
1. SEQUENCE PROGRAM
CREATING PROCEDURE
B–61863E/15
PMC SEQUENCE PROGRAM
38
After deciding the control object specifications and calculating the
number of input/output signal points, create the interface specifications.
Use the input/output signal interface tables in the CONNECTION
MANUAL for the creation of the interface specifications. Enter the signal
names (within six characters) in the input/output signal interface table
according to the type of the connected signals. For the input/output
signals, see CONNECTION MANUAL.
Express the control operations decided by step 2 by use of the ladder
diagram (relay circuit diagram). For the functions of the timer, counter,
etc. which cannot be expressed with the relay symbols (i.e. the functional
instructions), express them with the symbols assigned to the functional
instructions.
In the offline programmer and built-in editing function, the sequence
program can be entered in the ladder diagram format from the keys of the
CRT/MDI panel or from the keys of the keyboard of the SYSTEM P
series.
Also, the entered sequence program can be output to the printer in the
ladder diagram format using the SYSTEM P series.
Therefore, entry can be performed while the ladder diagram is created on
the CRT screen at the time of sequence program entry. Thus no ladder
diagram may be prepared in advance.
However, in order to shorten the time occupied by the equipment for the
creation of the sequence program or to efficiently create the sequence
program, it is recommended to prepare the ladder diagram in advance.
The ladder diagram is used as a maintenance diagram by the personnel in
charge of maintenance in FANUC, the machine tool builder and end user
in the world. Therefore, the ladder diagram must be easy to understand.
Signal names (max. six characters) can be entered to the input/output
signals, comments (max. 30 characters) can be entered to the relay coil,
and comments (max. 30 characters) can be entered to the input/output
signals of the address tables at the time of entry of the sequence program.
Be sure to enter understandable signal names and comments as much as
possible.
1.4
CREATION OF
INTERFACE
SPECIFICATIONS
(STEPS 1 TO 3)
1.5
CREATION OF
LADDER DIAGRAM
(STEP 4)