Constants And Connectors – Co; Digital Inputs; Analog Inputs; Digital Outputs - Siemens Logo! Manual

LOGO! functions
4.1 Constants and connectors – Co
Constants and connectors (= Co) represent inputs, outputs,
flags and constant voltage levels (constants).
Inputs:

1) Digital inputs

Digital inputs are identified with an I. The number of the
digital inputs (I1, I2, ...) corresponds to the number of the
input connectors of the LOGO! Basic and of the connected
digital modules, in the order of their installation. See the
figure below.

2) Analog inputs

The LOGO! versions LOGO! 24, LOGO! 24o,
LOGO! 12/24RC and LOGO! 12/24RCo are equipped with
the inputs I7 and I8, which can also be programmed for use
as AI1 and AI2 inputs. Signals at the I7 and I8 inputs are
interpreted as digital values, and those at the AI1 and AI2
inputs are interpreted as analog values. The inputs of a
connected analog module are numbered according to the
already existing analog inputs. Special functions whose
inputs should only be connected to analog inputs are of-
fered in programming mode when you select the input sig-
nal, i.e. the analog inputs AI1...AI8, analog flags
AM1...AM6, the block numbers of a function with analog
output or the analog outputs AQ1 and AQ2.
Outputs:

1) Digital outputs

Digital outputs are identified by the character Q. The output
numbers (Q1, Q2, ... Q16) correspond with the numbers of
the output connectors at the LOGO! Basic and with those
of the expansion modules, in their order of installation. See
the following figure.
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LOGO! Manual
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