-64 optically coupled digital inputs

-5 V to 48 VDC input range

-High isolation, 1.000 V continuous, 7.500 V pulse voltage

-Filter input options

-Dual I/O connectors

-Contact closure sensing

-Voltage or current source input options

-Positive or negative true input options

-Dual Eurocard form factor with front panel

8-bit or 16-bit data transfer

-Unprivileged or supervisory I/O access

-Highly reliable DIN-compatible input connectors

Functional Features

Board Features:

This 64-bit optically coupled digital input board is designed and optimized for the VME bus.

The VMIVME-1150 is highly isolated and provides a flexible, low cost, high noise immunity 8-byte digital input port. The functional block diagram is shown below.

Compatibility:

The VMIVME-1150 is a standard double height printed circuit board that is electrically and mechanically compatible with the VME bus.

Input Organization:

Eight input ports, each eight bits wide. The ports are organized as eight consecutive 8-bit read-only registers.

Addressing Scheme:

Each 8-bit port is individually addressable anywhere within an 8-bit or 16-bit boundary.

Short-circuit monitoring or short-circuiting anywhere within unprivileged I/O space.

Board Address:

The board address is selected by the on-board DIP switches. Runs in any available slot on the VMEbus backplane except slot 1.

VMEbus Access:

The address modifier bits are decoded to support short supervised or unprivileged short I/O access. A jumper is provided to support this option. The board is factory configured for short supervised I/O access.

VME Bus Reply:

The DTACK reply is a response to a data select (DS0 or DS1) and the decoded board address.

Board Address.

Data Transfer Type:

D8. D16

Access Time

Maximum 250 milliseconds

Data Polarity

Sorted by positive or negative true. This depends on the input assertion of the board. To assert an input, current must flow through the LED in the optocoupler.

For positive “true” boards, this current will indicate a logic “1” to the VME bus. If the board is ordered with negative true logic, the board will display a logic zero to the VMEbus when current is flowing through the LED.

Input Characteristics

Signal Conditioning:

The input can be either a voltage or current source with a voltage range of 5 to 48 V. The input can be either a voltage or current source with a voltage range of 5 to 48 V.