Mitsubishi Melsec-A Series User Manual page 10

2 SYSTEM CONFIGURATION
/MELSEC
The system can be zeroed in one of three
weys.
All use a "zeroing
dog." The "zeroing dog" is a switch
or
actuator which provides one
of two conditions which define
the home position.
The
second
condition depends on the zeroing method used, this will be one of
the following:
0
A zero phase signal from the rotary encoder.
0
A mechanical stop followed by a timer timingout.
0
A mechanical stop followed by a torque feedback signal from the
drive unit.
The operating data for the AD71 is stored in the buffer memory and
consists of parameters (defining system constants such as maximum
feedrates, etc.), zeroing data
(defining the zeroing process), posi-
tioning data (containing the individual addresses,
speeds, etc.) and
start data (defining which position to start at, etc.).
Positioning data is referred to by a positioning data number, which is
defined by
its location in the buffer memory.
There are
two methods for manual control of the AD71 pulse chain
output, these are jog operation and inching. During jog operation,
the output pulse chain is maintained for as long as
t h e
jog signal from
the PC is on however during inching a defined number of pulses is
output every time a manual pulse generator
input signal is given.
(The manual pulse generator is also referred to as "manual pulser").
The inching function therefore requires the provision of an external
manual pulse generator hard wired to the AD71 connector in order
to operate effectively.