Rockwell Automation Allen-Bradley DeviceNet Base RTD Bedienungsanleitung

Installation Instructions

DeviceNet Base RTD and

Thermocouple CompactBlock LDX I/O

Catalog Numbers 1790D-4R0, 1790D-4T0, 1790D-T4R0,

1790D-T4T0

Table of Contents

Topic Page

Important User Information 2

Environment and Enclosure 3

Prevent Electrostatic Discharge 3

North American Hazardous Location Approval 4

EDS File Requirements 4

Install the CompactBlock LDX I/O 5

Set the Node Address on the Base Block 5

Mount the Base Module 6

Wire the Terminal Block 8

Connect Field Wiring 9

Connect the DeviceNet Cable 13

I/O Memory Mapping 14

Interpret the Status Indicators 15

Specifications 16

2 DeviceNet Base RTD and Thermocouple CompactBlock LDX I/O

Publication 1790-IN011C-EN-P - January 2015

Important User Information

Solid-state equipment has operational characteristics differing from those of electromechanical

equipment. Safety Guidelines for the Application, Installation and Maintenance of Solid State Controls

(Publication SGI-1.1 available from your local Rockwell Automation sales office or online at

http://www.rockwellautomation.com/literature/) describes some important differences between

solid-state equipment and hard-wired electromechanical devices. Because of this difference, and also

because of the wide variety of uses for solid-state equipment, all persons responsible for applying this

equipment must satisfy themselves that each intended application of this equipment is acceptable.

In no event will Rockwell Automation, Inc. be responsible or liable for indirect or consequential damages

resulting from the use or application of this equipment.

The examples and diagrams in this manual are included solely for illustrative purposes. Because of the

many variables and requirements associated with any particular installation, Rockwell Automation, Inc.

cannot assume responsibility or liability for actual use based on the examples and diagrams.

No patent liability is assumed by Rockwell Automation, Inc. with respect to use of information, circuits,

equipment, or software described in this manual.

Reproduction of the contents of this manual, in whole or in part, without written permission of Rockwell

Automation, Inc., is prohibited.

Throughout this manual, when necessary, we use notes to make you aware of safety considerations.

WARNING: Identifies information about practices or circumstances that can cause an

explosion in a hazardous environment, which may lead to personal injury or death,

property damage, or economic loss.

ATTENTION: Identifies information about practices or circumstances that can lead to

personal injury or death, property damage, or economic loss. Attentions help you identify

a hazard, avoid a hazard and recognize the consequences.

SHOCK HAZARD: Labels may be on or inside the equipment (for example, drive or

motor) to alert people that dangerous voltage may be present.

BURN HAZARD: Labels may be on or inside the equipment (for example, drive or motor)

to alert people that surfaces may reach dangerous temperatures.

IMPORTANT Identifies information that is critical for successful application and understanding of

the product.

DeviceNet Base RTD and Thermocouple CompactBlock LDX I/O 3

Publication 1790-IN011C-EN-P - January 2015

Environment and Enclosure

Prevent Electrostatic Discharge

ATTENTION: This equipment is intended for use in a Pollution Degree 2

industrial environment, in overvoltage Category II applications (as defined in

IEC publication 60664-1), at altitudes up to 2000 meters (6562 ft)

without derating.

This equipment is considered Group 1, Class A industrial equipment according

to IEC/CISPR Publication 11. Without appropriate precautions, there may be

potential difficulties ensuring electromagnetic compatibility in other

environments due to conducted as well as radiated disturbance.

This equipment is supplied as open-type equipment. It must be mounted within

an enclosure that is suitably designed for those specific environmental

conditions that will be present and appropriately designed to prevent personal

injury resulting from accessibility to live parts. The enclosure must have

suitable flame-retardant properties to prevent or minimize the spread of flame,

complying with a flame spread rating of 5VA, V2, V1, V0 (or equivalent) if

non-metallic. The interior of the enclosure must be accessible only by the use

of a tool. Subsequent sections of this publication may contain additional

information regarding specific enclosure type ratings that are required to

comply with certain product safety certifications.

In addition to this publication, see:

• Industrial Automation Wiring and Grounding Guidelines, for additional

installation requirements, Allen-Bradley publication 1770-4.1.

• NEMA Standards publication 250 and IEC publication 60529, as

applicable, for explanations of the degrees of protection provided by

different types of enclosure.

ATTENTION: This equipment is sensitive to electrostatic discharge, which can

cause internal damage and affect normal operation. Follow these guidelines

when you handle this equipment:

• Touch a grounded object to discharge potential static.

• Wear an approved grounding wriststrap.

• Do not touch connectors or pins on component boards.

• Do not touch circuit components inside the equipment.

• Use a static-safe workstation, if available.

• Store the equipment in appropriate static-safe packaging when not in use.

4 DeviceNet Base RTD and Thermocouple CompactBlock LDX I/O

Publication 1790-IN011C-EN-P - January 2015

North American Hazardous Location Approval

EDS File Requirements

Current functionality of CompactBlock LDX I/O blocks require current modular EDS

file for RSNetWorx for DeviceNet™ version 3.0 or later software.

These files are easy to install and are available online at:

www.ab.com/networks/eds/

EDS files for blocks with matching catalog numbers (for both D-Shell and terminal block

versions) are the same. Thus, on the website and in RSNetWorx for DeviceNet, there is

only one EDS file for both versions of the blocks. For example, if you want the EDS file for

1790D-T8BV8B, use the EDS file labeled 1790D-8BV8B.

The following information applies when

operating this equipment in hazardous

locations:

Informations sur l’utilisation de cet

équipement en environnements dangereux:

Products marked "CL I, DIV 2, GP A, B, C, D" are suitable for

use in Class I Division 2 Groups A, B, C, D, Hazardous

Locations and nonhazardous locations only. Each product is

supplied with markings on the rating nameplate indicating

the hazardous location temperature code. When combining

products within a system, the most adverse temperature

code (lowest "T" number) may be used to help determine the

overall temperature code of the system. Combinations of

equipment in your system are subject to investigation by the

local Authority Having Jurisdiction at the time of

installation.

Les produits marqués "CL I, DIV 2, GP A, B, C, D" ne

conviennent qu'à une utilisation en environnements de

Classe I Division 2 Groupes A, B, C, D dangereux et non

dangereux. Chaque produit est livré avec des marquages sur

sa plaque d'identification qui indiquent le code de

température pour les environnements dangereux. Lorsque

plusieurs produits sont combinés dans un système, le code

de température le plus défavorable (code de température le

plus faible) peut être utilisé pour déterminer le code de

température global du système. Les combinaisons

d'équipements dans le système sont sujettes à inspection

par les autorités locales qualifiées au moment de

l'installation.

EXPLOSION HAZARD

• Do not disconnect equipment unless

power has been removed or the area is

known to be nonhazardous.

• Do not disconnect connections to this

equipment unless power has been

removed or the area is known to be

nonhazardous. Secure any external

connections that mate to this equipment

by using screws, sliding latches, threaded

connectors, or other means provided with

this product.

• Substitution of components may impair

suitability for Class I, Division 2.

• If this product contains batteries, they

must only be changed in an area known to

be nonhazardous.

RISQUE D’EXPLOSION

• Couper le courant ou s'assurer que

l'environnement est classé non dangereux

avant de débrancher l'équipement.

• Couper le courant ou s'assurer que

l'environnement est classé non dangereux

avant de débrancher les connecteurs.

Fixer tous les connecteurs externes reliés

à cet équipement à l'aide de vis, loquets

coulissants, connecteurs filetés ou autres

moyens fournis avec ce produit.

• La substitution de composants peut rendre

cet équipement inadapté à une utilisation

en environnement de Classe I, Division 2.

• S'assurer que l'environnement est classé

non dangereux avant de changer les piles.

DeviceNet Base RTD and Thermocouple CompactBlock LDX I/O 5

Publication 1790-IN011C-EN-P - January 2015

Install the CompactBlock LDX I/O

Follow these steps to install the block:

• set the node address on the base block.

• mount the base block.

• wire the terminal blocks.

•connectfieldwiring.

• connect the DeviceNet cable.

These steps are explained in detail in the following procedures.

Set the Node Address on the Base Block

Each base block comes with its internal program set for node address 63. To reset the node

address, adjust the switches on the front of the block. The two switches are most

significant digit (MSD) and least significant digit (LSD). The switches can be set between

00 and 63.

The base block reads the rotary switches at power up only. Switch settings between 64 and

99 cause the block to use the last valid node address stored internally.

Node Address Example

The node address may also be set through RSNetWorx for DeviceNet or a similar

configuration tool. When software configuration is used for the node address, the switches

must be set between 64 and 99.

Example: Node

Address is set at 11

6 DeviceNet Base RTD and Thermocouple CompactBlock LDX I/O

Publication 1790-IN011C-EN-P - January 2015

Mount the Base Module

You can mount the base block to a panel or DIN rail. We recommend that you ground the

panel or DIN rail before mounting the block.

Dimensions

Mount on a Panel

For panel mounting, use these steps.

1. Place the block against the panel where you want it mounted.

2. Gently pull and position the expansion cover to the left.

3. Place a center punch, nail, or similar device through the mounting holes in the

block and make two marks on the panel at the lower-left and upper-right corners

of the module.

IMPORTANT

The RTD and thermocouple base blocks do not support any expansion

blocks.

WARNING: When used in a Class I, Division 2, hazardous location, this

equipment must be mounted in a suitable enclosure with the proper wiring

method that complies with the governing electrical codes.

CompactBlock LDX

1790-16BVOX

DC INPUTS

EXPANSION UNIT

16 INPUTS-DCPOWER

07DC INPUTS

815

95 mm

(3.74 in.)

41 mm

(1.6 in.)

Expansion

Cable

Cover

44252

DeviceNet Base RTD and Thermocouple CompactBlock LDX I/O 7

Publication 1790-IN011C-EN-P - January 2015

4. Remove the block and drill two holes in the panel to accommodate each of the

mounting screws.

5. Replace the block on the panel and place a screw through each of the two

mounting holes.

6. Tighten the screws until the block is firmly in place.

Mount on DIN Rail

For DIN-rail mounting, use these steps.

1. Hook the top slot of the base block over the DIN rail.

2. Pull down on the locking lever while pressing the base block against the rail.

3. Push up on the locking lever to secure the base block to the rail when the base

block is flush against the rail.

Locking Lever

8 DeviceNet Base RTD and Thermocouple CompactBlock LDX I/O

Publication 1790-IN011C-EN-P - January 2015

Wire the Terminal Block

The following figures show how to wire the terminal blocks.

1790D-4R0 RTD Input Module D-Shell Wiring

• Wire pins 17, 18, 19 to Field Power (+) 24V DC

• Wire pins 35, 36, 37 to Field Power (-) GND

1790D-4T0 Thermocouple Module D-Shell Wiring

• Wire pins 17, 18, 19 to Field Power (+) 24V DC

• Wire pins 35, 36, 37 to Field Power (-) GND

1790D-T4RO RTD Input Module Terminal Block Wiring

• Wire pin 1 to Field Power (+) 24V DC

• Wire pin 2 to Field Power (-) GND

19 18 17 16 15 14 13 12 11 10 987654321

37 36 35 34 33 32 31 30 29 28 27 26 25 24 23 22 21 20

+24V

CH0_A

CH0_B

CH1_A

CH1_B

CH2_A

CH2_B

CH3_A

CH3_B

GND GND NC COM COM COM COM COM COM

GND NC NC COM COM COM COM COM COM

+24V

19 18 17 16 15 14 13 12 11 10 987654321

37 36 35 34 33 32 31 30 29 28 27 26 25 24 23 22 21 20

+24V

CH0_A

CH0_B

CH1_A

CH1_B

CH2_A

CH2_B

CH3_A

CH3_B

GND GND NC NC NC NC NC NC NC

GND NC NC NC NC NC NC NC NC

+24V

CH3_B

COM

CH0_B

COM

CH2_B

CH1_B

GND

COM

CH2_A

CH1_A

+24V

CH3_A

COM

CH0_A

DeviceNet Base RTD and Thermocouple CompactBlock LDX I/O 9

Publication 1790-IN011C-EN-P - January 2015

1790D-T4T0 Thermocouple Input Module Terminal Block Wiring

• Wire pin 1 to Field Power (+) 24V DC

• Wire pin 2 to Field Power (-) GND

Connect Field Wiring

System Wiring Guidelines

Follow these guidelines when wiring your system:

• use shielded, twisted pair wire to ensure proper operation and high immunity to

electrical noise

• to limit noise, locate RTD and resistance device signal wires as far away as possible

from power lines, load lines and other sources of electrical noise, such as

hard-contact switches, relays and AC motor drives

• under normal conditions, the drain wire and shield junction should be connected

to earth ground, via a panel or DIN rail mounting screw at the block end

• keep shield connection to ground as short as possible

• to ensure optimum accuracy, limit overall cable impedance by keeping the cable as

short as possible. Locate the I/O system as close to your field devices as your

application will permit.

RTD Wiring Guidelines

Since the operating principle of the RTD module is based on the measurement of

resistance, give special consideration when selecting the input cable. For 2-wire or 3-wire

configurations, select a cable that has consistent impedance throughout its entire length.

CH3_B

CH0_B

CH2_B

CH1_B

GND

CH2_A

CH1_A

+24V

CH3_A

CH0_A

10 DeviceNet Base RTD and Thermocouple CompactBlock LDX I/O

Publication 1790-IN011C-EN-P - January 2015

When using a 3-wire configuration, the block compensates for resistance error due to lead

wire length. For example, in a 3-wire configuration, the block reads the resistance due to

the length of the wires and assumes that the resistance of the other wire is equal. If the

resistance of the individual lead wires are much different, an error may exist. The closer the

resistance values are to each other, the greater the amount of error is eliminated.

To ensure that the lead values match as closely as possible:

• keep lead resistance as small as possible and less than 25 

• use quality cable that has a small tolerance impedance rating

• use a heavy-gauge lead wire which has less resistance per foot

RTD Wiring Configurations

Three configurations of RTDs can be connected to the blocks:

• 2-wire RTD, which is composed of an RTD EXC (excitation) lead wire and a

RTN (return) wire

• 3-wire RTD, which is composed of a Sense and 2 RTD lead wires (RTD EXC

and RTN)

• 4-wire RTD, which is composed of a Sense and 2 RTD lead wires (RTD EXC

and RTN). The second sense wire of a 4-wire RTD is left open.

IMPORTANT

The RTD block requires three wires to compensate for lead resistance error.

We recommend that you do not use 2-wire RTDs if long cable runs are

required, as it reduces the accuracy of the system.

However, if a 2-wire configuration is required, reduce the effect of the lead

wire resistance by using a lower-gauge wire for the cable (for example, use

AWG #16 instead of AWG #24). The block’s terminal strip accepts

AWG #14 gauge wire.

IMPORTANT

To ensure temperature or resistance value accuracy, the resistance

difference of the cable lead wires must be equal to or less than 0.01 .

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