User Manual

LOGO! functions
4.3 Special functions
LOGO!
128 Manual, 06/2014, A5E33039675
Connector X at SF inputs
The connector "x" input for any SF input is low. That is, the input carries a "lo" signal.
Parameter inputs
At some of the inputs you do not apply any signals. You configure the relevant block values
instead. Examples:
●
Par (Parameter):
You do no connect the Par parameter. Instead, you set the relevant blcok parameters
(times, on/off thresholds etc.).
●
Priority:
This is an open input. Here, you define priorities and specify whether a message is to be
acknowledged in RUN.
4.3.2
Time response
Parameter T
You can configure a time value T for some of the SF blocks. When you preset this time, note
that your input values are based on the timebase set:
Timebase
_ _ : _ _
s (seconds)
seconds :
1
/
100
seconds
m (minutes)
minutes : seconds
h (hours)
hours : minutes
The LOGO! 0BA8-specific stopwatch (Page 171) function provides an additional timebase -
10 ms.
Accuracy of T
Because of slight tolerances in the characteristics of electronic components, the set time T
can deviate. You can find a detailed description of such deviations in the "On-delay" topic
(Page 136).
Accuracy of the timer (weekly/yearly timer)
To prevent timing inaccuracy of the real-time clock in C versions (LOGO! devices with an
integrated real-time clock) caused by this deviation, LOGO! continuously compares the timer