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11 MANUAL CONTROL
11.1 Outline of manual control
11.1.1 Two manual control methods
"Manual control" refers to control in which positioning data is not used, and a
positioning operation is carried out in response to signal input from an external source.
The two types of this "manual control" are explained below.
(1) JOG operation
"JOG operation" is a control method in which the machine is moved by only a
movement amount (pulses are continuously transmitted while the JOG START
signal is ON). This operation is used to move the workpiece in the direction in
which the limit signal is ON, when the operation is stopped by turning the limit
signal OFF to confirm the positioning system connection and obtain the
positioning data address (refer to section "12.7.4 Teaching function").
M
(2) Manual pulse generator operation
"Manual pulse generator operation" is a control method in which positioning is
carried out in response to the No. of pulses input from a manual pulse generator
(the No. of input pulses is output). This operation is used for manual fine
adjustment, etc., when carrying out accurate positioning to obtain the positioning
address.
D75P2
Pulse input
Movement continues while
the JOG START signal is ON.
ON
OFF
JOG START signal
Fig. 11.1 JOG operation
Output pulses
M
Manual pulse generator
Fig. 11.2 Manual pulse generator control
11 - 2
MELSEC-A
Movement in response
to the command pulses
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