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5-3. INDEX DRIVE Function
Accelerating/decelerating drive is performed with the specified number of pulses by the INCREMENTAL INDEX
command. (or up to the target address by ABSOLUTE INDEX command).
Example of X axis:
Hz
HSPD
Specified number
of pulses
(target address)
LSPD
URATE
DRATE
t
・When +(CW)direction is specified
XCWP
XCCWP
・When -(CCW)direction is specified
XCWP
XCCWP
The data required for INDEX DRIVE is as follows.
Data name
Setting command
-----------------------------------------------------------------------------------------------
HSPD (HIGH SPEED)
HSPD SET
LSPD (LOW SPEED)
LSPD SET
URATE (acceleration time constant)
RATE SET
DRATE (deceleration time constant)
RATE SET
Specified number of pulses (target address)
When INDEX DRIVE is started
Note1: When LSPD≧HSPD is specified, constant-speed drive is performed with HSPD.
Note2: When LSPD<HSPD and URATE≠DRATE are specified, the timing up to a pulse output is different from
that of URATE=DRATE. For details refer to Chapter 12. Timing.
For this reason, please use the same data unless specially required.
5-4. Drive Speed Change Function
Using the SPEED CHANGE command allows you to change speed of the SCAN or INDEX DRIVE currently taking place
(note that this command is valid only for these two drive types).
The drive is accelerated or decelerated to the speed specified by the SPEED CHANGE Command.
Note1: This speed change is not available when the INDEX DRIVE is taking place at URATE≠DRATE.
Note2: Speed change is available within the range of LSPD<Change speed<HSPD.
Note3: When the SPEED CHANGE Command has been executed, you must wait until the command is internally
accepted before requesting another speed change using this command.
Check the SPEED CHANGE BUSY BIT
in the STATUS5 PORT to make sure that the SPEED CHANGE Command is executable.
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