7 – 46 HEIDENHAIN Technical Manual TNC 426, TNC 430
7.5 Program Creation
7.5.1 ASCII Editor
With the integrated editor you can create the PLC program and all other
necessary files right at the control through the ASCII keyboard. You will find a
comprehensive description of the editor including its soft keys in the User’s
Manual of the control.
7.5.2 Program Format
Command 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 says 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). When you enter a command, the TNC immediately
checks it for the correct syntax and, if necessary, displays an error message.
See “Error Messages” on page 10 – 3
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