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116 T1/T1S User’s Manual
6. Programming Information

6.7 Programming language

The programming language of the T1/T 1S is ‘ladder diagram’.
Ladder diagr am is a language which composes progr am using relay symbols as a base
in an image similar to a hard-wired relay sequence. In the T1/T1S, in order to achieve an
efficient data-pr ocessing progr am , ladder diagram which are combinat ions of relay
symbols and function blocks are used.
The ladder diagram prog r am is constructed by units called ‘r ung’. A rung is defined as
one network which is connected each other.
The rung numbers are a series of numbers (decimal number) starting from 1, and cannot
be skipped. There is no limit t o the number of rungs.
The size of any one rung is limited to 11 lines ´ 12 columns.
A example of a ladder diagram program is shown below.
When X 005 is O N or t he data of D0100 is g reater than 200, Y027 com es O N.
Y027 stays ON even if X005 is O FF and the data of D0100 is 200 or less.
Y027 will come OFF when X006 comes ON.
RungRung number
1
2
3
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