Positive Limit Input

Type:	Axis Parameter Register Bit Parameter
RMC70 Address:	Fn:9/4-7, where n = 12 + the axis number
RMC150 Address:	Fn:9/8-15, where n = 24 + the axis number
System Tag:	_Axis[n].PriInputBits.PosLimIn
How to Find:	Axes Parameters Pane, All tab: Feedback
Data Type:	bits
Default Value:	0 (none)

Description

Each RMC axis allows for optional physical limit inputs to specify the boundaries in which the axis is allowed to operate. Each axis can have two physical limit inputs: Positive Limit Input and Negative Limit Input. Typically, these inputs are wired to limit switches.

The physical limit inputs differ from the Travel Limits, which limit the range of travel of an axis based on the feedback (position, pressure, etc.). The Travel Limits are required to be set on an axis; physical limit inputs are optional.

The Positive Limit Input bit parameter selects which discrete input, if any, should be used as a 'Positive Limit Input'. For details on the operation of the physical limit inputs, see the Physical Limit Inputs topic.

In RMCTools, this parameter will allow you choose an input from the drop-down box. Inputs will be listed by their address. Use the Discrete I/O Configuration editor to find the addresses of inputs.

The following options are possible:

Option	Description
none	This is the default setting.
Fault Input	RMC70: The Fault Input of the axis. RMC150: The Fault Input of the axis. Only available on the Quadrature Module.
Dedicated	Available on RMC70 QA and RMC150 Quadrature modules only. This is the PosLim input on the module.
general input	RMC70: any input from a D8 module, but only from the first 12 I/O points as listed in the I/O Monitor. RMC150: any general discrete input from any module.

Positive Limit Format Details

This section is primarily for addressing the Positive Limit Input parameter when communicating with the RMC from an external device. This information is not necessary when configuring the Positive Limit Input in RMCTools.

The Positive Limit Input is selected with bits in the Primary Input Bits register, as shown in the following table:

RMC70

Value of bits 4-7	Positive Limit Input
0	none
1	Fault Input
2	Dedicated (RegX/PosLim)
3	-
4	%IX0
5	%IX1
6	%IX2
7	%IX3
8	%IX4
9	%IX5
10	%IX6
11	%IX7
12	%IX8
13	%IX9
14	%IX10
15	%IX11

RMC150

Value of bits 8-15	Positive Limit Input
0	none
1	Fault Input
2	Dedicated (RegX/PosLim)
3	-
(32 x slot) + (i/o point) + 4	%IXslot.(i/o point)
The slot numbering starts with 0 for the left-most module in the RMC150. The I/O Monitor also displays the slot number and I/O number of each I/O point. For example, the I/O point 4 in slot 3 is displayed as 3.4. For example, input 4 in slot 0 is: (32 x 0) + (4) + 4 = 8 For example, input 7 in slot 5 is: (32 x 5) + (7) + 4 = 171

See the Primary Input Bits Register for details about the register containing the Positive Limit Input bit.