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Allen Bradley - PLC

CompactLogix

The CompactLogix series is a Logix controller system made by the Allen Bradley corporation. This series is commonly used in medium and small industrial applications. In addition to that, these systems are used to control machine-level applications. Furthermore, the CompactLogix system is typically built by combining a controller with Input or Output modules and the DeviceNet communication network. Moreover, it is worth noting that the CompactLogix system from Allen Bradley provides cutting-edge control, along with Input or Output and communication in a small package. These controllers provide many benefits to any system they are incorporated in, such as higher performance, improved productivity, increased capacity, and even enhanced security. Based on the input type, output, memory type, communication module, enclosure type, and mounting options, it is manufactured with different specifications to meet different application needs. The Logix system includes a number of communication ports, including Ethernet/IP and ControlNet. These ports are associated with various networks. The built-in serial port allows anyone operating the CompactLogix controller system to connect additional add-on devices to the controller system. Furthermore, it must also be noted that local expansion modules are also supported by the Allen Bradley device. Aside from that, all controller devices have a reset button that clears the user programs from the internal memory if the controllers have problems starting up. Device-level ring, linear, and traditional star topologies are supported by the controllers. The CompactLogix series of controllers have many sub-series associated with it, such as CompactLogix 5480, CompactLogix 5380, Compact GuardLogix 5380, CompactLogix 5370, and much more.

CompactLogix (1769) Selection Guide

Allen-Bradley is the manufacturer of the CompactLogix (1769) platforms, which are designed to provide a single integrated control architecture, a common programming software environment, and communication support for sequential, motion, drives, and process control. A CompactLogix (1769) system uses connections to establish a communication link across multiple hardware platforms. For instance, a connection can be between a controller to local/remote I/O modules or between a controller to remote/local communication modules. These connections are resource allocations that provide more reliable communications between the hardware platforms than unconnected messages.

A typical 1769 CompactLogix system consists of a CompactLogix Controller within the 1769 series and 1769 Compact I/O modules. In such a system, the 1769 CompactLogix controller is always the leftmost module. The controller is required to be within four modules of the CompactLogix system power supply. Some 1769 I/O modules may be placed up to eight modules away from the system’s power supply.

Therefore, the 1769 Logix platform combines the benefits of a common network, a common control engine, and a common programming environment in a small footprint with exceptional performance. With the 1769 Compact I/O modules, the CompactLogix (1769) system can support simple to more complex Integrated Motions, with unprecedented scalability and power. The platform is ideal for providing Logix solutions to applications that require system-connected and standalone control over the EtherNet/IP, DeviceNet, or ControlNet networks.

Selection Criteria

To design a CompactLogix (1769) system, you will have to accurately select the following components, based on the requirements of your control application.

Compact I/O Modules

Allen-Bradley provides a variety of 1769 Compact I/O modules from which you can choose the modules best suited for the intended purpose of your CompactLogix (1769) system.  Some of the 1769 Compact I/O modules have field-side diagnostics, electronic fusing, or individually-isolated inputs and outputs. The available 1769 I/O modules include:

1769 Compact Digital AC Input Modules

There are three modules within this category. These modules include the 1769-IA8I module which has 8 individually isolated inputs with an input voltage rating of 100 volts AC or 120 volts AC, the 1769-IA16 module with 16 digital input circuits and an input voltage rating of 100 or 120 volts AC, and the 1769-IM12 module with 12 digital input channels and an input voltage rating of 200 or 240 volts AC.

1769 Compact Digital AC Output Modules

There are two modules available within this category. These modules include the 1769-OA8 module, which has 8 outputs channels and an output voltage ranging from 100 to 240 volts AC, and the 1769-OA16 module with 16 digital output channels and an output voltage ranging from 100 to 240 volts AC.

1769 Compact Digital DC Input Modules

This category of modules includes the 1769-IQ6XOW4 module with 6 digital input channels, the 1769-IQ16 module with 16 digital input channels, the 1769-IQ16F module with 16 high-speed input channels, the 1769-IQ32 module with 32 digital input channels, and the 1769-IQ32T module with 32 terminated input channels. All of these modules have an input voltage rating of 24 volts sink/source.

1769 Compact Digital DC Output Modules

The modules of this category include the 1769-OB8 with 8 digital output channels and an output voltage of 24 volts DC sourcing, the 1769-OB16 with 16 output channels and an output voltage of 24 volts DC sourcing, the 1769-OB16P with 16 protected output channels and an output voltage of 24 volts DC sourcing, the 1769-OB32 with 32 digital output channels with an output voltage of 24 volts DC sourcing, the 1769-OV16 with 16 digital output channels and an output voltage of 24 volts DC sinking, and the 1769-OV32T with 32 terminated output channels and an output voltage of 24 volts DC sinking.

1769 Compact Digital Contact Output Modules

This category includes the 1769-IQ6XOW4 with 4 digital output channels, the 1769-OW8 with 8 output channels, the 1769-OW8I with 8 individually isolated output channels, and the 1769-OW16 with 16 digital output channels. Each of these modules has an output voltage rated at 24 volts DC.

1769 Compact Analog Modules

There are a variety of modules within this category, from which you can select either general-purpose Analog I/O, RTD (Resistance Temperature Detector), or Thermocouple modules. They include the 1769-IF4 with 4 analog input channels and a 14-bit unipolar resolution, the 1769-IF4I with 4 individually isolated input channels with a 16-bit unipolar resolution, the 1769-IF8 with 8 input channels and a 16-bit unipolar resolution, the 1769-OF2 with 2 analog output channels and a 14-bit resolution, the 1769-OF4CI with 4 current-individually isolated output channels and a 16-bit unipolar resolution, and the 1769-OF4VI with 4 voltage-individually isolated output channels with a 16-bit unipolar resolution, as well as many more modules.

1769 Analog Thermocouple and RTD Modules

This category includes the 1769-IT6, which has 6 thermocouple input channels. To reduce the effects of electrical noise, this module should be installed at least two slots away from the AC (Alternating Current) power supplies. Additionally, this category has the 1769-IR6, which has 6 RTD input channels. The Analog-to-Digital Converter (ADC) of this module has an input filter and is configuration-dependent.

Please note that you should check if the selected 1769 compact output module requires surge suppression. Though, most of the 1769 output modules have in-built surge suppression systems to reduce/eliminate the effects of very high-voltage transients. If an output within your Logix platform is being used to control inductive devices such as induction motors, relays, solenoids, or motors, you should use an additional suppression device. The suppression device should be added directly across the coil of the inductive device being controlled.

Also, check the required accessories for your selected Compact I/O modules. They could include 1769 Expansion Cables, 1769 End Caps, 1769 Wiring Systems, Removable Terminal Kits, Communication I/O modules, and PanelConnect Modules for connecting Sensors.

Specialty I/O Modules

Also, when appropriate you can select Specialty 1769 I/O modules. The available specialty I/O modules within the 1769 series include:

High-Speed Counter Module

The 1769-HSC module supports 2 inputs and 4 outputs. You can use this module when you need a counter capable of reacting to high-speed input signals, or when you need to generate and rate pulse interval data. Also, if you need as many as 4 channels of count/pulse inputs or 2 channels of quadrature inputs, then the 1769-HSC module could be your ideal choice.

Address Reserve Module

You can use the 1769-ARM module to reserve a module slot. For example, after creating a user program for configuring the I/O modules, you can remove and replace any of the aforementioned I/O modules in the CompactLogix (1769) system and replace it with a 1769-ARM module.

Compact I/O to PowerFlex Drives Modules

The 1769-SMx modules in this category enable 1769 Compact I/O modules to be connected directly to PowerFlex drives. The 1769-SM1 is a 1769 Compact I/O to SCANport/DPI Module which connects to SCAN port-based Host devices such as 1336 and 1305 PLUS II drives, PowerFlex 7-Series drives, and other DPI-based Host devices. The 1769-SM2 is a 1769 Compact I/O to DSI/Modbus Module that connects to PowerFlex 4-Series drives and to various other Modbus RTU Slave drives, such as PowerFlex 7-series drives that have 20-COMM-H-RS485 HVAC adapters.

Communication Network

When you configure your CompactLogix (1769) system for information exchange between a range of I/O modules computing platforms, and operating systems, that becomes a communication network. Ensure you select the networks, communication interfaces, associated network equipment, and cables that are compatible with the components of your 1769 CompactLogix system.

  • EtherNet/IP (Ethernet Industrial Network Protocol): This is an open industrial-networking standard that supports real-time I/O implicit and explicit messaging. It uses off-the-shelf commercial Ethernet communication chips, equipment, and physical media. The EtherNet/IP network provides dual-port support, which embeds switch technology directly in the 1769 CompactLogix controller, enabling the controller to operate via linear, ring, or star EtherNet/IP topologies.
  • ControlNet: This is an open, state-of-the-art control network that allows intelligent, high-speed controllers to share real-time information required in high-throughput applications, such as supervisory control, operator interface, work-cell coordination, programming, remote device configuration, and troubleshooting.
  • DeviceNet: This is a low-level, low-cost network that provides connections between higher-level devices (i.e., computers and PLC controllers) and simple industrial devices (i.e., actuators and sensors), with a significant reduction in wiring. These connections enable a DeviceNet network to provide high-speed access to data from a wide range of plant-floor devices.

CompactLogix Controllers

A 1769 Logix Platform can only fit CompactLogix 5370-Series Controllers by Allen-Bradley/Rockwell Automation. These controllers can monitor and control the aforementioned 1769 Compact I/O modules across the 1769 CompactBus, and over remote I/O communication links. Also, the CompactLogix controllers can communicate with PLCs, computers, or other processors across EtherNet/IP, DeviceNet, ControlNet, and RS-232-C (DF1/DH-485 protocol) networks. The available controllers within the CompactLogix 5370-Series from which you can choose include:

CompactLogix 5370 L1 Controllers

To expand the scalability of the Logix series of controllers, the CompactLogix 5370 L1 Programmable Automation Controllers (PACs) are designed to provide reduced panel space and enable you to build a cost-effective and high-performance CompactLogix (1769) system. The available controllers within this Logix family include the 1769-L19ER-BB1B, the 1769-L18ERM-BB1B, 1769-L18ER-BB1B, and the 1769-L16ER-BB1B.

The CompactLogix 5370 L1 controllers consist of an Integrated Ethernet Switch and Dual Ethernet ports which allow support for Device Level Ring (DRL) network topologies. This simplifies the integration of components into your CompactLogix (1769) system. DRL connectivity allows replacements of individual I/O devices without compromising the production of the system being controlled and assists to increase network resiliency. The open socket capability of L1 controllers allows support for Modbus TCP and other devices, like servers, printers, and barcode readers, for example.

These controllers support up to 2 axes of Integrated Motion on EtherNet/IP with Kinetix 350-Series drives, for maximized scalability. Please note that only the 1769-L18ERM-BB1B controller supports Integrated Motion EtherNet/IP networks. The CompactLogix 5370 L1 controllers include up to a 2GB SD (Secure Digital) card for fast program restoration and saving. They have a built-in energy storage system, which eliminates the need for Lithium-ion batteries. They are ideal for mid-size to small control applications which require I/O point counts and low axis motion, as they support up to 2 axes of Kinematics and are used in simple articulated robotics.

CompactLogix 5370 L2 Controllers

These are Programmable Automation Controllers (PACs) by Allen-Bradley/Rockwell Automation. The available controllers within this series include the 1769-L24ER-QB1B, the 1769-L24ER-QBFC1B, and the 1769-L27ERM-QBFC1B. These L2 controllers have an Integrated Ethernet Switch and dual Ethernet ports which support Device Level Ring (DLR) network topologies. This simplifies the integration of components in your CompactLogix (1769) system, by reducing the number of Ethernet switches needed, reducing the overall cost of your control system. Also, the 1769-L27ERM-QBFC1B controller supports up to 4 axes of Integrated Motion on the EtherNet/IP network. Together with the Kinetix 350 drives, this controller provides cost-effective, scalable motion.

In addition, the L2 controllers support the reuse of existing 1769 Compact I/O modules. They consist of a removable 1GB SD card for nonvolatile memory storage which improves data integrity. They also provide other memory options of up to 1MB. Their higher resolution analog capability readily supports RTD and Thermocouple analog inputs. With their open socket capability, they can support Modbus TCP and other devices like barcode readers, printers, and servers. They also support the DeviceNet network through a 1769-SDN scanner module.

CompactLogix 5370 L3 Controllers

These are Programmable Automation Controllers (PAC) designed by Allen-Bradley/Rockwell Automation to meet the growing user needs for high-performance and affordable controller packages. They include the 1769-L30ER, the 1769 -L30ERM, the 1769-L30ER-NSE, the 1769-L33ER, the 1769-L33ERM, the 1769-L36ERM, the 1769-L37ERM, and the 1769 -L38ERM.

These controllers also have an Integrated Ethernet switch and Dual Ethernet ports, which support Device Level Ring (DLR) network topologies. They provide up to 16 axes of Integrated Motion on EtherNet/IP, with Kinetix 350-Series drives, thus providing cost-effective scalable motion solutions. Note that only the 1769-L36ERM, 1769-L33ERM, and 1769-L30ERM controllers support Integrated Motion on EtherNet/IP networks.

The L3 controllers provide a removable 1GB secure digital (SD) card for nonvolatile memory storage, which improves data integrity. They also provide flexible memory options of up to 3MB. They support the reuse of existing Compact 1769 I/O modules, and with their open socket capabilities, they allow the use of Modbus TCP. These controllers do not require a Lithium-ion battery, as they have an in-built energy storage module. However, the NSE (No Stored Energy) version of the L3 controllers, provides additional features for hazardous industrial environments, such as in oil, gas, and mining industries. Overall, CompactLogix 5370 L3 controllers are ideal for control applications ranging from small standalone equipment to high-performance process skids, indexing tables, case packers, and more.

CompactLogix Controllers Communication Options

Please note that for you to configure your CompactLogix (1769) system for information exchange, you need to select an appropriate CompactLogix 5370 controller with the necessary integrated communications or with the appropriate communication module for the networks that meet your system needs. The separate interface communication module will allow you to connect to different networks.

The information below provides an overview of various CompactLogix 5370 controllers and Communication networks which you can select to meet specific application requirements for your CompactLogix (1769) system.

If your application requires Internet/Intranet connection, plant management, regular data exchange, data collection and configuration on a high-speed network, and time-critical applications that have no established schedule, as well as use the EtherNet/IP network, the CompactLogix 5370 Controller that is recommended for you is the 1769-L32E controller, the 1769-L35E controller, or the 1769-L31 controller with the 1761-NET-ENI.

If your application requires high-speed transfer of time-critical data between 1769 Compact I/O devices and 1769 Controllers, repeatable and deterministic data delivery, media redundancy and redundant controller systems, intrinsic safety, as well as uses the ControlNet network, the recommended CompactLogix 5370 controllers are the 1769-L32C and 1769-L35CR.

If your application requires direct connections of low-level devices to plant floor controllers without Compact I/O modules interfacing, data sent as required, more diagnostics for fault detection and improved data collection, reduced wiring, reduced start-up time than a conventional, hard-wired system, and uses the DeviceNet Network, the recommended CompactLogix 5370 controllers include the 1769-SDN scanner, the 1769-ADN adapter, and the 1761-NET-DNI interface.

Power Supplies

If the power consumption of your CompactLogix (1769) system exceeds the maximum rating of a single power supply, you can install additional power supplies and power banks. The available power supplies include the 1769-PA2 compact 124/240 volts AC expansion power supply, the 1769-PB2 compact 24 volts DC expansion power supply, the 1769-PA4 compact 124/240 volts AC expansion power supply, and the 1769-PB4 compact 24 volts DC expansion power supply.

Please note that the power supplies for the 1769 Compact I/O modules distribute power from either side of the power supply. For example, 2 amperes at 5 volts DC power supply (1769-PA2, 1769-PB2) can provide 1 ampere to the left side of the power supply and 1 ampere to the right side. Similarly, a 4-ampere at 5 volts DC power supply (1769-PA4, 1769-PB4) can provide 2 amperes to the left side of the power supply and 2 amperes to the right side.

Conclusion

When designing a 1769 CompactLogix system, you will need to select the appropriate Compact I/O modules, Communication Networks, CompactLogix 5370 controllers, and Power Supplies. This article provides detailed guidelines to assist you to select each of the aforementioned elements, to meet the application requirements of your 1769 Logix platform.

Browse our selection of CompactLogix units

AutomationStop.com's online catalog offers one of the largest selections of preowned CompactLogix units in the world.

MVI69-MCM

Manufactured by ProSoft Technology, product number MVI69-MCM is a Modbus communication module. This module is used as an I/O module between the Modbus network and the CompactLogix or MicroLogix backplane. The current load of this module is 800 milliamperes max at 5 volts direct current (DC).

MVI69-MNET

The MVI69-MNET is a communication module that ProSoft Technology develops. This CompactLogix module is a TCP/IP module that can connect CompactLogix and MicroLogix processors. The current requirement for this Allen Bradley module is 800 mA at 5VDC. It supports ladder logic, 5000 registers, and 100 client commands.

MVI69-PDPMV1

The Prosoft MVI69-PDPMV1 is a master communication module compatible with MicroLogix and CompactLogix devices. This network module can connect with up to 125 slaves and can manage up to 1536 cyclic bytes of data input and output. Its main interface is a CFG port, and it includes vivid LED indicators for operational elements such as module status and others.

MVI69E-MBS

The MVI69E-MBS is a Modbus serial enhanced communication module used with a CompactLogix platform. It allows CompactLogix or MicroLogix processors to communicate with Modbus protocol devices. It consumes 500mA of power at 5 VDC. The unit serves as an input and output communication module for these two types of devices, and it can hold databases full of data.

MVI69L-MBTCP

The ProSoft MVI69L-MBTCP is a CompactLogix Modbus TCP/IP light communication module with 240/240 16-bit integers I/O size. It supports 10 Modbus connections, 16 commands per connection. The module's current rating is 450 milliamperes at 5 volts DC, and it has a minimum of 128 MB of RAM and 100 MB of free hard drive space.

PS69-DPM

The CompactLogix PS69-DPM is a master network interface module. It has a single slot compatible with the 1769 backplane and enables communication between the controller and the Profibus. It has a power rating of 260mA at 5V and can tolerate +/- 5% deviations. PROFIBUS DP-V1 is used to connect at a speed of 12 Mbps.

PS69-DPS

The Prosoft PS69-DPS is a  PROFIBUS communication interface module that enables CompactLogix and MicroLogix controllers to use the PROFIBUS DP V0/V1 networking protocol in various industrial automation systems. It takes up one slot and must be placed at least 6 modules away from the power supply units. It has many functions and can handle I/O and send and receive messages.
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