1790/D/P CompactBlock LDX I/O

Product Overview
  
Click to enlarge - 1790 Bevel_4C

CompactBlock LDX I/O

The CompactBlock LDX I/O system offers a compact, cost-effective, and diverse distributed I/O solution for automation solutions. Offering 24V DC , 120V AC , relay, analog, and temperature modules, CompactBlock LDX I/O supports a wide breadth of field devices and is compatible on both DeviceNet and PROFIBUS DP networks. CompactBlock LDX I/O is especially suitable where low cost and confined space are coupled with less-stringent IP20 environmental requirements.

Benefits


CompactBlock LDX I/O offers the leading, lowest-cost, device-level communication network, the DeviceNet network, to translate simple messages from the controller to the plant floor.


CompactBlock LDX I/O is also available on PROFIBUS DP.


Product Design

CompactBlock LDX I/O blocks are available as either base blocks or expansion blocks. Base blocks contain a maximum of 32 digital or 4 analog I/O, as well as a built-in DeviceNet or PROFIBUS DP network adapter. Thermocouple and RTD base blocks are also available.

CompactBlock LDX I/O expansion blocks contain 16 digital I/O and connect to a base block or another expansion block through a ribbon cable. An expansion block cannot be used alone.

The digital base modules support up to 3 digital expansion modules and up to 80 points of I/O for the DeviceNet network and 64 points of I/O for the PROFIBUS DP network. The analog base modules, both current and voltage, support two additional modules of up to 32 points of digital I/O. The RTD and thermocouple base modules do not support any expansion.

The wide variety of base and expansion combinations lets you eliminate unnecessary I/O points. In addition, CompactBlock LDX I/O modules, including digital (24V DC , 120V AC , and relay), analog (current and voltage), and temperature (resistance temperature detector and thermocouple), are compatible with a variety of sensors.

The DeviceNet network supplies power to DeviceNet base blocks and expansion blocks. A separate external 24V DC power supply is required for PROFIBUS DP base blocks and expansion blocks. Inputs and outputs are powered by an external 24V DC source that is independent of the network.

CompactBlock LDX I/O blocks are available with either D-shell or screw terminal I/O connectors. The blocks can be mounted on a panel or DIN rail in virtually any orientation.


Communication

DeviceNet Network

CompactBlock LDX I/O modules are compatible with PLC, SLC, ControlLogix, CompactLogix, MicroLogix1500 or SoftLogix programmable controllers when used with DeviceNet scanners. The CompactBlock LDX I/O module AC ts as a slave in a master/slave environment. I/O data is exchanged with the master through a polled, cyclic, or change-of-state connection. This selection is made in the DeviceNet scanner module's configuration.

CompactBlock LDX I/O modules require RSNetWorx for DeviceNet software, version 3.0 or later (version 7.0 or later recommended). Additionally, current functions of CompactBlock LDX I/O modules require current, modular EDS files for RSNetWorx for DeviceNet software. These files are easy to install and are available online at http://www.ab.com/networks/eds/.

The DeviceNet network supplies power to the CompactBlock I/O base and expansion modules. Inputs and outputs are powered by an external 24V DC source that is independent of the network.

PROFIBUS DP Network

Optimized for high speed and inexpensive installation, the PROFIBUS DP network (decentralized periphery) is designed especially for communication between programmable controllers (PLCs) and distributed I/O at the device level. Data exchange is mainly cyclic with field devices such as I/O, valves, drives, and measuring transducers. The primary controller (master) reads the input information from the field devices (slaves) and sends the output information back to the slaves.

You can configure CompactBlock I/O modules using GSD files and any PROFIBUS DP configuration package. The GSD files are available online at http://www.ab.com/networks/gsd/.

An external power supply for the PROFIBUS network is required for CompactBlock LDX I/O base modules. Inputs and outputs are powered by an external 24V DC source which is independent of the network.

Typical Configuration

Click to enlarge - 1790D_LDX_DNETConfig


Click to enlarge - 1790P_LDX_PROFIConfig

Specifications

General Specifications

Enclosure Type Rating Meets IP20
Mounting Type DIN-rail, Panel
Operating Temperature 0…60 °C (32…140 °F)
Non-Operating Temperature -40…85 °C (-40…185 °F)
Relative Humidity 5…90% noncondensing
Operating Shock 10 g
Non-Operating Shock 30 g
Vibration 5 g @ 10…500 Hz
Certifications¬  c-UL-us Class I Div 2 Hazardous, CE, C-Tick, ODVA
¬ When product is marked. See the Product Certification link at www.ab.com for Declarations of Conformity, Certificates, and other certification details.

Dimensions and Weights

Description Dimensions (HxWxD), Approx. Weight
16-point Base Blocks, DeviceNet 52 x 104 x 42 mm  (2.03 x 4.07 x 1.64 in) 0.1 kg (0.3 lb)
32-point Base Blocks, DeviceNet 52 x 176 x 42 mm  (2.03 x 6.93 x 1.64 in.) 0.3 kg (0.9 lb)
Base Blocks, PROFIBUS DP 52 x 118.5 x 42 mm (2.03 x 4.62 x 1.64 in) 0.1 kg (0.3 lb)
Expansion I/O Blocks 52 x 104 x 42 mm  (2.03 x 4.07 x 1.64 in) 0.1 kg (0.3 lb)
  

Digital I/O Base Blocks


Digital Input Base Blocks

Cat. No. 1790D-T8A0 1790D-16BV0 1790D-T16BV0 1790D-T32BV0
Termination Type Screw-clamp D-shell Screw-clamp Screw-clamp
Number of Inputs 8 Non-isolated 16 Sink/Source, Non-isolated 32  Sink/Source, Non-isolated
Voltage, On-State Input, Nom. 120V AC 24V DC 24V DC
Voltage, On-State Input, Range 79…132V AC 9.6…28.8V DC 9.6…28.8V DC
Current, On-State, Max. 9 mA @ 132V AC 8 mA per channel @ 28.8V DC 8 mA per channel @ 28.8V DC
Input Signal Delay On to Off: 30 ms
Off to On: 10 ms
On to Off: 2 ms
Off to On: 2 ms
On to Off: 2 ms
Off to On: 2 ms
Network Adapter DeviceNet
Network Current Load 100 mA
DeviceNet Power Dissipation, Max. 1.2 W @ 28.8V DC

Digital Output Base Blocks

Cat. No. 1790D-T0A6 1790D-0B16 1790D-T0B16 1790D-0V16 1790D-T0V16 1790D-T0V32 1790D-T0B32
Termination Type Screw-clamp D-shell Screw-clamp D-shell Screw-clamp Screw-clamp Screw-clamp
Number of Outputs 6 Non-isolated 16 Source, Non-isolated 16 Sink, Non-isolated 32 Sink, Non-isolated 32 Source, Non-isolated
Voltage, On-State Output, Nom. 120V AC 24V DC 24V DC 24V DC
Voltage, On-State Input, Range 15…132V AC 10…28.8V DC 10…28.8V DC 10…28.8V DC
Output Current Rating 0.5 A rms 0.5 A max. per output, 4.0 A max. per common 0.5 A max. per output, 4.0 A max. per common 0.5 A max. per output, 4.0 A max. per common
Current, On-State, Min. 10 mA rms 1 mA per channel 1 mA per channel 1 mA per channel
Output Signal Delay Off to On: 10 ms
On to Off: 30 ms max.
Off to On: 0.5 ms max.
On to Off: 1.0 ms max.
Off to On: 0.5 ms max.
On to Off: 1.0 ms max.
Off to On: 0.5 ms max.
On to Off: 1.0 ms max.
Network Adapter DeviceNet
Network Current Load 100 mA
DeviceNet Power Dissipation, Max. 1.2 W @ 28.8V DC

Digital Relay Output Base Blocks

Cat. No. 1790D-0W6 1790D-T0W6 1790P-T0W6
Termination Type D-shell Screw-clamp Screw-clamp
Number of Outputs 6 Contact Output, Isolated
Relay Type Form A, normally open, single pole, single throw
Relay Output Current Rating, Resistive 2.0 A @ 5…28V DC (at rated load)
0.8 A @ 48V DC (at rated load)
2.0 A @ 125V AC (at rated power)
2.0 A @ 250V AC (at rated power)
Network Adapter DeviceNet PROFIBUS DP
Network Current Load 100 mA 150 mA
Network Power Dissipation, Max. 1.2 W @ 28.8V DC

Digital 24V DC Combination Base Blocks

Cat. No. 1790D-8BV8B 1790D-T8BV8B 1790P-T8BV8B 1790D-8BV8V 1790D-T8BV8V 1790P-T8BV8V 1790D-T16BV16V 1790D-T16BV16B
Termination Type D-shell Screw-clamp Screw-clamp D-shell Screw-clamp Screw-clamp Screw-clamp Screw-clamp
Inputs
Number of Inputs 8  Sink/Source, Non-isolated 8  Sink/Source, Non-isolated 16  Sink/Source Non-isolated
Voltage, On-State Input, Nom. 24V DC 24V DC 24V DC
Voltage, On-State Input, Range 9.6…28.8V DC 9.6…28.8V DC 9.6…28.8V DC
Current, On-State Input, Max. 8 mA per channel @ 28.8V DC 8 mA per channel @ 28.8V DC 8 mA per channel @ 28.8V DC
Input Signal Delay On to Off: 2 ms
Off to On: 2 ms
On to Off: 2 ms
Off to On: 2 ms
On to Off: 2 ms
Off to On: 2 ms
Outputs
Number of Outputs 8  Source, Non-isolated 8  Sink, Non-isolated 16  Sink, Non-isolated 16  Source, Non-isolated
Voltage, On-State Output, Nom. 24V DC 24V DC 24V DC
Voltage, On-State Output, Range 10…28.8V DC 10…28.8V DC   10…28.8V DC
Current, On-State Output, Min. 1 mA per channel 1 mA per channel 1 mA per channel
Output Current Rating 0.5 A per output, 4.0 A max. per common 0.5 A per output, 4.0 A max. per common 0.5 A per output, 4.0 A max. per common
Output Signal Delay On to Off: 1.0 ms
Off to On: 0.5 ms
On to Off: 1.0 ms
Off to On: 0.5 ms
On to Off: 1.0 ms
Off to On: 0.5 ms
Network Adapter DeviceNet PROFIBUS DP DeviceNet PROFIBUS DP DeviceNet
Network Current Load 100 mA 150 mA 100 mA 150 mA 100 mA
Network Power Dissipation, Max. 1.2 W @ 28.8V DC 1.2 W @ 28.8V DC

Analog I/O Base Blocks


Analog Input Base Blocks

Cat. No. 1790D-N4V0 1790D-TN4V0 1790D-N4C0 1790D-TN4C0 1790P-TN4C0
Termination Type D-shell Screw-clamp D-shell Screw-clamp Screw-clamp
Number of Inputs 4 Single-ended, Non-isolated 4 Single-ended, Non-isolated
Signal Range 0…10V DC 0…20 mA
4…20 mA
Conversion Rate 10 ms/channel 10 ms/channel
Resolution 12 bits-unipolar
1/4096 max.
2.44 mV/bit
12 bits-unipolar
1/4096 max
3.90 mA/bit (4…20 mA)
4.88 mA/bit (0…20 mA)
Overall Accuracy Voltage Input: 0.2% Full scale @ 0…55 °C Current Input: 0.2% Full scale @ 0…55 °C
Network Adapter DeviceNet DeviceNet PROFIBUS DP
Network Current Load 85 mA 85 mA 135 mA
Network Power Dissipation, Max. 1.2 W @ 28.8V DC

Analog Output Base Blocks

Cat. No. 1790D-N0V2 1790D-TN0V2 1790D-N0C2 1790D-TN0C2 1790P-TN0C2
Termination Type D-shell Screw-clamp D-shell Screw-clamp Screw-clamp
Number of Outputs 2 Single-ended, Non-isolated 2 Single-ended, Non-isolated
Signal Range 0…10V DC 0…20 mA
Conversion Rate 2 ms/channel 2 ms/channel
Resolution 12 bits
1/4096 max
2.44 mV/bit
12 bits
1/4096 max
4.88 mA/bit
Overall Accuracy Voltage Output: 0.2% Full scale @ 0…55 °C Current Output: 0.2% Full scale @ 0…55° C
Network Adapter DeviceNet DeviceNet PROFIBUS DP
Network Current Load 85 mA 85 mA 135 mA
Network Power Dissipation, Max. 1.2 W @ 28.8V DC

Thermocouple and RTD Base Blocks


Cat. No. 1790D-4T0 1790D-T4T0 1790D-4R0 1790D-T4R0 1790P-T4R0
Termination Type D-shell Screw-clamp D-shell Screw-clamp Screw-clamp
Number of Inputs 4 Thermocouple, Millivolt, Non-isolated 4 Thermocouple, Millivolt, Non-isolated 4 RTD, Non-isolated
Signal Range ±76.50 mV DC 1…625 W
Module Scan Time 140 ms/channel @ Notch Filter = 60 Hz 8 ms/channel @ Notch Filter = 60 Hz
Input Resolution 16 bits, 0.1 °C/bit or 0.1 °F/bit (Thermocouple Sensors)
20 bit Sigma-Delta modulation converter
16 bits across 625 ohms, 0.1 °C/bit or 0.1 °F/bit (RTD Sensors)
20 bit Sigma-Delta modulation converter
Overall Accuracy 0.2% Full scale @ 0…60 °C 0.2% Full scale @ 0…60 °C
Network Adapter DeviceNet DeviceNet PROFIBUS DP
Network Current Load 50 mA 50 mA 100 mA
Network Power Dissipation, Max. 1.2 W @ 28.8V DC

Cat. No. Sensors Supported
1790D-4T0
1790D-T4T0
10V: -76.50…+76.50 mV Range, -7650…+7650 Scaling
Type B: 300…1800 °C Range, 3000…18000 Scaling
Type E: -270…1000 °C Range, -2700…10000 Scaling
Type J: -210…2100 °C Range, -2100…21000 Scaling
Type K: -270…1370 °C Range, -2700…13700 Scaling
Type R, -50…1768 °C Range, -500…17680 Scaling
Type S: -50…1768 °C Range, -500…17680 Scaling
Type T: -270…400 °C Range, -2700…4000 Scaling
Type N: -270…1300 °C Range, -2700…13000 Scaling
1790D-4R0
1790D-T4R0
1790P-T4R0
100 mW, 1…625W, 10…6250 counts, 100 mW resolution
10 mW, 1…327W, 100…32700 Counts, 10 mW Resolution
100W Pt/a = 0.00385, -200…+850 °C, 2000…+8500 Counts, 0.1 °C Resolution
200W Pt/a = 0.00385, -200…+850 °C, -2000…+8500 Counts, 0.1 °C Resolution
500W Pt/a = 0.00385, -200…+650 °C, -2000…+6500 Counts, 0.1 °C Resolution
100W Pt/a = 0.003916, -200…+640 °C, -2000…+6400 Counts, 0.1 °C Resolution
200W Pt/a = 0.003916, -200…+640 °C, -2000…+6400 Counts, 0.1 °C Resolution
500W Pt/a = 0.003916, -200…+640 °C, -2000…+6400 Counts, 0.1 °C Resolution
100W Nickel, -60…+250 °C, -600…+2500 Counts, 0.1 °C Resolution
120W Nickel, -80…+260 °C, -800…+2600 Counts, 0.1 °C Resolution
200W Nickel, -60…+250 °C, -600…+2500 Counts, 0.1 °C Resolution
500W Nickel, -60…+250 °C, -600…+2500, Counts, 0.1 °C Resolution
  

Digital I/O Expansion Blocks


Digital Input Expansion Blocks

Cat. No. 1790-T8A0X 1790-16BV0X 1790-T16BV0X
Termination Type Screw-clamp D-shell Screw-clamp
Number of Inputs 8 Non-isolated 16 Sink/Source, Non-isolated
Voltage, On-State Input, Nom. 120V AC 24V DC
Voltage, On-State Input, Range 85…132V AC 9.6…28.8V DC
Current, On-State, Max. 9 mA @ 132V AC 8 mA per channel @ 28.8V DC
Input Signal Delay On to Off: 30 ms
Off to On: 10 ms
On to Off: 2 ms
Off to On: 2 ms

Digital Output Expansion Blocks

Cat. No. 1790-T0A8X 1790-0B16X 1790-T0B16X 1790-0V16X 1790-T0V16X
Termination Type Screw-clamp D-shell Screw-clamp D-shell Screw-clamp
Number of Outputs 8 Non-isolated 16 Source, Non-isolated 16 Sink, Non-isolated
Voltage, On-State Output, Nom. 120V AC 24V DC 24V DC
Voltage, On-State Input, Range 15…132V AC 10…28.8V DC 10…28.8V DC
Output Current Rating 0.5 A rms 0.5 A max. per output, 4.0 A max. per common 0.5 A max. per output, 4.0 A max. per common
Current, On-State, Min. 10 mA rms 1 mA per channel 1 mA per channel
Output Signal Delay Off to On: 1 ms
On to Off: 1/2 cycle + 1 ms
Off to On: 0.5 ms
On to Off: 1.0 ms
Off to On: 0.5 ms
On to Off: 1.0 ms

Digital Relay Output Expansion Blocks

Cat. No. 1790-0W8X 1790-T0W8X
Termination Type D-shell Screw-clamp
Number of Outputs 8 Contact Output, Isolated
Relay Type Form A, normally open, single pole, single throw
Relay Output Current Rating, Resistive 2.0 A @ 5…24V DC (at rated load)
2.0 A @ 30V AC
2.0 A @ 5…28V DC (at rated load)
0.8 A @ 48V DC (at rated load)
2.0 A @ 125V AC (at rated load)
2.0 A @ 250V AC (at rated load)

Digital 24V DC Combination Expansion Blocks

Cat. No. 1790-8BV8BX 1790-T8BV8BX 1790-8BV8VX 1790-T8BV8VX
Termination Type D-shell Screw-clamp D-shell Screw-clamp
Inputs
Number of Inputs 8  Sink/Source, Non-isolated 8  Sink/Source, Non-isolated
Voltage, On-State Input, Range 9.6…28.8V DC 9.6…28.8V DC
Current, On-State Input, Max. 8 mA per channel @ 28.8V DC 8 mA per channel @ 28.8V DC
Input Signal Delay On to Off: 2 ms
Off to On: 2 ms
On to Off: 2 ms
Off to On: 2 ms
Outputs
Number of Outputs 8  Source, Non-isolated 8  Sink, Non-isolated
Voltage, On-State Output, Range 10…28.8V DC 10…28.8V DC
Current, On-State Output, Min. 1 mA per channel @ 28.8V DC 1 mA per channel @ 28.8V DC
Output Current Rating 0.5A max. per output, 4.0 A max. per common 0.5A max. per output, 4.0 A max. per common
Output Signal Delay Off to On: 0.5ms
On to Off: 1.0ms
Off to On: 0.5ms
On to Off: 1.0ms

Accessory Products

DeviceNet Communication Cable Assemblies

Cat. No. Description Length (m) Connector Shell Type
1485K-P1F5-C Unshielded DeviceNet drop cable assembly with micro-male connector for connection to a flat trunk cable 1 m aluminum
1485K-P6F5-C 6 m aluminum
1485R-P1M5-C Shielded DeviceNet drop cable assembly with mini-male connector for connection to a round trunk cable 1 m aluminum
1485RS-P1M5-C stainless steel
1485R-P2M5-C Shielded DeviceNet drop cable assembly with mini-male connector for connection to a round trunk cable 2 m aluminum
1485RS-P2M5-C stainless steel
1485R-P3M5-C Shielded DeviceNet drop cable assembly with mini-male connector for connection to a round trunk cable 3 m aluminum
1485RS-P3M5-C stainless steel
Note: You can also use a cable section with no connectors.

Cables and Connectors

Cat. No. Description
1790-7CMCBL 7-cm ribbon cable for connecting one block to the next (Qty. 5)
1790-15CMCBL 15-cm ribbon cable for connecting one block to the next (Qty. 5)
1799-DNETCON 5-pin open-style plug for DeviceNet connection
1799-DNETSCON 5-pin open-style plug with locking screws for DeviceNet connection
  

DeviceNet Straight 5-pin Open Plug to 5-pin Micro Male Connector

Click to enlarge - 1799-DNC5MMSConn _4C


The DeviceNet straight 5-pin open plug to 5-pin micro male connector can be used in place of the 5-position open style plugs for DeviceNet, making it easier to connect I/O modules to the network, as well as reducing potential for miswiring and saving wiring time.

The DeviceNet straight 5-pin open plug to 5-pin micro male connector is compatible with:


Cat. No. Description
1799-DNC5MMS Female Open-style DeviceNet Y Adapter (Qty. 5)
1799-DNC100MMS DeviceNet straight 5-pin open plug to 5-pin micro male connector (Qty. 100)
  
 

For More Information

These and other publications are available for download from the Rockwell Automation Literature Library.

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