User Manual

LOGO! functions
4.1 Constants and connectors
LOGO!
116 Manual, 06/2014, A5E33039675
Inputs
●
Digital inputs
Digital inputs begin with the letter
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. You can use the fast digital
inputs I3, I4, I5, and I6 of the LOGO! versions LOGO! 12/24 RCE, LOGO! 12/24 RCEo,
LOGO! 24 CE and LOGO! 24 CEo as fast counters.
Note
To avoid that the LOGO! Base Module fails to read input signals because its built
-
in MCU
(Microcontroller Unit) is too sensitive and runs much faster than those in previous LOGO!
devi
ces, an on-/off-delay function is designed for LOGO!:
•
For LOGO! 230RCE and LOGO! 230RCEo, a 25 ms on-delay time and a 20 ms off-
delay time are defined for digital inputs I1 to I8.
•
For all the other LOGO! versions, a 5 ms on-delay time and a 5 ms off-delay time are
defined for all the digital inputs.
Besides, when the LOGO! Base Module is in slave mode, a 5 ms on
-delay time and a
100 ms signal
-retentive-time are defined for all the digital inputs.
●
Analog inputs
The LOGO! versions LOGO! 24 CE, LOGO! 24 CEo, LOGO! 12/24 RCE and LOGO
12/24 RCEo have the inputs I1, I2, I7 and I8, which you can also program for use as
AI3,
AI4, AI1
and
AI2
inputs. As described in topic "Setting the number of AIs in LOGO!
(Page 266)", you can configure these modules to use either two analog inputs (AI1 and
AI2), or all four. LOGO! interprets signals at the I1, I2, I7 and I8 inputs as digital values,
and those at the AI3, AI4, AI1 and AI2 inputs 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. LOGO!
numbers the inputs of a connected analog module according to the already existing
analog inputs. See topic "Maximum setup with expansion modules (Page 29)" 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 AM64, analog outputs AQ1 to AQ8, and the block numbers of functions with
analog outputs.