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4-7 Inputting, Modifying, and Checking the Program
Once
a program is written in mnemonic code, it can be
input directly into the PC
from
a Programming Console. Mnemonic code is keyed into Program Memory
addresses from the Programming Console. Checking the program involves a
syntax
check to see that the program has been written according to syntax rules.
Once syntax errors
are
corrected, a trial execution can begin and, finally
, correc
-
tion under actual operating conditions can be made.
The
operations required to input a program are explained below
. Operations
to
modify programs that already exist in memory are also provided in this section,
as well as the procedure to obtain the current cycle time.
Before
starting to input a program, check to see whether there is a program al
-
ready
loaded. If there is a program loaded that you do not need, clear it first using
the program memory clear key sequence, then input the new program. If you
need
the previous program, be sure to check it with
the program check key se
-
quence
and correct it as required. Further debugging methods are provided in
Section 7 Program Monitoring and Execution.
4-7-1 Setting and Reading from Program Memory Address
When inputting a program for the first time, it is generally written to Program
Memory
starting from address 00000. Because this address appears when the
display is cleared, it is not necessary to specify it.
When
inputting a program starting from other than 00000 or to read
or modify a
program
that already exists in memory
, the desired address must be designated.
To
designate
an address, press CLR and then input the desired address. Lead
-
ing
zeros of the address need not be input, i.e., when specifying
an address such
as
00053 you need to enter only 53.
The contents of the designated address will
not be displayed until the down key is pressed.
Once
the down key has been pressed to display the contents of the designated
address,
the up
and down keys can be used to scroll through Program Memory
.
Each
time one of these keys is pressed, the next
or previous word in Program
Memory will be displayed.
If
Program Memory is read in RUN or MONIT
OR mode, the ON/OFF status
of
any displayed bit will also be shown.
Key Sequence
Inputting, Modifying, and Checking the Program Section 4-7
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