Constants And Connectors - Co - Siemens LOGO! Series Manual

LOGO! functions

4.1 Constants and connectors - Co

4.1 Constants and connectors - Co
Constants and connectors (Co) represent inputs, outputs, flags, constant voltage levels
(constants), and network digital and analog inputs/outputs (if 0BA7).
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! Base Module and of the connected
digital modules, in the order of their installation. The fast digital inputs I3, I4, I5, and I6 of the
LOGO! versions LOGO! 24/24o, LOGO! 24C/24Co, LOGO! 12/24RC, LOGO! 12/24RCo and
LOGO! 12/24RCE can be used as fast counters.
2) Analog inputs
The LOGO! versions LOGO! 24, LOGO! 24o, LOGO! 24C, LOGO! 24Co, LOGO! 12/24RC,
LOGO! 12/24RCo and LOGO! 12/24RCE are equipped with the inputs I1, I2, I7 and I8, which
can also be programmed for use as AI3, AI4, AI1 and AI2 inputs. As described in topic
"Setting the number of AIs in the LOGO! Basic (Page 299)", you can configure these
modules to use either two analog inputs (AI1 and AI2), or all four. Signals at the I1, I2, I7 and
I8 inputs are interpreted as digital values, and those at the AI3, AI4, AI1 and AI2 inputs are
interpreted as analog values. Note that AI3 corresponds to I1 and AI4 corresponds to I2.
This numbering preserves the previous correspondence of AI1 to I7 and AI2 to I8 that was
available with the 0BA5 series. The inputs of a connected analog module are numbered
according to the already existing analog inputs. See topic "Maximum setup with expansion
and communication modules (Page 34)" for example setups. In programming mode, when
you select the input signal of a special function that takes an analog input, LOGO! offers the
analog inputs AI1 to AI8, analog flags AM1 to AM6 (0BA6) or AM1 to AM16 (0BA7), analog
outputs AQ1 and AQ2, and the block numbers of functions with analog outputs.
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! Base Module and with
those of the expansion modules, in their order of installation. See the following figure.
There are also 16 blank outputs available in LOGO! 0BA6 or 64 blank outputs available in
LOGO! 0BA7. These are identified with an x and cannot be reused in a circuit program (in
contrast to flags, for example). The list shows all programmed blank outputs, and one blank
output which is not yet configured. A blank output, for example, is useful for the special
function "Message texts" (Page 231) , if only the message text is of significance to a circuit
program.
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Manual, 04/2011, A5E03556174-01
LOGO!