Sensoray 826 Manual do Utilizador descarregar pdf (Página 7)

Chapter 2: Introduction

2.1 Overview

Model 826 is a PCI Express board that features an assortment of I/O interfaces commonly used in measurement and control

applications:

• 48 bidirectional digital I/O channels with edge detection and fail-safe output control.

• Eight 16-bit analog outputs (±10V, ±5V, 0-10V, 0-5V) with fail-safe output control.

• Sixteen 16-bit differential analog inputs (±10V, ±5V, ±2V, ±1V) with hardware and software triggering.

• Six 32-bit counters. Clock inputs may be driven from external quadrature-encoded (e.g., incremental encoder) or

single-phase sources. Inputs accept differential RS-422 or standard TTL/CMOS single-ended signals. Auxiliary inputs

and outputs can be internally routed to digital I/O channels.

• Multistage watchdog timer that can activate fail-safe outputs and generate service requests.

• Fail-safe controller switches outputs to safe states upon watchdog timeout or external trigger.

• Signal routing matrix allows software to interconnect interfaces without external wiring.

Figure 1: Model 826 block diagram

Sensoray provides a free, comprehensive API (application programming interface) to facilitate the rapid development of

polled, event-driven, or mixed-mode programs for Model 826. The API works in concert with the board's advanced

architecture to support complex, high performance applications.

Standard headers are provided for connecting on-board peripherals to external circuitry. The board's low-profile headers

allow it to fit comfortably into high-density systems, and an integral cable clamp keeps cables secure and organized.

On-board LEDs provide visual indications of the board's condition. The PWR indicator is lit when the on-board power

supplies are operating. Six LEDs are used to indicate counter clock activity as explained in Status LEDs.

826 Instruction Manual 2 Introduction

Signal

Routing Matrix

DC-to-DC

Converters

Counter

Channels

3-Stage

Watchdog

Fail-safe

Controller

DAC

Channels

Digital I/O

Interface

Analog

Mux

ADC

Controller

Timestamp

Generator

PCIe

Bridge

PCIe Bus

16 Analog In

Local Bus

8 Analog Out

6 Counter/Timer

Encoder

48 Digital I/O

Reset Out

PGA

1 2 3 4 5 6 7 8 9 10 11 12 ... 75 76

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