ISPSoft User Manual

Chapter 10 Instruction List
The operands D0 and D1 are the source device and the destination device which take part in the
transfer.
On an instruction list, the words between (* and *) are regarded as comments. When a program is
compiled, the system automatically skips the words between (* and *). Besides, as long as the
structure of an instruction list is not destroyed, comments can be put anywhere on the instruction list.
However, users have to be careful about the readability of the instruction list. The comments in the
example below are legal.
Instructions are divided into basic instructions and advanced instructions. Please refer to
programming manuals for more information about the usage of instructions. If users want to check
the usage of an instruction, they can click PLC Instruction and Special Registers Reference on
the Help menu.
Besides, if users press F1 after they click an instruction, the usage of the instruction will be
displayed in the window which appears.
10.1.2 Calling a Function Block
The important points about calling a function block on an instruction list are listed below.
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