GE VMIVME-3113A_Scan motherboard

Introduction 

The VMIVME-3113A 64-Channel Scanning, 12-bit Analog-to-Digital Converter (ADC) is one of the highest 

density/lowest cost per channel boards in the industry. 

In addition, it contains many features found only on more expensive products. 

The AUTOSCANNING MODE, which is automatically entered on power up, performs Analog-to-Digital (A/D) conversions 

on all inputs and stores them in a dedicated channel dual-port register. 

This allows the user to operate the board without any programming. 

The user simply reads the data from the dual-port registers which always contain the latest converted data for that particular channel. 

There are five other ADC operating modes which allow greater flexibility in controlling the ADC operation. 

The VMIVME-3113A Board is useful for many applications which require a large number of differential inputs to be converted to digital form. 

Overvoltage protected inputs, input filters, programmable timers and jumper-programmable gain features 

lend the board to such applications as factory automation and instrumentation, process control, 

laboratory instrumentation and general data acquisition systems.

A Built-in-Test (BIT) mode permits verification of the input multiplexer and A/D converter.

Features

The following brief overview of principal features illustrates the flexibility and

performance that is available with the VMIVME-3113A Board:

• 64 differential or single-ended inputs

• Powers up in AUTOSCANNING MODE - no software initialization required

• Continually digitizes all input channels and stores the results in a dedicated

channel dual-port register (AUTOSCANNING MODE)

• Six operating modes

— AUTOSCANNING MODE *

— RANDOM POLL MODE

— RANDOM INTERRUPT MODE

— SCANNING POLL MODE

— SCANNING INTERRUPT MODE

— AUTOSCANNING MODE with BIT

* Only for gain = 1 and a minimum of 16 channels.

• VMEbus interrupts may be programmed to interrupt upon completion of a

single A/D conversion, or upon completion of a 16 through 64-channel scan

(see “Analog-to-Digital (ADC) Control and Timing” on page 26)

• User-programmable interval timer supports scanning of all channels at periodic intervals

• Jumper-programmable gains of 1, 10, 100, 200 and 500

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

• Low-level and high-level inputs: ±10mV to ±10V

• Optional low pass filter

• Overvoltage protected inputs

• 5 x 106

Ω input impedance differential and 2x106

Ω input impedance

single-ended

• 33 kHz conversion rate at GAIN<500 (23kHz for GAIN = 500)

• Selectable output code: binary, offset binary, two's complement with sign extension

• Front panel Fail LED is under program control and may be used for any purpose

• Board ID register

System Configurations

The Mini Converter can be used in a point-to-point configuration as described above, 

or in a multidrop configuration with the host device configured as the master and one or more programmable controllers configured as slaves.

The multidrop configuration requires a straightthrough (1-to-1) cable from the Mini Converter’s RS-422 port to the first slave PLC’s SNP port.

Other slaves will require a daisy chain connection between slaves. 

A maximum of eight devices can be connected in an RS-422 multidrop configuration.

All of the devices must have a common ground. 

If ground isolation is required, you can use the Isolated Repeater/Converter (IC655CCM590) in place of the Mini Converter.

When using the Mini Converter with a modem connection, 

it may be necessary to jumper RTS to CTS (consult the user’s manual for your modem).

Cable Diagrams (Point-To-Point) When connecting the Mini Converter to IBM PC and compatible computers with hardware handshaking,

the following cable connections should be used.