The Basic Process Axes software option (R689) provides two TP instructions that can be used to set the speed for some or all properly set up process axes:
SET ISDT SPEED
STOP ALL ISDT
The SET ISDT SPEED instruction, when executed, sends the specified speed values as commands directly to the specified process axes motors. The units of the speed value are user units. The relationship between the “user units” used in the SET ISDT SPEED instruction and the RPM at the motor shaft is defined by the following two quantities:
The gear ratio specified in the Process Axes Setup routine at CONTROLLED start
The scale factor specified in the Process Axes Setup menu.
This relationship is defined in equation Equation 0, "" .
Equation 0.
Please see the Software Installation Manual for more information on setting the gear ratio for Process Axes, specifically the section entitled “Displaying, Modifying and Installing Process Axes.”
Please see the “Basic Process Axes” section in the “Advanced Functions” chapter of this manual for more details on how to set the scale factor in the Process Axes Setup menu.
Any properly setup process axes that are not specified in the SET ISDT SPEED instruction will not be affected by the instruction; they will continue operating at their current speed.
The syntax of the instruction is shown in figure Figure 152, "SET ISDT SPEED A...=..." .
By default, when the SET ISDT SPEED instruction is first inserted, by default it has two fields, one for the axis number and one for the speed as shown in figure Figure 152, "SET ISDT SPEED A...=..." . Additional fields may be added by pressing F1 ADD AX. This creates an additional set of axis and speed fields as shown:
1: SET ISDT SPEED A...=...,A...=...
The cursor can then be moved to any of the fields and integer data can be entered. Additional fields can be added in this way, up to a total of eight sets of axis and speed data in a single instruction.
If an axis number is specified that does not correspond to a valid, properly setup process axes, then an ISDT-012 alarm will be posted at run time.
If the same axis number is specified in multiple fields on the same instruction line, then an ISDT-013 alarm will be posted at run time.
The speed value cannot be a negative number. If negative speed is desired, either indirect (i.e. numeric register) must be used for the speed value, or a negative scale factor should be set up.