Inovance H3U Series - Page 564

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8
8 Electronic Cam
Chapter 8 Electronic Cam
Two models of H3U PLCs are available: common H3U PLC and H3U-PM motion control PLC. The H3U-PM motion
control PLC model has 3-axes electronic cams and hand gears (also called electronic gears). The following gure
shows the structure of the 3-axes electronic cam module of an H3U-PM motion control PLC:
X axis electronic cam
module
Y axis electronic cam
module
Z axis electronic cam
module
X axis output
control
Internally virtualized
master axis
External
master
axis
selection
A
B
A
B
A
B
X axis
Y axis
Z axis
Electronic
cam
output
H3U-0808PMRTA
Externally input
master axis
The 3-axes electronic cam module supports electronic cam table following or electronic gears. A master axis can
be externally input or internally virtualized. The X, Y, or Z axis can be input at a high speed as a master axis of the
electronic cam module. The X axis is internally virtualized as a master axis. Therefore, only the Y and Z axes can
use the internally virtualized axis.
Electronic cam modules based on the three axes share the same basic functions. With an example of the Y axis,
the following gure shows the basic structure of a single-axis electronic cam module.
Internally virtualized
master axis
Externally input
master axis
Master
axis
selection
SM171
Setting
cyclic/non-
cyclic
execution
SM173
Startup mode setting
SM170
Hardware disabling
SM174
Enabling
startup
latency
SM175
Start
Stop
Gear ratio
SD144/SD45
Master axis
input
Cam table 1
Cam table 2
Cam table 3
Cam table/electronic
gear selection
SD170
Electronic gear
Electronic
cam/gear input
control
FP
RP
Cam enabling
SM178
Setting stop
mode
SM181
H3U-0808PMRTA
External
master
axis
selection
SD171
X axis
output
control
Slave axis zoom
ratio
SD173/100
Event trigger mode setting
SM160
Operations of electronic cams:
①
Establishing a cam table
②
Selecting a master axis
③
Setting cyclic or non-cyclic execution
④
Starting electronic cams
⑤
Stopping electronic cams
⑥
Dynamically modifying electronic cam data