1 to M27 and 6 analog flags
AM1 to AM6. LOGO! 0BA7 provides 27 digital flags M1 to M27 and 16 analog flags AM1 to
AM16.
Startup flag
Flag M8 is set in the first cycle of the circuit program and can thus be used in your circuit
program as a startup flag. This signal is automatically reset after the circuit program has
completed its first cycle.
The M8 flag can be used in all further cycles for setting, deletion and evaluation procedures
in the same way as other flags.
Backlight flags M25 and M26
The M25 flag controls the backlight of the LOGO! onboard display. The M26 flag controls the
backlight of the LOGO! TD.
Note: The backlight lifetime of the LOGO! TD is 20,000 hours.