IMC CANSAS - Page 199

Measurement modes 199
imc CANSAS Users Manual - Doc. Version 1.9 - 05.12.2014© 2014 imc Meßsysteme GmbH
5.1.3.1.8 Missing tooth
As of imc CANSAS Version 1.6R6, a new measurement mode, Missing tooth, is available for INC4
modules (as of motherboard 2).
This mode is suited to incremental counters which have one or two missing teeth per revolution for the
purpose of angle recognition. The sensor then returns instead of 60 pulses/rev only 58. Such a sensor
connected to the INC4 indicates messy dips in the rotation speed if the missing cogs do not return any
pulse. This is avoided by means of the Missing tooth measurement mode, since this mode detects the
missing cogs and interpolates around the apparent dip.
Note
When the measurement mode Missing tooth is set for a channel, then the only measurement mode
options left for all other channels are: Velocity, Frequency, RPMs.
5.1.3.1.9 Connections
Notes on the channels:
The module comprises 4 encoders. Each encoder is connected to one channel which in turn can be
connected to the CAN-bus.
Each encoder has 2 input signals: an X and a Y-track
Each input signal is measured differentially, so it occupies 2 pins in the terminal.
Each of the 4 incremental encoder channels has an X and a Y-track for connecting a two-signal encoder.
If a one-signal encoder is used, it must be connected to the X-track and the positive Y-track must be
shorted with the negative Y-track. If the index-input isn't used, the positive index channel must be
shorted with the negative index-channel.