User guide

Configuring an Application www.controltechniques.com 41
60.
Figure 60: Slot # View (SM-I/O Plus Module)
7.2.2.4 SM-Universal Encoder Plus Module View
If Universal Encoder Plus is selected in the Slot # Module
list box, the remainder of the view should have
configuration parameters to define what type of encoder is
being used and to define the encoder properties. The
hierarchy automatically updates to show that a
SM-Universal Encoder Plus module is populated in that
specific slot, see Figure 61.
Figure 61: Slot # View (SM-Encoder Plus Module)
7.2.2.4.1 Encoder Configuration Setup
7.2.2.4.1.1 SC.Hiperface® (Stegmann)
Encoder Setup Parameters
Encoder Supply Voltage
Because of the wide variety of encoders supported by the
Unidrive SP with the SM-Universal Encoder Plus module,
the user must have the ability to define the voltage supplied
to the encoder hardware. The available voltage levels are
5V, 8V, and 15V and are selectable from the list box on the
Encoder view.
N
ote
Be sure not to configure a supply voltage greater
than that supported by the encoder. The Unidrive
SP and SM-Universal Encoder Plus cannot protect
against possible damage to the encoder if the
supply voltage is set too high.
Enable Auto Encoder Configuration Checkbox
When a SC.Hiper, SC.EnDat, or EnDat encoder is being
used, the Unidrive SP and/or SM-Universal Encoder Plus
module can interrogate the encoder on power-up, and
acquire many of the encoder setup parameters
automatically. To enable this feature, select the Enable
Auto Encoder Configuration check box. When the
checkbox is selected (enabled) the Encoder Turns,
Encoder Comms Resolution, and Equivalent Lines Per
Revolution parameters will appear dimmed implying that
the user no longer needs to configure those parameters. If
the check box is cleared, then the user must specify the
correct values for these three parameters (Encoder Turns,
Encoder Comms Resolution, and Equivalent Lines Per
Revolution).
The aforementioned encoder parameter values are stored
in non-volatile memory (NVM) embedded in the encoder.
The values stored in NVM cannot be changed by the user.
Encoder Turns
This parameter determines the maximum number of
revolutions before the Rev Counter register (3.28 or x.04)
rolls over. If using an absolute encoder, this parameter
should be set to the maximum number of turns or lower.
The maximum number of turns is defined as follows:
Maximum # of Turns = 2
N
, where N is the Encoder Turns
parameter
The Encoder Turns box will appear dimmed when the
Enable Auto Encoder Configuration checkbox is selected
because the information will be read from the encoder.
Encoder Comms Resolution
Encoder communications is used to initially read the
absolute encoder position (SC.Hiper or SC.EnDat), the
comms resolution must be set to the maximum resolution
of the absolute position data.