EZD operation
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MN05013005E
119
Program
A program is a sequence of commands which the EZD
executes cyclically in RUN mode. An EZD program consists
of the necessary settings for the device, EZ-NET, COM-LINK,
password, system settings, a circuit diagram and/or function
blocks and/or the visualization screens.
The circuit diagram is that part of the program where the
contacts are connected together. In RUN mode a coil is
switched on and off in accordance with the current flow and
the coil function specified.
Function blocks
Function blocks are program elements with special functions.
Example: timing relays, time switches, arithmetic function
blocks. Function blocks are elements provided with or without
contacts and coils as required. In RUN mode the function
blocks are processed according to the circuit diagram and the
results are updated accordingly.
Examples:
Timing relay = function block with contacts and coils
Time switch = function block with contacts
Visualization screens
Visualization screens are the sections of programs containing
the display and operator functions.
Relays
Relays are switching devices which are electronically
simulated in EZD. They actuate their contacts according to
their designated function. A relay consists of a coil and at least
one contact.
Contacts
You modify the current flow with the contacts in the EZD circuit
diagram. Contacts such as make contacts carry a 1 signal
when closed and 0 when open. Every contact in the EZD
circuit diagram can be defined as either a make contact or a
break contact.
