
B–61863E/15
7. LADDER DIAGRAM FORMATPMC SEQUENCE PROGRAM
377
(1) Format
The size should be A3 or A4 (JIS standard).
(2) Columns are used for wiring.
Line number
3A
3B
3P
Spindle control
(3) Divide the circuits into several functions. And program the same
function in a single program.
Example) Mode control, spindle control, turret control, APC control.
(4) Assign a line number to each line as follows:
Line symbol (A to Z)
Page number (1 to 999)
(5) Write a relay contact with a signal name of the relay coil, line number
and address.
Signal name
Address
Line number
(6) For complicated timing, timing chart should be on the same page of
the ladder diagram.
(7) The meaning of the code numbers for the S, T, and M functions
should be listed on the ladder diagram.
(8) The 1st level sequence part should be written at the beginning of the
ladder diagram.
(9) The following data should be written on the first page of the ladder
diagram:
(i) The sequence program design number
Machine tool builder shall assign design numbers of sequence
program and ROMs and manage them.
(ii) Description of symbol
(iii) Setting table of timer, counter, and PMC parameters and meaning
of them.
(iv) Description of functional instruction.
(10)Easy-to-understand name should be assigned.
7.3
LADDER DIAGRAM
FORMAT