Time Constant (Simulator)

Type:	Axis Parameter Register
Address:	RMC75: %MDn:118, where n = 12 + the axis number RMC150: %MDn:118, where n = 24 + the axis number RMC200: %MDn:484, where n = 384 + the axis number
System Tag:	_Axis[n].TimeConstant, where n is the axis number
How to Find:	Axes Parameters Pane, All tab: Simulate
Data Type:	REAL
Units:	s
Range:	See the Range section below.
Default Value:	0.75

Description

This parameter is used for the motion simulator in the RMC. For details on using simulate mode, see the Simulate Mode topic.

The Time Constant is used with a 1st order simulator.

Range

The Time Constant must be greater than or equal to the control loop time:

Control Loop Time	Minimum Time Constant
0.125 ms	0.000125 s
0.25 ms	0.00025 s
0.5 ms	0.0005 s
1.0 ms	0.001 s
2.0 ms	0.002 s
4.0 ms	0.004 s

Changing this Parameter

For best results, always change this parameter only from Axis Tools. If the axis is in Simulate mode, and this parameter is changed, simulate model will be suspended until the last simulate mode parameter register (Max Compression) has been updated. At this point, the new simulator model will be calculated and the simulator model will be activated. When the simulator model is suspended, the Actual Position will not move.

Certain simulator settings may result in an invalid model. If this occurs, change your settings. See the Simulating Motion topic for more details.