Pixsys TD320, Руководство пользователя

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7 Ladder programming of the TD320
Programming the PLC part of the TD320 is accomplished with the
development environment
PLProg 4.xx
, which provides the user
with all the resources necessary for creation of the Ladder
diagram.
The compilation and download procedure discussed in chapter 4
allows the TD320 terminal to achieve the desired functionality.
The following describes all available elements (contacts and coils)
and the relative characteristics for the creation of the diagram.
7.1 Digital input contacts I
Digital input contacts I can contain the state of the inputs read via
serial lines of other devices, up to a maximum of 512.
A contact normally open (N.O.) is closed (ON) when the bit value
is “1” (input active). A contact normally closed (N.C.) is opened
(ON) when the bit value is “0” (input non-active).
7.2 Digital output contacts Q
The TD320 has 512 type “Q” outputs. These can be used to
contain the state of eventual outputs of other devices,
communicated by serial lines.
Each output has a coil and a related logical contact N.O. (normally
open) or N.C. (normally closed). At activation of the coil “Q”, the
related logical contact will close (if normally open) or will open (if
normally closed).
7.3 Bistable relay B
There are 128 bistable relays available in the TD320. Each has a
coil and related logical contact normally open or closed (N.O/N.C).
At activation of coil “B”, the related logical contact will change
state, if it was closed it will open, if it was open it will close. A
contact N.O. is closed (ON) when the bit value is “1”. A contact