Rockwell Automation 1790-XXXX User Manual

Installation Instructions

DeviceNet Base RTD and Thermocouple
CompactBlock LDX I/O

(Cat. Nos. 1790D-4R0, -4T0, -T4R0, -T4T0)

What This Document Describes

This document describes how to install your CompactBlock
LDX™ I/O blocks.

For information on: Refer to page:

EDS File Requirements below
Important User Information 2
Installing CompactBlock I/O 5
Wiring the Terminal Blocks 8
Connecting the Field Wiring 9
Connecting the DeviceNet Cable 14
I/O Memory Mapping 15
Troubleshooting with the Indicators 17
Module Specifications 18

EDS File Requirements

Current functionality of CompactBlock LDX I/O blocks requires

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 labled
1790D-8BV8B.

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WARNING

!

WARNING

!

Important User Information

Because of the variety of uses for the products described in this
publication, those responsible for the application and use of these
products must satisfy themselves that all necessary steps have been
taken to assure that each application and use meets all performance
and safety requirements, including any applicable laws, regulations,
codes and standards. In no event will Rockwell Automation be
responsible or liable for indirect or consequential damage resulting
from the use or application of these products.

Any illustrations, charts, sample programs, and layout examples
shown in this publication are intended solely for purposes of
example. Since there are many variables and requirements associated
with any particular installation, Rockwell Automation does not
assume responsibility or liability (to include intellectual property
liability) for actual use based upon the examples shown in this
publication.

Allen-Bradley publication SGI-1.1, Safety Guidelines for the

Application, Installation and Maintenance of Solid-State Control

(available from your local Rockwell Automation office), describes
some important differences between solid-state equipment and
electromechanical devices that should be taken into consideration
when applying products such as those described in this publication.

Reproduction of the contents of this copyrighted publication, in
whole or part, without written permission of Rockwell Automation, is
prohibited.

Throughout this publication, notes may be used to make you aware
of safety considerations. The following annotations and their
accompanying statements help you to identify a potential hazard,
avoid a potential hazard, and recognize the consequences of a
potential hazard:

Publication 1790-IN011B-EN-P - April 2003

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.

3

ATTENTION

!

IMPORTANT

ATTENTION

!

Identifies information about practices or
circumstances that can lead to personal injury or
death, property damage, or economic loss.

Identifies information that is critical for
successful application and understanding of the
product.

Preventing Electrostatic Discharge

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.

• If available, use a static-safe workstation.

• When not in use, store the equipment in

appropriate static-safe packaging.

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ATTENTION

!

Environment and Enclosure

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
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 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.

See NEMA Standards publication 250 and IEC
publication 60529, as applicable, for explanations
of the degrees of protection provided by different
types of enclosure. Also, see the appropriate
sections in this publication, as well as the
Allen-Bradley publication 1770-4.1 ("Industrial
Automation Wiring and Grounding Guidelines"),
for additional installation requirements pertaining
to this equipment.

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5

Installing CompactBlock LDX I/O

Follow these steps to install the block:

1. Set the node address on the base block.

2. Mount the base block.

3. Wire the terminal blocks.

4. Connect field wiring.

5. 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

.

Example: Node
Address is set at 11

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.

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WARNING

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WARNING

!

Mount the Base Block

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.

IMPORTANT

Panel Mounting

1. Place the block against the panel where you want to
mount it.

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 (lower left and upper right corners of the
module).

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

The RTD and thermocouple base blocks do not
support any expansion blocks.

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.

Publication 1790-IN011B-EN-P - April 2003

5. Replace the block on the panel and place a screw

through each of the two mounting holes. Tighten the
screws until the block is firmly in place.

95 mm

3.74 in

CompactBlock LDX

1790-16BVOX

41 mm

1.6 in

EXPANSION UNIT

0

0

7

16 INPUTS-DCPOWER

7

Expansion
Cover

DIN Rail Mounting

1. Hook the top slot of the block over the DIN Rail.

2. Pull down on the locking lever while pressing the block

against the rail.

7

f

Locking Lever

3. Push up on the locking lever to secure the block to the
rail when block is flush against the rail.

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Wire the Terminal Blocks

The following figures show how to wire the terminal blocks.

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

CH1_B

10

29

COM

CH1_B

10

29

NC

NC

11

CH3_B

CH3_A

11

10

CH3_B

NC

28

NC

28

COM

12

9

COM

9

13

12

NC

8

27

NC

8

27

NC

14

COM

NC

13

CH2_B

CH2_A

CH3_A

7

6

26

24

25

COM

COM COM COM

COM

CH2_B

CH2_A

CH3_A

7

6

26

24

25

NC

NC NC NC

NC

NC

NC

17

15

18

16

NC

NC

NC

NC

17

15

16

14

NC

NC

NC

5

5

NC

19

18

CH3_B

23

COM

CH3_B

23

NC

20

NC

NC

19

4

4

20

NC

NC

NC

NC

3

1

2

22

20

21

COM

NC

NC

NC

3

1

2

22

20

21

NC

+24V

NC

NC

CH0_B

+24V

19

37

GND

18

36

GND

+24V

17

35

GND

NC

16

15

34

33

NC

NC

CH0_A

14

32

NC

13

COM

CH1_A

11

12

30

31

COM

COM

• Wire pins 17, 18, 19 to Field Power (+) 24Vdc
Wire pins 35, 36, 37 to Field Power (-) GND

1790D-4T0 Thermocouple Module D-Shell Wiring

+24V

NC

NC

CH0_B

+24V

19

37

GND

18

36

GND

+24V

17

35

GND

NC

16

15

34

33

NC

NC

CH0_A

14

32

NC

CH1_A

11

13

12

30

31

NC

NC

• Wire pins 17, 18, 19 to Field Power (+) 24Vdc
Wire pins 35, 36, 37 to Field Power (-) GND

1790D-T4RO RTD Input Module Terminal Block Wiring

+24V

CH0_A

1

2

GND

CH1_A

3

CH0_B

5

4

CH1_B

COM

6

CH2_A

7

8

COM

CH3_A

9

10

CH2_B

• Wire pin 1 to Field Power (+) 24Vdc
Wire pin 2 to Field Power (-) GND

1790D-T4T0 Thermocouple Input Module Terminal Block Wiring

+24V

CH1_A

5

4

CH1_B

6

NC

7

CH2_A

9

8

CH2_B

NC

CH0_A

1

2

GND

3

CH0_B

• Wire pin 1 to Field Power (+) 24Vdc
Wire pin 2 to Field Power (-) GND

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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.

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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.

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.

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 ohm.

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11

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

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

• 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.

2-Wire RTD Configuration

Add Jumper

CH0_A

CH0_B

COM

Cable Shield (to Ground)

RTD EXC RTD EXC

Return Return

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3-Wire RTD Configuration

Cable Shield (to Ground)

CH0_A

CH0_B

COM

RTD EXC

Sense

Return

RTD EXC

Sense

Return

4-Wire RTD Configuration

Leave this sensor wire open

RTD EXC

Sense

Return

CH0_A

CH0_B

COM

Cable Shield (to Ground)

RTD EXC

Sense

Return

Wiring Resistance Devices (Potentiometers)

Potentiometer wiring requires the same type of cable as
that for the RTD. Potentiometers can be connected to the
module as a 2-wire or 3-wire connection as shown in the
following figures:

2-Wire Potentiometer Interconnection

Add Jumper

CH0_A

CH0_B

COM

Add Jumper

CH0_A

CH0_B

COM

Cable Shield (to Ground)

RTD EXC

Return

Cable Shield (to Ground)

RTD EXC

Return

Publication 1790-IN011B-EN-P - April 2003

Potentiometer

Potentiometer

3-Wire Potentiometer Interconnection

TIP

r

The potentiometer wiper arm can be
connected to either the EXC or return
terminal, depending on whether you
want increasing or decreasing
resistance.

Cable Shield (to Ground)

CH0_A

CH0_B

COM

CH0_A

CH0_B

COM

RTD EXC

Return

Cable Shield (to Ground)

RTD EXC

Sense

Return

13

Potentiomete

Run Return and sense wires from
the module to potentiometer terminal
and tie terminal to one point

Potentiometer

Run Return and sense wires from
the module to potentiometer terminal
and tie terminal to one point

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WARNING

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WARNING

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Connect the DeviceNet Cable

Follow these procedures when connecting the DeviceNet
cable to the base block.

The required DeviceNet connector is not supplied with the
block - you must purchase it separately. There are three types
of connectors that you can order directly from Rockwell
Automation or your local distributor:

• 1799-DNETCON - 5-position open style connector

• 1799-DNETSCON - 5-position open style connector with

locking screws

• 1799-DNC5MMS - 5-position open style to 5-pin micro

male connector with locking screws

If you connect or disconnect the DeviceNet
cable with power applied to this module or
any device on the network, an electrical arc
can occur. This could cause an explosion in
hazardous location installations.

Be sure that power is re moved or the area is
nonhazardous before proceeding.

Connect the DeviceNet wiring (drop line) to one of the
DeviceNet connectors as shown below. A color-coded wiring
diagram is also printed next to the connector on the left side
of the module

CompactBlock LDX

Wiring Diagram for
1799-DNETCON

1790D-8BV8V

8 INPUTS/8OUTPUTS-DC POWER

7

0

7

0

V+ Red

Can_H White

Drain/Shield

Can_L Blue

V- Black

V+ Red

V- Black

Wiring Diagram for
1799-DNC5MMS

Publication 1790-IN011B-EN-P - April 2003

Drain/Shield

Can_H White

Can_L Blue

15

Once you have properly wired the drop line to the connector,
attach the connector to the block. If applicable, use the
locking screws on the connector to fasten it to the block.

I/O Memory Mapping

1790D-4R0, -T4R0 Input Data File

Word Bit Position

1514131211109876543210

0 RTD Input Data Channel 0

1 RTD Input Data Channel 1

2 RTD Input Data Channel 2

3 RTD Input Data Channel 3

4 Not Used S11 S10 S9 S8 Not Used S3 S2 S1 S0

Word/Bit Descriptions for 1790D-4R0, -T4R0 RTD Module

Word Decimal Bit Description

Read Word 0 Bits 00-15 Channel 0 input data

Read Word 1 Bits 00-15 Channel 1 input data

Read Word 2 Bits 00-15 Channel 2 input data

Read Word 3 Bits 00-15 Channel 3 input data

Read Word 4

Bits 00-03 Underrange for individual channels - Bit 00 corresponds to

Bits 04-07 Not used: Set to 0

Bits 08-11 Overrange for individual channels - Bit 08 corresponds to

Bits 12-15 Not used: Set to 0

input channel 0, bit 01 corresponds to input channel 1 and
so on.
When set (1) the input signal is below the input channel’s
minimum range.

input channel 0, bit 09 corresponds to input channel 1 and
so on.
When set (1) the input signal is above the input channel’s
maximum range, or open RTD is detected.

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1790D-4T0, -T4T0 Input Data File

Word Bit Position

1514131211109876543210

0 Thermocouple Input Data Channel 0

1 Thermocouple Input Data Channel 1

2 Thermocouple Input Data Channel 2

3 Thermocouple Input Data Channel 3

4 Not Used S11 S10 S9 S8 Not Used S3 S2 S1 S0

Word/Bit Descriptions for 1790D-4T0, -T4T0 Thermocouple Module

Word Decimal Bit Description

Read Word 0 Bits 00-15 Channel 0 input data

Read Word 1 Bits 00-15 Channel 1 input data

Read Word 2 Bits 00-15 Channel 2 input data

Read Word 3 Bits 00-15 Channel 3 input data

Read Word 4

Bits 00-03 Underrange for individual channels - Bit 00 corresponds to

Bits 04-07 Not used: Set to 0

Bits 08-11 Overrange for individual channels - Bit 08 corresponds to

Bits 12-15 Not used: Set to 0

input channel 0, bit 01 corresponds to input channel 1 and
so on.

When set (1) the input signal is below the input channel’s
minimum range.

input channel 0, bit 09 corresponds to input channel 1 and
so on.
When set (1) the input signal is above the input channel’s
maximum range, or open thermocouple is detected.

Publication 1790-IN011B-EN-P - April 2003

Troubleshoot with the Indicators

The 1790D I/O block has the following indicators:

• module status

• network status

• I/O status

Mod/Net Status Indicator

LED Indicator: Status: Description:

Module Status Solid Red Unrecoverable fault in base unit

Flashing Red Recoverable fault

Solid Green Normal operation - OK

Flashing Green Standby

Off No power

LED Indicator: Status: Description:

Network Status Solid Red Unrecoverable communication fault

Flashing Red Recoverable communication fault

Solid Green Communication path complete - OK

Flashing Green Communication path incomplete

Off Device not online or not powered

17

I/O Channel LED Status Indicator

Status: Description:

Flashing Green/Red Power up

Off Off line

Red On line and no field power

Red DeviceNet connection and no field power

Flashing Red Field power and open wire

Green Field power and valid input

Flashing Red Input over range

Flashing Red Input under range

Flashing Red Recoverable fault

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DeviceNet RTD and Thermocouple Base Block Specifications

The following table contains specifications that are common to
all of the blocks in this document. Individual base block

specifications are detailed after this table.

Environmental Specifications

Operating Temperature 0 to 55°C (32 to 131°F) - Analog I/O

Storage Temperature -40 to 85°C (-40 to 185°F)

Relative Humidity 5-90% non-condensing

Operating Altitude 2000m

Vibration 2g @ 10-500Hz

Shock
Operating
Non-operating

Emissions Group 1, Class A

ESD Immunity 8kV air discharges

Radiated RF Immunity 10V/m with 1kHz sine-wave 80%AM from 80MHz to 1000MHz

EFT/B Immunity 1kV @ 5kHz on power ports

Surge Transient Immunity +

Conducted RF Immunity 10Vrms with 1kHz sine-wave 80%AM from 150kHzto 80MHz

Enclosure Type Rating None (open style)

Mounting DIN rail or screw

Dimensions 52x104x42mm (2.03x4.07x1.64in)

Weight 0.3lb (0.1kg)

IEC 60068-2-1 (Test Ad, Operating Cold),
IEC 60068-2-2 (Test Bd, Operating Dry Heat),
IEC 60068-2-14 (Test Nb, Operating Thermal Shock)

IEC 60068-2-1 (Test Ab, Un-packaged Non-operating Cold),
IEC 60068-2-2 (Test Bb, Un-packaged Non-operating Dry

Heat),

IEC 60068-2-14 (Test Na, Un-packaged Non-operating Thermal

Shock)

IEC 60068-2-30 (Test Db, Un-packaged Non-operating)

IEC60068-2-6 (Test Fc, Operating)

10g
30g
EC60068-2-27 (Test Ea, Unpackaged Shock)

CISPR 11

IEC 61000-4-2

10V/m with 200Hz 50% Pulse 100%AM @ 900Mhz

IEC 61000-4-3

+

2kV @ 5kHz on signal ports

+

2kV @ 5kHz on communications ports

IEC 61000-4-4

1kV line-line(DM) and +2kV line-eath(CM) on signal ports

2kV line-earth(CM) on shielded ports

+

EC 61000-4-5

IEC 61000-4-6

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DeviceNet Specifications

Network protocol I/O Slave messaging:

Network length 500 meters maximum @ 125Kbps

Indicators 1 red/green module status

Number of nodes 64 maximum - rotary switch type node address setting

Communication rate 125Kbps, 250Kbps, 500Kbps - auto baud rate selection

Isolation Type test 1250Vac rms for 60 seconds between field power and

Wiring Refer to publication DN-6.7.2

General Specifications

Wiring Category

Product
Certifications
(when product is
marked)

1

Refer to publication 1770-4.1, Programmable Controller Wiring and Grounding Guidelines.

2

See the Product Certification link at www.ab.com for Declarations of Conformity, Certificates, and other

certification details.

- Poll command

- Bit Strobe command

- Cyclic command

- COS command

100 meters maximum @ 500Kbps

1 red/green network status

DeviceNet (I/O to logic)

1

2

c-UL-us UL Listed for Class I, Division 2 Group A,B,C,D Hazardous

Locations, certified for U.S. and Canada

2

CE

with:

European Union 89/336/EEC EMC Directive, compliant

EN 50082-2; Industrial Immunity
EN 61000-6-4; Industrial Emissions

EN61326; Meas./Control/Lab., Industrial Requirements

EN 61000-6-2; Industrial Immunity

2

C-Tick

Australian Radiocommunications Act, compliant with:
AS/NZS CISPR11; Industrial Emissions

ODVA ODVA conformance tested to DeviceNet specifications

Publication 1790-IN011B-EN-P - April 2003

20

4-Channel Input RTD Base Module Specification

1790D-4R0, 1790D-T4R0

Inputs per module 4 channel, RTD/Resistance Input
Input Range 1-625
Sensors Supported Sensor Type Degree Counts Resolution

Resistance 100m
Resistance 10mΩ 1 to 327Ω 100 to

100ohm Pt/α =0.00385 -200 to

200ohm Pt/

500ohm Pt/α =0.00385 -200 to

100ohm Pt/

200ohm Pt/α =0.003916 -200 to

500ohm Pt/

100ohm Nickel -60 to

120ohm Nickel -80 to

200ohm Nickel -60 to

500ohm Nickel -60 to

Resolution 16 bits across 625ohms, 0.1°C/bit or 0.1°F/bit (RTD Sensors)

20bit Sigma-Delta modulation converter
Data Format 16 bit Integer (2’s compliment)
Module Scan Time 8ms/channel @ Notch Filter = 60Hz
Overall accuracy 0.2% Full scale @0°C-60°C
Settable Notch Filter 10Hz (default), 25Hz, 50Hz, 60Hz, 100Hz, 250Hz, 500Hz
Open Wire Detection Out of range, open wiring
Excitation Current 1mA
Input Impedance 5M ohm

Ω 1 to 625Ω 10 to 6250 100mΩ

α =0.00385 -200 to

α =0.003916 -200 to

α =0.003916 -200 to

s

+850°C

+850°C

+650°C

+640°C

+640°C

+640°C

250°C

260°C

250°C

250°C

32700

-2000 to
+8500

-2000 to
+8500

-2000 to
+6500

-2000 to
+6400

-2000 to
+6400

-2000 to
+6400

-600 to
2500

-800 to
2600

-600 to
2500

-600 to
2500

10mΩ

0.1°C

0.1°C

0.1°C

0.1°C

0.1°C

0.1°C

0.1°C

0.1°C

0.1°C

0.1°C

Specifications continured on next page.

Publication 1790-IN011B-EN-P - April 2003

General Specifications

DeviceNet Power Supply voltage - 24V dc nominal

Field Power Supply Voltage - 24Vdc nominal

Isolation I/O to logic: photocoupler isolation

Indicators 4 red/green I/O status
Wiring

1790D-4R0
1790D-T4R0

IMPORTANT: This module does not support any expansion modules.

Voltage range - 11-28.8V dc

Power dissipation - 1.2W maximum @ 28.8V dc

Voltage Range - 21.6-26.4V dc (+

Power Dissipation - 1.5W maximum @26.4V dc

Isolation voltage: Type Test 1250V ac rms for 60 seconds

DeviceNet to logic: non-isolated

Field power: non-isolated

37-pin D-Shell connector

Terminal block connector

screw torque: 7 inch pounds maximum

10%)

4-Channel Input Thermocouple Base Module Specifications

1790D-4T0, 1790D-T4T0

Inputs per module 4 channel, Thermocouple/mV Input
Input Range +
Sensors Supported Sensor Type Range Scaling

Resolution 16 bits, 0.1°C/bit or 0.1°F/bit (Thermocouple Sensors)

Data Format 16 bit Integer (2’s compliment)
Module Scan Time 140ms/channel @ Notch Filter = 60Hz
Overall accuracy 0.2% Full scale @0°C-60°C
Settable Notch Filter 10Hz (default), 25Hz, 50Hz, 60Hz, 100Hz, 250Hz, 500Hz
Open Wire Detection Out of range, open wiring
Cold Junction

Compensation Range

76.50mV

Voltage 10V -76.50 to +76.50mV -7650 to +7650
Type B 300 to 1800°C 3000 to 18000
Type E -270 to 1000°C -2700 to 10000
Type J -210 to 1200°C -2100 to 12000
Type K -270 to 1370°C -2700 to 13700
Type R -50 to 1768°C -500 to 17680
Type S -50 to 1768°C -500 to 17680
Type T -270 to 400°C -2700 to 4000
Type N -270 to 1300°C -2700 to 13000

20bit Sigma-Delta modulation converter

0 to 70°C

21

Publication 1790-IN011B-EN-P - April 2003

22

Input Impedance 5M ohm

General Specifications

DeviceNet Power Supply voltage - 24V dc nominal

Field Power Supply Voltage - 24Vdc nominal

Isolation I/O to logic: photocoupler isolation

Indicators 4 red/green I/O status
Wiring

1790D-4T0
1790D-T4T0

IMPORTANT: This module does not support any expansion modules.

Voltage range - 11-28.8V dc
Power dissipation - 1.2W maximum @ 28.8V dc

Voltage Range - 21.6-26.4V dc (+
Power Dissipation - 1.5W maximum @26.4V dc

Isolation voltage: Type Test 1250V ac rms for 60 seconds
DeviceNet to logic: non-isolated
Field power: non-isolated

37-pin D-Shell connector
Terminal block connector
screw torque: 7 inch pounds maximum

10%)

Publication 1790-IN011B-EN-P - April 2003

23

IMPORTANT

Input and output wiring must be in accordance
with Class 1, Division 2 wiring methods and in

accordance with the authority having jurisdiction.

The following information applies
when operating this equipment in
hazardous locations:

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.

EXPLOSION HAZARD

• Do not disconnect

WARNING

!

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.

Informations sur l’utilisation de cet
équipement en environnements
dangereux :

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.

RISQUE D’EXPLOSION

• Couper le courant ou

AVERTISSEMENT

!

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.

Publication 1790-IN011B-EN-P - April 2003

This product has been tested at an Open Device Vendors
Association, Inc. (ODVA) authorized independent test
laboratory and found to comply with ODVA Conformance
Test. Please contact the ODVA website (http://www.odva.org)
for listing of products tested by ODVA independent test labs
for further details.

CompactBlock LDX and RSNetWorx for DeviceNet are trademarks of Rockwell Automation.
DeviceNet is a trademark of Open DeviceNet Vendor Association.

Publication 1790-IN011B-EN-P - April 2003 PN20957657-64

Supersedes Publication 1790-IN011A-EN -P - January 2002

© 2 003 Roc kw ell Automation. Printed in USA