Kontron CP384 - Manual (Page 35)

ID 31440, Rev. 01 Kontron Modular Computers GmbH
P R E L I M I N A R Y
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Functional Description CP384
2.3 Digital Input Signal Conditioning
The digital input signal conditioning consists of the following:
• Overvoltage protection
• Low-pass signal filtering
• Current limitation
• Inverse polarity protection
• Input signal high-low determination
• Output signal stabilization buffering
2.4 Digital Output Signal Conditioning
The major element of the digital output signal conditioning is the 2 Form C relay which is able
to switch inductive, capacitive or resistive loads. The 2 Form C relays are double pole, double
throw relays with a common single coil where one set of three contacts (COM, NC, NO) are
available to the application and the other set of three contacts is reserved.
For proper operation the relay requires a minimum coil supply voltage of 18V. The voltage su-
pervisor monitors the input supply voltage to the coil for under/over voltage condition, and, if
detected, switches the coil input suppy off. Under voltage cutoff is 18,6V with 0,3V of hystere-
sis. Overvoltage cutoff is 29,7V with a histeresis of 0,4V. Within the range of 19,2V to 28,8V
proper operation is guaranteed.
The digital output relays are driven by the DIO ProComm Controller via optocoupler devices.
2.5 Optoisolation
The process side is galvanically isolated from the system side. The process side of the board
is separated from the system side by a bank of optocouplers which serve to protect the system
side from any excess voltages or voltage spikes.
2.6 DIO ProComm Controller
The DIO ProComm Controller is responsible for supervising and controlling the digital acquisi-
tion and the digital data output process, and maintaining communication with the CompactPCI
System Master. Applications address the CP384 through its software driver interface within the
System Master whereby the controller accepts requests from the driver and executes them ac-
cordingly. Digital data from the signal conditioning is processed through the DIO ProComm
Controller and then made available to the System Master. Digital data from the System Master
is processed through the DIO ProComm Controller and then routed to the relay drivers.
2.7 System Interfaces
The CP384 provides interfacing capability for the following system elements:
• Front panel connector
• CompactPCI bus
Digital inputs, digital outputs, external voltage, and external reset are routed via the CON2 con-
nector. Interfacing to the CompactPCI bus is accomplished via the CON1 connector. Test and
program development is supported by the CON3 connector.