In the previous sections, the I/O signals and the parameters of the pulse output unit
(PGU)
were
explained.
This section explains how the
PGU
is controlled.
Program instructions and parameters are both entered by using the teaching panel.
The instructions come in the format "Instruction
+
Element symbol
+
Data (element number, etc.)",
"Instruction
+
Element symbol", or the instruction alone.
This section gives details about each instruction (see Section
7
for summarized definitions).
IMPORTANT
Program Operations
Instructions in the program are executed sequentially step by step. The succeeding step is not
executed until the preceding step is fully completed. Be sure that you understand the difference
between this and the cyclic operations of the programmable controller.
The program is divided into blocks. Each block can be an individual routine, and execution is selected
by either a numeric switch input or by the programmable controller.
If neither is used, block zero will be executed.
Note that some of the instructions involve waiting.
Program execution does not continue until the appropriate conditions have been met. For example,
a WAIT instruction requires a start input signal.
Others are instantaneous when the execution time is indicated.
-
-29-
To Next Page
Loading...
Need help?
General
