Quadrature Configuration

The RMC supports a wide range of quadrature encoders and homing configurations. To select the type of the quadrature encoder and the polarity of the drive output, the following settings can be changed:

Active state of the Index (Z), Home (H), Fault, and Limit inputs. This is set in the Configuration word. See the Quadrature Specific Configuration help topic for details.
How the Home status bit is used. This is set in the Configuration word. See the Quadrature Specific Configuration help topic for details.
How the Encoder Error/Fault Input status bit is used. Setting this bit is described below.
Support for reversing the drive output in software. This is set in the Configuration word. See that topic for details.

No jumpers are required for changing any of these settings. You need to set the Configuration word parameter for each axis used.

Defining the Encoder Error/Fault Input Status Bit

This status bit can represent either an encoder error or a fault error. The user configures which of these two conditions is reported in this status bit. There are four options:

Encoder Error only. This bit will go high if the encoder circuitry detects an error, which is defined as an invalid transition of the A and B lines. This usually occurs due to over-speed or noise conditions.
Fault Input only. This bit will go high if the Fault input goes active. The fault input is intended to be a means for the drive amplifier to let the RMC know that it no longer has control. If the fault input is not used, it should be made inactive by wiring or by reversing the polarity in the Configuration Word parameter.
Encoder Error or Fault Input (default). This bit will go high if either of these conditions occurs. This is the default behavior for QUAD and STEP axes, but it is ambiguous whether the error was triggered due to an encoder error or the Fault input.
Unused. This bit will always be low.

The use of this bit can be set only from RMCWin. Use the following steps:

On the Tools menu, click Module Configuration.
In the Slots list, click the Quadrature module you want to edit.
Click Slot options. The Quadrature with Analog Output Options dialog box will be displayed with a tab for each axis on that slot.
Click the Axis 0 tab.
Check the conditions that you want to have set this status bit. You can check one, both, or neither condition.
Click the Axis 1 tab.
Check the conditions that you want to have set this status bit. You can check one, both, or neither condition.
Click Update RMC.
The Update Module Configuration dialog box will be displayed to indicate the progress. If the module could not be reset automatically, you may be prompted to reset the module yourself.