Motor command polarity
For each axis, the motor cve pin will go negative with respect to the command common line to produce a positive change of
position.
The motor command -ve pin will go positive at the same time.
Brakes
The brake on a CMM is a mechanism to prevent that axis from moving when it is already stationary, it is not there to slow an axis down.
These outputs are used to disengage the CMM axis brakes (if fitted). The output becomes active as soon as the CMM servos are engaged.
It is possible to set delays for the release and application of the brakes. These delays are applied equally to all of the brake outputs.
Release delay is the time between de-activating the brake outputs and allowing motion requests occurring during engagement.
Apply delay is the time between servo disengagement and activating the brake outputs.
Air solenoid
This output signal is used to activate the CMM main air supply solenoid (if fitted). The output becomes active as soon as a downloadable is
sent to the UCC2 controller. If the controller is reset or switched off the air solenoid will be de-energised disconnecting the CMM air supply .
Switched outputs
The UCC2 has the following uncommitted switched outputs, please refer to
for details.
There are seven uncommitted outputs available on the UCC2 I/O connector, pins 6 to 12 are allocated to be outputs 0 to 6 consecutively. The
UCC does not directly control these outputs, it merely acts as a post-box. These outputs are controlled from the application software package
via command 318 “Write to controller port”.
These switched outputs are pulled up to the 24 V rail by a 20 k ohm resistor when inactive, and will be pulled down to the 24 V return line via
an NPN transistor when activated. There is an excess voltage protective diode fitted internally to the controller.
The outputs can be activated by a command from the main computer to the controller. If not being used they should be left open circuit.
Switched inputs
The UCC2 has the following controller switch inputs, please refer to
There are six uncommitted inputs available on the UCC2 I/O connector, pins 13 to 18 are allocated to be inputs 0 to 5 consecutively. The UCC
does not directly read these inputs, it merely acts as a post-box. These inputs are read by the application software package via command 279
“Read from controller ports”.
The controller provides 29 inputs of this type. See
Each input is connected to an LED fed from the +24 V rail, and is activated by being pulled down to the 24 V return line. The LED is part of an
opto-coupler which is used to give the controller some isolation from unwanted electrical signals on the input wiring.
UCC2 and UCC2-2 installation guide
www.renishaw.com
Issued 07 2021
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