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DP-VME-3078 48 Channel Isolated Digital Input / Output Module KEY FEATURES AND BENEFITS APPLICATIONS • 48 channel isolated digital input/interrupt Isolation in group of 4 channels •Input voltage options – 5V,12V,28V & 48V (factory settable). • 48 channel isolated digital open collector output. • 200 mA sink current • Isolation in group of 8 channels. • Two modes of digital input – edge select & state change • User programmable masks on each digital input channel • User programmable LOW true or HIGH true selection on each input. • Programmable de-bounce for digital input channels –1.024mS to 16.77S. • Free wheeling diode protection for driving relay coils. • Standard 6U VME64X Form factor with Front I/O connectors. •Drivers available – Windows 2000/XP, • RT Linux, Lynx OS. • Digital I/O interface • Status setting • Status monitoring • Automated test equipment • Checkout systems OVERVIEW INPUTS DEBOUNCED INPUT LOW TRUE AND HIGH TRUE LOGIC STATE CHANGE INPUT OUTPUT DP-VME-3078 is a 48 Channel Isolated Digital Input Output Module. This module provides 48 input / interrupt channels and 48 digital output channels with isolation. The 48 channel inputs are divided into 12 groups, each group consisting of 4 channels and 1 common GND .The 48 output channels are divided into 6 groups, each group consisting of 8 channels and a common GND. This module can be used for digital I/O interface, status setting, status monitoring, automated test equipment and checkout systems. The input channels have factory settable voltages (5V, 12V, 28V & 48V). Each input group has a programmable debounce circuit so as to enable a unique debounce period for each group. The debounce clock can be programmed from 1.024mS to 16.77S in binary steps. The inputs are processed through a debounce circuit to ensure that false transients are not recognized. Subsequent to de-bouncing,the data can be acquired in a number of modes. Capability to mask individual input channel and group interrupt is available. The interrupt status is latched and available for VME backplane reading. The debounced input data can be read on command from the host bus. Each input channel can be assigned as “LOW TRUE” or “HIGH TRUE” through software. Each input channel can generate a backplane interrupt on either “HI” to “LO” or “LO” to “HI” or state change. The LOW TRUE / HIGH TRUE polarity can be programed on a per channel basis. The state change input block continuously compares the current data with the previous data. Whenever the change occurs in the input, the changed status is indicated via an interrupt and the changed channels are recorded for reading by the host through the VME interface. The output channels are open collector output with 200 mA sink current. These output channels are provided with relay coil fly back protection and can switch up to 32V. The output channels are grouped into six groups of 8 channels each and are isolated from the backplane and from other groups. For output functions, the data is written from the host into a primary latch. Subsequently, the host can give the command to latch this data onto the secondary latches. The secondary latch value to the output lines. The latching to secondary latch can be carried out at the group level or for all 48 channels simultaneously. 32
