GE VMIVME-3113A Analog-Digital Converter Board with Built-in Tests

Function

64 differential or single-ended inputs

Starts in auto-scan mode - no software initialization required

Continuously digitizes input channels and stores results in dedicated channel dual-port registers (auto-scan mode)

Jumper-selectable scan from 2 to 64 channels

Supports real-time and off-line built-in testing

Five operating and test modes

-Auto Scan Mode (Gain = 1)

- Random polling mode

-Random interrupt mode

-Scan polling mode

-Scan interrupt mode

VME bus interrupts can be programmed to interrupt at the completion of a single A/D conversion or at the completion of a 2- to 64-channel sweep

User programmable interval timer supports periodic scanning of all channels

Jumper programmable gains of 1. 10. 100. 200. and 500

Selectable A/D ranges of 0 to +10V, +5V and +10V

Low and high inputs: +10my to +10V

Selectable low-pass filter (VMlVME-3113A for better high-frequency rejection)

Overvoltage protection input

5 x 1060 input impedance

33 kHz conversion rate

Selectable output codes: binary, offset binary, binary with sign extension

Applications

-Factory automation and instrumentation - Process control

-Laboratory instrumentation

-Machine monitoring

- Data acquisition

Features

Description: This product is designed to support 64 channels of differential or single-ended wide range (±10mV to ±10V) analog inputs.

The board supports the following modes of operation:

Auto Scan

Random Polling

Random Interrupt

Scan Polling

Scan Interrupt

Auto Scan with BIT

The 64-word dual port provides storage for continuous scanning of all channels. Scan patterns can be performed automatically at power-up, system reset, or entered under program control.

Dual port registers allow access to the VMEbus at any time to read the latest stored data.

Jumper-selectable programmable gain amplifiers support gain ranges of 1. 10. 100. 200. and 500. A/D conversion time is 15 µs. Multiple low-pass filters are supported.

Operation Modes

Auto Scan Mode: This mode is executed via power-up system reset or program selection. All channels are scanned continuously and digitized data is stored in 64- and 16-bit dual-port registers.

No additional programming is required to initiate the A/D conversion process. The user simply reads the digitized data from the dual-port register of the desired channel. This mode is only available with a gain of 1 and at least 16 connected channels.

16 connected channels.

Random Polling Mode: This mode requires the control program to generate a conversion. The end of the conversion is determined by polling the end-of-conversion status bit.

Random Interrupt Mode: This mode is the same as Random Polling Mode, but an interrupt is issued to the CPU board at the end of the conversion.

Scan Polling Mode: This is a scanning mode that performs a scan of all channels. The end-of-scan control bit is polled to determine when the scan is complete.

Scan Interrupt Mode: This is a scan mode that performs a single scan of all channels and generates an end-of-scan interrupt at the end of the scan.

Auto Scan Bit Mode: All channels are scanned continuously and channel 0 is multiplexed in one of three exact reference voltages. The voltages are 4.980. 0.4928. and .009915V.

Programmable Interval Timer: 16-bit triple timer (cascadable to 48-bit) can be programmed to generate a periodic trigger to initiate an A/D scan.

External Trigger: Scan can be initiated using a user connected signal. Board Components