HEIDENHAIN MANUALplus 620 Technical Manual page 1659

8.14 Program Creation
8.14.1 ASCII editor
8.14.2 Program format
Command
January 2012
The integrated editor enables you to create and edit the PLC program and all
other necessary files right at the control through the ASCII keyboard. You will
find a complete description of the editor, including the associated soft keys, in
the User's Manual for the control.
A command is the smallest unit of a PLC program. It consists of the operation
part and the operand part.
The operation describes the function to be executed. It defines how the
operand is to be processed by the TNC. The operand shows what is to be
operated with. It consists of the operand abbreviation and a parameter
(address). With the PLC commands you can combine (gate), delete and load
register and memory contents, both with bit and word processing. For word
processing, you can address memory contents with a length of 8 bits (byte),
16 bits (word) or 32 bits (double word).
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