Operational Theory Xenus XSL User Guide
44 Copley Controls Corp.
2.14: Outputs
2.14.1: Digital Outputs
The amplifier has four programmable digital outputs. Three of the outputs (OUT1 - 3) are general-
purpose outputs. The fourth (OUT4) is specifically designed as a brake output but can be
programmed to perform any of the functions.
The general-purpose outputs are open-drain MOSFETs, each with a pull-up resistor, in series with
a diode, connected to the amplifier’s internal +5 Vdc supply. This design allows the outputs to be
directly connected to optically isolated PLC inputs that reference a voltage higher than
+5 Vdc, typically +24 Vdc. The diode prevents current flow between the +24 Vdc supply and the
internal +5 Vdc supply though the pull-up resistor. This current, if allowed to flow, could turn on the
PLC input, giving a false indication of the amplifier’s true output state.
The general-purpose outputs require an external fly-back diode to be installed across any
inductive loads, such as relays, that are connected to them.
The brake output (OUT4) is described in Brake Operation (p. 33).
2.14.2: Standard Programmable Output Functions
Each digital output can be programmed to perform one of the following standard functions.
Function Description
Fault – Active High (Low) The output is high (low) when a fault is active.
Brake – Active High (Low) The output high (low) when brake is active.
PWM Sync Output (Only available on OUT1.) Sends the PWM sync input of a slave amplifier.
See Synchronizing PWM Switching Frequency (p. 18).
Custom – Active High (Low) The output is high (low) when at least one of the events selected on the Custom
Output Configuration form occurs.
For more information, see Custom Output Functions (p. 45).
Program Control – Active High
(Low)
The state of the output is controlled by the CAN controller or the CVM control
program.
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