Program Editing
Chapter 24
24-4
If, at any time, the memory is full, a MEMORY FULL message is
displayed and you cannot enter more instructions.
Removing an Instruction
Only non-output instructions can be removed from a rung. Output
instructions can be removed only be removing the complete rung.
Remove an instruction by performing the following steps.
1.
Place the cursor on the instruction you are going to remove.
2.
Press [Remove] <instruction>.
Bit values and data of word instructions are not cleared. The input image
table bits are rewritten during the next I/O scan. If you press the wrong
instruction, and INSTRUCTIONS DO NOT MATCH message
is displayed.
Inserting a Rung
A rung can be inserted anywhere within a program. The cursor can be
positioned on any instruction of a rung. The new rung is inserted after the
rung which contains the cursor. The rung appears as an unconditional
rung. You must complete the rung. You cannot edit instructions in the
new rung until the rung is complete.
Insert a rung in a program by performing the following steps.
1.
Press [Insert][Rung].
2.
Insert <output instruction>.
3.
Insert <output address>.
4.
Press [Insert] <condition instruction>.
5.
Insert <address>.
If the cursor is on the END statement, the rung need not be inserted. You
can enter the rung as in initial program entry. if, at any time, the memory
is full, a MEMORY FULL message is displayed you cannot enter
more instructions.
