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8 Electronic Cam 8.2 Selecting a Master Axis
8.2 Selecting a Master Axis
Signals of a master axis are needed to enable electronic cams or gears. The signals can be generated through
external input or internal virtual connection.
The following table lists special elements for master axis selection.
SM Element for Master Axis Selection SD Element for Master Axis Selection
X axis Y axis Z axis X axis Y axis Z axis
SM71 SM171 SM271 SD71 SD171 SD271
OFF: Internal virtual connection 1: Internal connection to X output axis
ON: External input
1: X input channel
2: Y input channel
3: Z input channel
If internal virtual connection is selected, the X output axis will be virtually controlled, and the master axis will be
internally virtualized for an electronic cam or gear without external connection. When the X axis serves as a slave
axis of an electronic cam, internal virtual connection is unavailable.
If external input is selected, based on values of SD elements, you can select X, Y, or Z input channel as the
master axis. If signals of a master axis are externally input, modes of external input (SD60, SD160, and SD260)
must match input signals.
8.3 Setting Cyclic or Non-cyclic Execution
You can use special SM or SD elements to set cyclic or non-cyclic execution for electronic cams.
The following table lists special elements for setting cyclic or non-cyclic execution.
SM for Setting Cyclic or Non-cyclic Execution SD for Setting Number of Cycles
X axis Y axis Z axis X axis Y axis Z axis
SM73 SM173 SM273 SD72 SD172 SD272
OFF: Non-cyclic execution
You can set a maximum of 255 cycles for non-
cyclic execution.
ON: Cyclic execution N/A
Cyclic execution: The electronic cam cyclically executes relationships set in the electronic cam table until it
receives the command to stop.
Non-cyclic execution: The electronic cam automatically stops after a specied cycles of execution. SD elements
(SD72, SD172, and SD272) can be used to set the number of cycles (maximum: 255) for non-cyclic execution.
… …
Electronic cam
enabling
Slave axis running
Cyclic electronic
cam
Non-cyclic
electronic cam
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