Rockwell-automation 1746-NI8 SLC 500 Analog Input Modules User Manual Bedienungsanleitung PDF herunterladen (Seite 11)

Chapter 1

Publication

17466.8 - April 1997

Overview

This chapter describes the 1746-NI8 analog input module and

explains how the SLC 500t processor gathers analog input from the

module. Included is information about:

• the module’s hardware and diagnostic features

• an overview of system operation

The module receives and stores digitally converted analog data into

its image table for retrieval by all fixed and modular SLC 500

processors. The module supports connections from any combination

of up to eight voltage or current analog sensors.

The 1746-NI8 is a multiclass (Class 1 or Class 3) single-slot module.

Class 1

➀

configuration utilizes 8 input words and 8 output words.

Class 3 configuration utilizes 16 input words and 12 output words.

Fixed and SLC 5/01t processors can only operate as Class 1. The

SLC 5/02t, SLC 5/03t, and SLC 5/04t processors can be

configured for either Class 1 or Class 3.

The 8 high-impedance input channels can be wired as either

single-ended or differential inputs. The module provides a direct

interface to the following input types:

• "10V dc

• 1–5V dc

• 0–5V dc

• 0–10V dc

• 0–20 mA

• 4–20 mA

• "20 mA

• 0–1 mA

The data presented to the processor can be configured as:

• Engineering Units

• Scaled-for-PID

• Proportional Counts (–32,768 to +32,767 range)

• Proportional Counts with User Defined Range (Class 3 only)

• 1746-NI4 Data Format

➀

Requires use of Block T

ransfer in a remote configuration.

Each input channel also provides open-circuit, out-of-range, and

invalid configuration indication via the LEDs. In Class 3 operation

these conditions are also in the channel status word.

General Description

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