latch_object.Signal Property

Returns the number of the digital input signal that generated a latch result.

…latch_object.Signal

Prerequisites

Requires that the Encoder Latching or Advanced Controls or Conveyor Tracking License be installed on the controller.

Parameters

None

Remarks

Latch results are created when a digital input signal changes from low to high or high to low, depending on the latching configuration.

This property returns the number of the digital input signal that triggered the latching. If the signal number is positive, the input changed from low to high. If the signal number is negative, the input changed from high to low.

The possible signal numbers are shown below.

Signal Number	Type	Description
10001 - 10002	Local hardware latching, if available.	Signals are monitored by hardware for high-accuracy latching. Position errors as low as 4µm are possible when an axis is traveling at 1 meter/second depending on sensors. If hardware signal 10001 is bi-directional (i.e. both upward and downward transitions trigger latching), signal 10002 may not be used for latching.
10001 - 10012	Local software latching. Inputs used for hardware latching may not be used for software latching.	Signals are monitored by software. Position errors as low as 1mm are possible when an axis is traveling at 1 meter/second.
10033 - 10040	ZIO board input software latching.	Signals are monitored by software. Position errors as low as 4mm are possible when an axis is traveling at 1 meter/second.
n10001 - n10002	Remote hardware latching, if available, for Ethernet servo network node n.	Signals are monitored by hardware on remote servo boards in the Ethernet servo network. Position errors as low as 20µm are possible when an axis is traveling at 1 meter/second. If hardware signal n10001 is bi-directional (i.e. both upward and downward transitions trigger latching), signal n10002 may not be used for latching.
n10001 - n10012	Remote software latching for Ethernet servo network node n.	Signals are monitored by software. Position errors as low as 1mm are possible when an axis is traveling at 1 meter/second.
n10001 - n10003 n10001 - n10008	Remote software latching for Serial servo network node n. (GSB or GIO).	Signals are monitored by software at 16KHz. Position errors as low as 62.5µm are possible when an axis is traveling at 1 meter/second.

Examples

Dim lat As Latch
lat = Latch.Result(1)
Console.WriteLine("Signal: " & CStr(lat.Signal))