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Introduction to programming software
Ladder language
The M3 SOFT CD-ROM contains all the symbols used in Ladder language. You can choose
between two types of graphic representation: Ladder or electrical symbols.
■
■
13 Ladder functions
Inputs
■
Electrical
symbols
DIGITAL INPUTS
This contact represents
the state of the controller
input connected to a
sensor (pushbutton, switch,
detector, etc).
A/B BUTTONS
The A and B buttons
behave exactly like physical
inputs. They correspond to
the grey A and B buttons on
the front of the controller.
SUMMER WINTER
This function output is in the
OFF state for the whole of
wintertime and changes to
the ON state for the whole of
summertime.
■
Outputs
DIGITAL OUTPUTS
AUXILIARY RELAYS
■
Ladder symbols
The digital outputs
correspond to the
controller output relay
The auxiliary relays, marked M, behave exactly like digital outputs,
but do not have an output electrical contact. They can be used as
internal variables.
coils (connected to
the actuators).
■
Timer/clock
TIMERS
The TIMERS function block provides access to the following
functions: delaying or prolonging actions for a prede?ned time,
management of ?ashing cycles, creating pulses, etc.
CLOCKS
The Clocks or Time Prog
function is used to enable
time slots during which it
will be possible to execute
■
Counter
actions.
■
COUNTERS
Upcounts or downcounts
pulses.
Display
HIGH-SPEED COUNTER
Counts pulses up to a
frequency of 1 kHz.
COUNTER COMPARATORS
Compares the current
counter value of two
counters or of one counter
and a constant value.
LCD BACKLIGHTING
The screen Backlighting
output is used to control
the LCD display lighting
via the program.
TEXT BLOCKS
The Text automation function is used to display text and/or
numerical values (current value, preset value, etc.) on the LCD
display rather than on the INPUTS-OUTPUTS screen.
■
Communication
“
MESSAGE
When activated, the Message function block can be used to:
? send alarm messages to mobile phones, to the M3 Alarm tool or
to e-mail addresses via the M3MOD communication interface.
? provide remote access to a digital variable and/or a numerical
variable, in order to read or modify them.
I wasn’t really into programming at ?rst. Here at least,
I can choose the language that suits
me best . As I am an electrical engineer by training,
with Ladder language, it’s what I understand!
Olivier, Electrical Installer
www.millenium3.crouzet.com
”
19
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