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Allen Bradley - PLC

PLC 5

The wide variety of controllers in the PLC-5 product lineup allows you to select the unit that works best with your application’s requirements. Controllers are available with user memory capacity ranging from 8K words up to 100K words. If you require a compact system, you can use the controller that best matches your requirements and is able to operate while only drawing minimal power from your system. The controllers are further offered with a variety of communication ports that you can select from depending if your system uses the Data Highway Plus or Ethernet network. The 1785-ENET module can be used to provide Ethernet capability to PLC-5 controllers that do not have it built in. The 1785-BCM module provides redundancy for any Programmable Controller module operating a critical function in your system. If your system requires high-speed I/O updates, the controllers support establishing an Extended-local I/O link that uses the 1771-ALX adapter module to provide fast scan and update times compared to remote I/O links. The PLC-5 series includes high-resolution isolated analog input and output modules in the N-series of PLC-5 controllers. You can use these modules to monitor your system’s parameters and have current, voltage, and temperature information available in a digital format that can be monitored on a computer or used as digital outputs for system control. Specialized modules are also available, including high-speed counter modules designed for industrial use, Thermocouple and RTD modules, and linear positioning modules for use in servo motor and hydraulic control systems. The power supply modules can be connected directly to the chassis and also support cable connections for applications with limited space. If your system involves multiple controllers and has a high current requirement, battery modules with parallel capability are also offered as part of this product line. Power supplies are available with AC and DC variants and include built-in fuses to protect your system from damage. The product lineup also includes adapters and PIC cards for connecting computers to PLC controllers with DH+ and DeviceNet networks. 1771 chassis are available in a range of sizes, allowing them to house as many modules as you require while still maintaining a small footprint. Chassis are also available with integrated power supplies and adapters for an even more compact package. If your system requires high-speed I/O updates, the controllers support establishing an Extended-local I/O link that uses the 1771-ALX adapter module to provide fast scan and update times compared to remote I/O links. The PLC-5 series includes high-resolution isolated analog input and output modules in the N-series of PLC-5 controllers. You can use these modules to monitor your system’s parameters and have current, voltage, and temperature information available in a digital format that can be monitored on a computer or used as digital outputs for system control. Specialized modules are also available, including high-speed counter modules designed for industrial use, Thermocouple and RTD modules, and linear positioning modules for use in servo motor and hydraulic control systems. The power supply modules can be connected directly to the chassis and also support cable connections for applications with limited space. If your system involves multiple controllers and has a high current requirement, battery modules with parallel capability are also offered as part of this product line. Power supplies are available with AC and DC variants and include built-in fuses to protect your system from damage. The product lineup also includes adapters and PIC cards for connecting computers to PLC-controllers with DH+ and DeviceNet networks.

PLC 5 Selection Guide

Industrialization brought about an increase in productivity and efficiency. Accordingly, many different types of programmable logic controllers (PLCs) were developed to suit every possible need. Each has its pros and cons; one well-known model from Allen Bradley is the PLC-5. The PLC-5 features are highlighted below.

PLC 5 Overview

A PLC-5 control system requires a minimum of one I/O module and Controller. The Controller requires specific communication ports. All controllers (regardless of model) come with interfaces for the included external remote I/O scanners. This makes it possible to monitor and control outlying locations without physically going there. 

Some models also come equipped with embedded internal remote I/O scanner connections. In contrast, others feature connection points through ControlNet or DeviceNet systems—giving one up to four options per type of connection when configuring one's personalized PLC-5 configuration. One needs either a 1771-SDN DeviceNet Scanner Module or 1771-ACN15 I/O Adapter Module installed on each side (remotely or locally). With either the SDN or ACN system, one can monitor and access up to sixteen separate devices simultaneously.

The PLC-5 Programmable Controller serves as the center for all Control Architectures. This powerful machine can connect systems to networks such as ControlNet, EtherNet/IP, or DeviceNet. These controllers have different inputs so that they can utilize whichever network they need for a specific application.

Features of a PLC 5 Controller

High-speed, single-slot PLC-5 controllers come equipped with many ways of processing and carrying out information. If one is looking for a controller that can handle large sequential or regulatory control apps along with unique I/O demands - the Standard PLC-5 controller can be a good option. However, if one wants to communicate using the same essential tools with other devices or interfaces, then use an Enhanced PLC-5 controller. No matter which one is chosen by the user, they all share the same impressive list of capabilities, making them all perfect!

Various PLC 5 Controllers

Enhanced PLC 5 Controllers

All Enhanced PLC-5 Controllers feature Data Highway Plus or Remote I/O ports, enabling them to communicate one-on-one with other devices. Real-time data exchange is possible, allowing operators to monitor and control all process aspects.

EtherNet PLC 5 Controllers

These controllers have been seamlessly integrated into an industry-standard EtherNet/IP system via the Ethernet PLC-5 controller, providing a versatile and open solution for every business. One can quickly do anything from production management to executive summaries of process information due to the Ethernet PLC-5 controllers' internet-friendly capabilities. These capabilities ensure that every corner of one's company is aware of what is always happening. With access to detailed diagnostics made possible by the Web server, there is no longer any need for speculation. This is supported by SNMP and DNS as well.

ControlNet PLC 5 Controllers

These controllers offer full ControlNet capabilities to control and manage automation devices. With a 5Mbps network connection, ControlNet provides reliable and consistent peer-to-peer communication and I/O access. One ControlNet Network can include many Controller units - each managing its hardware - which interact with one another for shared tasks. For example, one I/O node could provide input to multiple controllers simultaneously.

Protected PLC 5 Controllers

These controllers allow for selective guarding of controller memory and input, limiting access to critical points in programming codes and a program's accessibility. This type of protection is identifiable by its distinctive safety-yellow labeling. Use either System Administrator Rights or the appropriate Role (e.g., Plant Engineer) assigned through Programming Tools to control which users have access to which sets of areas on the system (including Communication Channels and Nodes connected via DH+, ControlNet Networks, Program Files, and Data Files, Remote Nodes). The Password Protection of other PLC-5 Controllers does not provide as high a level of security as the Protected variant; however, Extra Software explicitly designed for Clutch/Brake Applications is included with this Model from Rockwell Automation.

I/O Modules

Allen Bradley/Rockwell Automation has supplied over three million of its I/O modules to customers worldwide. There are many types of I/O module options, including block-based, modular-distributed, and chassis-based to select from. Selecting an appropriate module type might be difficult initially, but one can find guidance in the Allen Bradley I/O Module Brochure.

1771 I/O Modules

Digital, analog, and customized configurations are just a few options for the 1771 IO modules. With the help of these modules, sensors or actuators may be connected to power sources that use alternating current (AC) and direct current (DC). Up to 32 IO points per module are the maximum I/O density that users can choose. This covers all signals, from analog or output signals to direct thermocouple or RTD temperature input signals. PLC-5 controllers are compatible with the 1771 IO across local I/O, remote I/O, extended-local I/O, and ControlNet networks, so individuals may use them on whatever system they wish.

1746 I/O Modules

The 1746 I/O modules (SLC 500 I/O) provide a cost-effective remote I/O option. It is recommended to use an SLC 500 remote I/O module (1747-ASB) or ControlNet adapter module to link 1746 I/O modules directly to the PLC-5 system (1747-ACN15 or -ACNR15). Features of 1746 I/O modules include:

  • High-density point modules
  • 16-point modules
  • Removable terminal blocks

The industrial design includes Optical Isolation and Input Filtering. PLC-5 controllers support ControlNet and 1746 I/O via Remote IO.

Additional I/O Modules: Encompass Partners Program

Rockwell Automation's third-party product is referencing the program Encompass Partners. It has been created to improve the benefits of its products while also focusing on high-level technologies through new application development opportunities. These third parties can bring out features and functions not included in Rockwell Automation Products.

Network Communications

Network capability allows for quick and efficient data transmission to all devices. This includes Ethernet, control net, and device net connections - each used depending on the requirements needed.

  1. Ethernet/IP functions as a network connection if the system demands high-speed information transmission among multiple computers, an intranet connection, and program maintenance.
  2. Control Net connects to other controllers and I/O devices fast enough to handle high-speed transfers without latency or delay - whether one wants it for deterministic reliability or ease of use in maintaining programs over long distances.
  3. The DeviceNet network can be used if the system requires connections of low-level physical plant controllers instead of using other hardware bridges such as I/O modules. Additionally, the DeviceNet network is feasible when the application requires fault detection, improved data collection, reduced wiring, and less start-up time.
  4. If the system requires plant-wide and cell-level data interchange with program maintenance, use Data Highway Plus as the network connection.
  5. If the system needs connections between controllers and I/O adapters, Remote I/O as network communication is employed. A Remote I/O network connection can be used if the application requires distributed controllers, each of which has its own I/O and interacts with a supervisory controller.
  6. Use a Serial Network as a network connection if the system needs to send or receive messages with ASCII characters. When an application requires modems and SCADA, a serial network is employed as a method of network communication.

PLC 5 Ethernet Interface Module

To provide further Ethernet connection, any Enhanced PLC-5 series B or later Controller, Ethernet PLC-5 controller, or ControlNet PLC-5 controller can be fitted with the PLC-5 Ethernet Interface Module (1785-ENET), which is a single-slot module. Businesses can utilize standard Ethernet or Internet access to manage and monitor production using the Ethernet interface module's integrated communication features. Users seeking executive summaries of process information have quick access using a web browser.

ControlNet Network

ControlNet PLC-5 controllers have integrated ControlNet connection capabilities for processing information and controls. On a 5 Mbps network, the ControlNet network offers repeatable and deterministic peer-to-peer communications and I/O control. This makes it possible to have many ControlNet PLC-5 controllers on the same System Network, each of which can manage its own I/O. Even if configuration settings in the program did not previously state it, if one Controller is getting input data from an Input Device or Object Node, it would also be able to convey that data to another controller that requires this sort of data received.

DeviceNet Network

The 1771-SDN DeviceNet Scanner Module acts as an interface between DeviceNet devices and a PLC-5 Controller, allowing it to communicate with DeviceNet devices over the network to:

  • Read and write input/outputs
  • Download Configuration Data
  • Monitor the Operational Status

A single slot module can reside in either a 1771 I/O Chassis containing a PLC-5 controller, or one remotely connected via an extended local I/O link, remote I/O link, or Control Networked to said controller. The number of DeviceNet scanners is limited by the chassis size, available memory, and power supply capacity when residing in the same I/O chassis.

Serial Network

For RS-232, RS-423, or RS-422A compliant serial connection, the PLC-5 serial port may be set up. It may be used to link devices that transmit and receive ASCII characters using an ASCII terminal or printer, and/or utilize the DF1 protocol, such as communications modules, modems, programming workstations, and other serial devices.

The serial port employs the DF1 protocol when set for System mode. System Mode can be used to connect with other devices through the Serial Link.

Programs for SCADA systems can be launched on the serial port while in System Mode. Users may now monitor and control little chores via serial link connection between the locations of the master and enslaved individual. PLC BASIC modules take up a single slot in a 1771 I/O chassis, and they run via user-written BASIC and C applications. These programs enable communication between a PLC-5 Controller, 1771 Backplane, and Remote RS-232 Devices since they are not dependent on the system's PLC-5 Controller. The 1771-KE and 1771kf communication controller modules connect intelligent RS232 devices to Data Highway. Both modules provide users with the option between the Full Duplex and Half Duplex protocols for usage on the RS-232C Link. Through a Db-485 Port, the module may connect with a Remote SLC Controller or Device on the Db-485 Network.

Data Highway Plus

The Data Highway Plus (DH+) network is a robust way of connecting all company assets, whether they are located at headquarters or on the manufacturing floor. Not only does it allow one to update the machines remotely, but it also facilitates collaboration between programmers who are working with different models and locations. One of its most outstanding features is that it supports many topologies: daisy chain and trunkline dropline are two examples.

Remote I/O

The magnificence and durability of this technology are what make it such a staple in industrial automation. It provides 1771 input/output connections and supports many Rockwell Automation or 3rd-party compatible products - including simple I/O with controllers and interfaces, even complicated setups involving different types of machinery. This tool benefits businesses tremendously because they can save installation time, startup times, and maintenance costs when they use the remote data system rather than wire directly to a central I/O unit. Pass-Through enables devices on an external network like Ethernet, ControlNet, or DH+ to remotely adjust them from one location.

Browse our selection of PLC 5 units

AutomationStop.com's online catalog offers one of the largest selections of preowned PLC 5 units in the world.

1785-V40B

The 1785-V40B is a PLC-5 processor module. It has 48K words of available user memory and supports up to 1920 I/O connections. It comes with 4 DH+ ports and can connect to 60 Remote chassis with 15 I/O racks. The module has a typical input current draw of 2.9 amperes from the backplane.

1785-V40V

The 1785-V40V is a PLC-5 processor from the PLC-5 series of products. This device was designed and manufactured by Allen Bradley. It was a memory capacity of 48,000 words of SRAM. Additionally, the 1785-V40V has four (4) DH+/Remote I/O ports for communications purposes.

1785-V80B

The 1785-V80B is a VME processor, and it is a part of the PLC-5 series of products manufactured by Allen Bradley. This device has a maximum memory capacity of 100,000 words with a maximum capacity of 32,000 words per data table file. The 1785-V80B requires 2.5 amperes at 5 volts direct current (DC) from the backplane. It has a maximum total I/O of 2944. This processor has an RS-232 port for communications purposes.

1785-LT4

Product number 1785-LT4 is a processor module designed by Allen Bradley as part of the PLC-5 line of products. The backplane requirement for this unit is 2.5 amperes at 5 volts direct current (DC). This module has a maximum user memory of 6K words. It also has a maximum analog I/O capacity of 256.

1785-KA5P

Allen Bradley manufactured the 1785-KA5P. It is a panel-mounted communication module that enables devices on the Data Highway Plus (DH+) network to connect with devices on the RS-485 network. The 1785-KA5P module contains a 9-Pin D-shell connection, an 8-Pin modular connector, and a 6-Pin phoenix port, as well as a 5-Volt DC external power connection.

2760-RB

The 2760-RB is a flexible interface module that was manufactured by Allen Bradley as part of the PLC-5 series of products.  This module has two (2) connection slots and can be installed in a 1771 I/O rack. The 2760-RB has RS-485, RS-422, and RS-232 network ports. It requires 1.28 amperes of input current and an input voltage of 5 volts DC to operate properly.

3100-MCM

The 3100-MCM is a Modbus communication interface module that provides master/slave communication.  It operates with modules from the PLC-2, PLC-3, and PLC-5 series of products. This module can be used as a Modbus master or a Modbus slave device. The 3100-MCM module has a total of two (2) serial ports. It has a backplane current load rated as 0.65 amperes at 5 volts DC. This module can be mounted in a local or remote rack using Remote I/O.

3150-MCM

The 3150-MCM is a Modbus communications module. This module allows 1771 and 1746 I/O modules to act as Master or Slave devices on the Modbus network. It is able to store and transfer up to 4000 registers. It supports RS-232C, RS-422, and RS-485 and supports 32 slave devices on each port. The backplane current draw is rated at 800 milliamperes at 5 volts DC.

MVI71-GSC

Product number MVI71-GSC is a generic serial communication module. It was produced by ProSoft Technology and is compatible with the PLC lines of products. The backplane current load of this unit is 800 milliamperes at 5 volts. The MVI71-GSC may be installed on a 1771 backplane and it only takes up one (1) slot.

MVI71-MCM

Catalog number MVI71-MCM is a Modbus communication module belonging to the PLC platform. This is a product of ProSoft Technology. It is a single-slot device that is compatible with the 1771 backplane. The MVI71-MCM has a backplane current load of 800 milliamperes at 5 volts. This device utilizes Ladder Logic to transfer data between the module and the processor.

MVI71-MNET

The MVI71-MNET is a Modbus TCP/IP interface module. This module connects to PLC processors using the built-in 10/100 Megabit Ethernet port and allows them to connect to Modbus devices. It occupies a single slot and is configured as an I/O module in the 1771 chassis. The module requires 800 milliamperes from the backplane.

1771-ACNR15

The 1771-ACNR15 is a ControlNet redundant adapter module. This device may be used to connect any 1771 I/O module to the ControlNet network. It uses an RG-6 coaxial interconnect cable. The module’s dual cable redundant media provides a better network signal over conventional adapters. The backplane current rating of this device is 1.0 ampere at 5 volts. Additionally, the power dissipation is rated as 5 watts, while the thermal dissipation is rated as 17.06 BTU/hr.

1771-AF1

The 1771-AF1 is a fiber-optic convertor module. The module is used to connect 1771 devices via a duplex fiber-optic cable and can also function as a repeater for long-distance connections. This stand-alone module requires a separate 5-volt DC power supply at 1 ampere. This device uses the terminal block for wire connections.

1771-E1C

The 1771-E1C is an input expander module belonging to the PLC-5 line of products manufactured by Allen Bradley. This product has eight (8) single-ended input channels with twelve (12) bits. This unit has four (4) selectable input voltage ranges, which include 0 to 10 volts DC, 0 to 5 volts DC, -10 to 10 volts DC, and 1 to 5 volts DC. In addition to that, it has three (3) selectable input current ranges, which include 0 to 20 milliamperes, 4 to 20 milliamperes, and -20 to 20 milliamperes.

1771-IE

Catalog number 1771-IE is an analog input module that was produced by Allen Bradley. This module has eight (8) single-ended inputs. The nominal input ranges of this module include 1 to 5 volts, 0 to 5 volts, 0 to 10 volts, -10 to 10 volts, 0 to 20 milliamperes, 4 to 20 milliamperes, and -20 to 20 milliamperes. The 1771-IE's electrical-optical isolation rating, between the input circuit and the control logic, is 1500 volts. Additionally, this product has a backplane current requirement of 400 milliamperes at 5 volts DC.

1771-IE04

Product number 1771-IE04 is an analog input module that belongs to the PLC-5 line of products. It was designed by Allen Bradley. Using block transfer programming, this module connects with analog inputs and PLC processor modules. The operating voltage of this product range from 92 to 138 volts AC/DC. Additionally, the maximum AC/DC off-state current of the 1771-IE04 is rated at 1.7 milliamperes.

1771-IF

Catalog number 1771-IF is an Allen Bradley 12-bit analog input module assembly. This unit has eight (8) single-ended input channels. The nominal input voltage ranges include +1 to +5 volts DC, 0 to -5 volts DC -10 to +10 volts DC, and 0 to -10 volts DC. Additionally, the nominal input current ranges include +4 to +20 milliamperes, 0 to +20 milliamperes, and -20 to +20 milliamperes. The power supply current requirement of the 1771-IF is rated at 1.3 amperes.

1771-ISC

The 1771-ISC is a specialized I/O module that was manufactured by Allen Bradley as part of the PLC-5 line of products. This module is a single-slot device, meaning it takes up one slot within a chassis. It supports rack-based module functions and has a 5-volt DC voltage rating. The 1771-ISC does not have any outputs. However, it can support up to 72 inputs.

1771-OBDS

The 1771-OBDS is a DC output module. It features 16 non-isolated outputs with a voltage range of 10 to 60 Volts DC. This module is compatible with all 1771 universal chassis, except the -A1, -A2, and -A4 models. It has an input current draw of 400 milliamperes. The current rating for each output is 2 amperes for a total of 8 amperes per module. The surge current is rated at 4 amperes per output and 25 amperes per module for 10 milliseconds.

1771-ODC

The 1771-ODC is an Allen Bradley output module belonging to the Bulletin 1771 series of products. The operating voltage of this product ranges from 92 to 138 volts AC at a 47 to 63-hertz frequency. It has six (6) 120-volt AC isolated output channels. The 1771-ODC can draw up to 2 amperes of continuous output current per point without exceeding 6 amperes total.

1772-LN2

The 1772-LN2 is a mini-PLC-2 controller designed by Allen Bradley. It has a voltage range of 10 to 32 volts DC. This unit supports up to thirty-two (32) I/O channels and has a total of forty (40) terminals. The typical AC signal OFF delay is 29 milliseconds plus or minus 8 milliseconds, while the typical DC signal OFF delay is 30 milliseconds plus or minus 7 milliseconds.

1772-LZ

Part number 1772-LZ is a Mini-PLC-2/02 processor module without a power supply. It was designed by Allen Bradley. The required backplane current of this module is 1.25 amperes. It has a data table size of 48 to 1920 floating words. The memory size of the 1772-LZ is 16K 16-bit words of RAM.

1784-KT2

Product number 1784-KT2 is a communication interface module by Allen-Bradley. It enables IBM PS/2 compatible computers to communicate with PLC devices. It also enables all DH+ programmable controllers to connect. The 1784-KT2 has power requirements consisting of +5 volts DC at 0.25 amperes (1 watt) and +/-12 volts DC at 0.04 amperes (0.48 watts).

1785-O5G

Allen Bradley's 1785-O5G coprocessor interface module is part of the PLC-5 product line. It can handle up to 3072 analog I/O at once. The backplane current requirement for this device is 2.5 amperes at a voltage rated at 5 volts DC. The 1785-O5G has multiple scan times, which include 10 milliseconds at 57.6 kilobits per second, 7 milliseconds at 115.2 kilobits per second, and 3 milliseconds at 230.4 megabits per second.

1785-V30B

Catalog number 1785-V30B is a PLC-5/VME processor that was manufactured by Allen Bradley. This product has a maximum user memory of 32K words. The maximum total I/O of any mix for this unit is 896, while the maximum complementary total I/O is 896 in and 896 out. Additionally, the 1785-V30B supports a maximum of 896 analog I/O. This unit has two (2) DH+/Remote I/O ports and one (1) RS-232 port. The maximum backplane current load of the 1785-V30B is 3.0 amperes, while the typical backplane current load is 2.4 amperes.

1770-TA

The Allen-Bradley 1770-TA is a portable and adaptable programming industrial terminal that is part of the PLC-5 family of terminals. When providing different peripheral services, the 1770-TA is widely utilized with line printing, digital cassette recordings, and data cartridge recording devices. This terminal can display up to 24 lines of text with up to 80 characters per line.
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