FX Series Programmable Controllers Points Of Technique 10
10-11
Zero Return Mode
This mode fulfills an initialization function b
returnin
the robot arm to a known position.
Once 'Z Return' has been selected from the
mode selection screen the bit device M35 is
ON. At this point the DU screen chan
es to the
'zero return' screen.
The actual zero return operation will then start
when the 'Return' push button is pressed
(activatin
M25) and the robots
rip is not
active, i.e. Y1 is OFF (on the STL flow dia
ram
opposite Y1 OFF is shown as Y1*).
The DU unit could be used to report back the
status of the current returnin
operation. The
example screen shown opposite uses 3 variable
messa
es to indicate this status. The messa
es
could be text strin
s stored in the PLC which
are read and displa
ed b
the DUs ASCII
option.
Once the zero point has been returned to, the operator would also return to the mode selection
screen. This is achieved b
pressin
the 'Menu' touch ke
. This then resets the zero return bit
device M31 which allows the DU screen chan
e to take place.
Ke
assi
nment for DU screen above:
Return = M25
Menu = reset M31
Automatic Mode
Under this option there are three further mode selections. The available modes are:
Step Mode:
- The automatic pro
ram is stepped throu
h - operation b
operation, on command b
the
user pressin
the 'Start' button.
C
cle Mode:
- The automatic pro
ram is processed for one complete operational c
cle. Each c
cle is
initiated b
pressin
the 'Start' button. If the 'Stop' button is pressed, the pro
ram is
stopped immediatel
. To resume the c
cle, the 'Start' button is pressed a
ain.
Automatic Mode:
-A full
automatic, continuousl
c
clin
mode. The modes operation can be stopped b
pressin
the 'stop' button. However, this will onl
take effect after completion of the
current c
cle.
Zero Return Mode
AB
Menu
Return
Status:
Now returning
At Zero point
Cannot return
Zero point
Additional user
messages
