Mitsubishi Electric MELSEC-L LD75P User Manual page 773

Term
G CODE
JOG
k pulse/s
M CODE (Machine Code)
NC LANGUAGE (Numerical Control
Language)
PG0 (Pulse Generator Zero)
PTP Control (Point To Point Control)
P RATE (Pulse Rate)
READY
RLS SIGNAL (reverse limit signal)
SFC (Sequential Function Chart)
STOP SIGNAL
These are standardized (coded) 2-digit numerical values (00 to 99) designating various control functions of the
NC module. Also called G functions.
Example:
• G01 Linear interpolation
• G02 Circular interpolation CW (clockwise)
• G04 Dwell
• G28 OPR
• G50 Max. spindle speed setting
Jog. This refers to moving the tool little by little. Inching.
Parameter setting is required to carry out JOG operation.
Kilopulses per second.
80kpulse/s equals 80,000 pulses per second.
These are sub functions that interlock with the positioning operation to replace drills, tighten and loosen clamps,
raise and lower welding electrodes, display various data, etc.
Either of two modes can be entered when the machine code turns ON: AFTER or WITH.
The machine does not move to the next positioning when the machine code is ON. M codes are turned OFF by
the program.
Code Nos. from 1 to 65535 assigned by the user and used (1: Clamp, 2: Loosen, etc.). Comments can be written
after 50 of the M codes, and they can be monitored using GX Works2 or displayed on an external display.
Refer to the term "AFTER MODE".
Refer to the term "WITH MODE".
This is the language punched into the paper tape that instructs the machining to the NC module.
The NC language consists of EIA codes (EIA language), ISO codes (ISO standards), and JIS codes (JIS
standards).
Pronounced "pee-jee-zero". Refer to the term "ZERO SIGNAL".
1 axis rotation
This is a type of positioning control.
With this control method, the points to be passed are designated at random locations on the path.
Movement only to a given target positioning is requested. Path control is not required during movement from a
given point to the next value.
A coefficient that magnifies the feedback pulses per motor shaft rotation by 2-fold, 3-fold, 1/2 or 1/3.
It is the ratio of the feed pulses and feedback pulses.
For example, when the No. of pulses per motor shaft rotation is set to 2400 pulses, and the P rate is set to 2, the
result will be equivalent to 1200 pulses. The rotation per pulse is 0.15 when 2400 pulses per rotation are set, but
this becomes 0.3 when 1200 pulses. The positioning accuracy drops as the P rate is increased.
This means that preparation is complete.
This is the input signal that notifies the user that the limit switch (b contact configuration, normally ON) installed at
the lower limit of the positioning control enabled range is activated.
The positioning operation stops when the RLS signal turns OFF (non-continuity).
A sequential function chart is a programming method optimally structured for running a machine's automatic
control in sequence with the programmable controller.
Start preparation
Start preparations OK
Execution of advance
operation servo program
Positioning complete
Execution of extrusion
operation servo program
Positioning complete
Execution of retract
operation servo program
Positioning complete
In positioning control, this is the input signal that directly stops the operation from an external source.
The operation stops when the external stop signal (a-contact) turns ON (continuity).
Description
Feedback pulses
PG0
APPENDICES
A
771