Opto 22 SNAP-B4 Data Sheet

BRAINS

SNAP

DIGITAL

DAT A SHEET

Form 955-050221

Description

The SNAP-B4 is a high-performance digital brain
used to connect and control up to 32 channels of
digital I/O using Opto 22’s SNAP “B Series” I/O
mounting racks and the Pamux bus. The SNAP-B4,
combined with Opto 22’s AC28 interface card and a
host PC, provides the world’s fastest digital I/O.

The SNAP-B4 communicates over a 50-pin flat
ribbon cable (Pamux bus) and can be located
up to 500 feet away from the host processor.
The Pamux bus has 64 possible addresses.
Each group of eight I/O points occupy one
address, therefore the Pamux bus can control up to
512 digital and analog I/O points. Each SNAP-B4
brain controls 32 digital I/O points and occupies
four consecutive addresses on the Pamux bus.

For additional technical information about Pamux,
please refer to Opto 22 form number 726.

page 1/6

Part Number Description

SNAP-B4 High-speed Digital Brain, Pamux Protocol

Features

PAMUX Bus
Configurable Watchdog Timer
Digital Only
Very High Speed

500 I/O Points
500 Microseconds

Cable Lengths up to 500 Feet

SNAP-B4 Digital Brain

BRAINS

SNAP

DIGITAL

DAT A SHEET

Form 955-050221

page 2/6

System Architecture

Specifications

General

Power Requirements

Operating Temperature 0° C to 70° C, 95% humidity, non-condensing

Communications Interface Pamux Bus; two 50-pin connectors

Range: (Multidrop mode) Up to 500 feet

LED Indicators SEL (address selected), WD (watchdog timeout)

Jumpers

5.0 VDC ± 0.1 VDC @ 1.0A max.
(If Term1 installed add 0.5A)

0 - 3 Address
4 - 5 Watchdog Timer Function
6 Reset Level
7 Effect of Reset on Channel 0 Watchdog