All input pins
The inputs are activated by being pulled down to 0 V. They are not opto isolated and are pulled up to +24 V by a 10 kΩ resistor within the
UCC MMI-2. These inputs can accept signal levels in the range of +5 V to +24 V, and need to be pulled below 1.5 V to signify the active state.
The input pin must be driven above 4.2 V, or left open circuit, to signify the inactive state.
WARNING:
The input pins must not be driven above External I/O +24 V.
All output pins
The open drain output with a 10 kΩ pull‐up resistor to external I/O +24 V is suitable for driving devices in the range +5 V to +24 V and can
sink a maximum current of 200 mA. If the output is not required, then it should be left as an open circuit.
WARNING:
The output pins are not suitable for direct connection to circuits operating above External I/O +24 V.
External I/O +24 V
External I/O +24 Vdc supply is provided for use with the I/O equipment. Maximum current 1 A (1000 mA).
NOTE:
All I/O peripherals should typically be supplied from the +24 V I/O pin, however if supplied externally, the voltage must be
in the range 0 V to 24 V and the current must not exceed 200 mA.
UCC MMI-2 installation guide
www.renishaw.com
Issued 08 2020
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