Pixsys PL260, Руководство пользователя

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2 PL260 Ladder programming
2.1 Introduction
The software tool "PLProg" for Windows allows programming the module
PL260. The ladder programming enables drawing the logic diagram of the
application and uploading it to the PLC.
2.2 Elements of Ladder programming
Available elements with relevant features, to create the ladder diagram, are
listed below.
2.2.1 Contacts digital inputs I
Contacts I contains the state of digital inputs of PL260 and of one more
expansion module. The N.O. contact is closed (on) when bit value is 1
(active input). The N.C. contact is open (on) when bit value is 0 (input not
active).
2.2.2 Digital outputs Q
PL260 is provided with 256 outputs type “Q”, each composed of one coil
and the relevant logic contact N.O. and N.C. which may be used to draw
the ladder diagram. On PL260 hardware only 16 static outputs Q are
physically available, the other ones are available as auxiliary outputs or on
expansion module (if present).
Energizing coil “Q” , the relevant logic contact will close (N.O.) or open
(N.C.). The contacts of physical outputs are all N.O. and at starting all
contacts N.O. are open.