1785-L20B | Allen-Bradley PLC-5/20 Controller, 16K Word SRAM
1785-L20B | Allen-Bradley PLC-5/20 Controller, 16K Word SRAM
Part #: 1785-L20B Manufactured by: Allen-Bradley

1785-L20B | Allen-Bradley PLC-5/20 Controller, 16K Word SRAM

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$1,655.00
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$1,655.00
Regular price
Never Used Surplus
184 in Stock
Product Overview
Allen Bradley PLC 5 PLC-5/20 Standard Processor, 512 Max Analog I/O, 16 Kilowords, 2.3 Amperes Backplane Current (at 5 Volts)
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1785-L20B | Allen-Bradley PLC-5/20 Controller, 16K Word SRAM
    1785-L20B | Allen-Bradley PLC-5/20 Controller, 16K Word SRAM
1785-L20B | Allen-Bradley PLC-5/20 Controller, 16K Word SRAM
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Product Description P/N: 1785-L20B

Description / Specifications

Description 

The Allen-Bradley 1785-L20B is an Allen-Bradley PLC5 Controller. This controller has 16K words of user memory, supports 512 (any mix) or 512 in + 512 out (complementary). It has embedded communication ports such as One (1) DH+ (Fixed), One (1) DH+/Remote I/O (Adapter or Scanner) One (1) serial port, configurable for RS-232 and 423 and RS-422A standards.


Technical Specifications 


Brand Allen-Bradley
Manufacturer Rockwell Automation
Part Number 1785-L20B
Product Type Programmable Logic Controller
Backplane current load 2.3 A
Embedded Communication interfaces 1 DH+ (Fixed) 1 DH+/Remote I/O (Adapter or Scanner) 1 serial port, configurable for RS-232 and 423 and RS-422A standards
Memory 16 Kwords
Battery 1770-XYC
Maximum Number of I/O Racks 4 (0-3)
Remote I/O 12 chassis
Operating Temperature EC 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): 0...60 o C (32...140 o F)
Non-Operating Temperature IEC 60068-2-1 (Test Ab, Un-packaged Nonoperating Cold), IEC 60068-2-2 (Test Bc, Un-packaged Nonoperating Dry Heat), IEC 60068-2-14 (Test Na, Un- packaged Nonoperating Thermal Shock): –40...85 o C (– 40...185 o F)
Power Dissipation 12 W
Power Supply 1771-P4S, -P6S, -P4S1, -P6S1
Product Family PLC5
Module Type Standard Processor
Processor PLC-5/20
Max User Memory Words 16 Kilowords
Battery-Backed Static RAM Yes
EEPROM Program Backup Option (using 1785-ME16, -ME32, -ME64, and -M100) Yes
Protected Memory No
Max Total I/O 512 (any mix) or 512 in + 512 out (complementary)
I/O Scan Time Per Rack 10 ms at 57.6 kbits/s, 7 ms at 115.2 kbits/s, 3 ms at 230.4 mbits/s
Max I/O Chassis Total 13
Max I/O Chassis Extended Local 0
Max I/O Chassis Universal Remote 12
RS-232-C/422-A/423- A Ports 1
Control Coprocessor Expansion Port Yes

  


Information About 1785-L20B

The Allen-Bradley 1785-L20B is a Programmable Logic Controller (PLC) module. This product is a PLC controller that belongs to the legacy PLC5 product family.

The 1785-L20B features a variety of embedded communication ports such as One (1) DH+ (Fixed), One (1) DH+/Remote I/O (Adapter or Scanner) One (1) serial port, configurable for RS-232 and 423 and RS-422A standards. These communications ports support individual configuration and functions independently from each other. They can be used simultaneously to implement the intended functions such as communication to compatible partner devices for data exchanges, communication with visualization devices and interaction with programming workstations.

The 1785-L20B’s embedded memory amounts to 16Kwords. This memory is a volatile memory, maintained by a lithium battery with catalog number 1770-XYC. This controller supports implementation of distributed I/O architecture via the DH+ or Remote I/O protocol. It may also be optionally installed with an Ethernet interface module for implementation of distributed I/O systems over Ethernet. Up to Twelve (12) remote I/O chassis may be installed with this controller.

The 1785-L20B Controller supports installation of an Electronically Erasable Programmable Read Only Memory (EEPROM) as a memory backup device. Memory options include 1785-ME16 with 16Kwords, 1785-ME32 with 32k Words, 1785-ME64 with 64 Kwords and 1785-ME100 with 100Kwords.

The 1785-L20B has one built-in port dedicated for Data Highway Plus (DH+) communication interface marked as channel 1A. It also has One (1) combo port that can be configured both as DH+ or Remote I/O (adapter or scanner) marked as channel 1B. DH+ communication can be used both for remote programming and monitoring, creating peer-to-peer communication networks between other PLC-5 controllers and communication with visualization systems. Remote I/O connection is used for real time data exchange between the controller and an I/O operator interface and other devices. Additionally, the 1785-L20B controller has a 25-pin connector labeled as channel 0 which is an optically isolated EIA RS232C port. This port supports ASCII and DF1 full-duplex, half-duplex master and half-duplex slave protocols. The controller’s other communication port includes an 8-pin mini DIN connector marked as channel 1A. which functions as DH+ programming terminal with parallel connection to channel 1A.

Channel 1B on 1785-L20B can be configured as remote I/O scanner or remote I/O adapter communication. The remote I/O scanner mode is used to read and write I/O information between a controller and remote I/O device. When in this mode, 1785-L20B is a supervisory controller for other controllers that are in adapter mode and remote I/O adapter modules. When channel 1B is configured as remote I/O adapter mode, the controller monitors and controls its controller-resident local I/O while communicating with the supervisory controller via a remote link. On the 1785-L20B, the Data Highway Plus (DH+) link can be used on channel 1A (this channel is dedicated to this type of communication), and on channel 1B. The maximum cable length for DH+ link depends on the used transmission rate. It is crucial that all devices on a DH+ link are configured to communicate at the same transmission rate. That length goes from a maximum of 3048 m for a speed of 57.6 kilobits per second to 762 m for a speed of 230.4 kilobits per second.

The 1785-L20B has several indicators on the front panel used for easy interaction with the user. Indicators are used for displaying various statuses of the controller. Indicator marked BATT is used for displaying the status of the battery (red when the battery is low). Indicator marked PROC indicates controller current mode, it is green when the controller is in RUN mode, and red when some fault exists. The FORCE indicator is colored amber when I/O forces are enabled. COMM indicator is linked with channel 0 communication status. The indicator is green when the channel is communicating. Channel 1A and 1B both have a dedicated status indicator.

A Three-position key-switch is provided for selecting the controller mode. Each position corresponds to one mode of the processor. RUN mode is used for running controller programs, outputs are enabled. In RUN mode, I/O can be forced and data table values can be edited. Programs can be saved. In program mode (PROG position of key switch) outputs are disabled, and ladder files, SFC files or data files can be created, modified and deleted. It is possible to download and upload transfers with a memory module. Programs can be saved and restored. The third mode of the 1785-L20B processor work is remote mode, which is selected by moving the key switch to REM position. In this mode, it is possible to choose between three sub-modes: remote program, remote test, and remote run. When the processor is in remote run sub-mode, outputs are enabled and programs can be saved, restored, and edited while operating. Remote program sub-mode is the same as normal program mode. While in remote test sub-mode, ladder programs can be executed with outputs disabled, ladder programs or data files cannot be created or deleted. Programs can be saved, restored and edited while operating.

The 1785-L20B has 16000 words of user memory space. The controller’s RAM has a battery backup. For program backups, an EEPROM module can be installed in the slot situated on the front panel. Memory modules with various capacities are available. The total number of I/O (including local I/O and universal remote I/O combined) is 512 with any mix. The 512 inputs and 512 outputs are complementary, meaning that in order to use this much I/O, pairs of modules must have duplicate addresses. The maximum number of analog I/O is 512. 1785-L20B can utilize a total of 13 I/O chassis, and among them, 12 can be universal remote I/O chassis. The backplane current load of the 1785-L20B is 2.3 Amps at 5 Volts. 1785-L20B is not capable of connecting to an extended local I/O chassis.






Manufacturer information

Allen‑Bradley components, integrated control and information solutions are built for demanding industrial applications. We integrate control and information across the enterprise to make you as productive as possible.

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IQElectro 2 Year Warranty

IQElectro offers a 2-Year Warranty on all our products. This complimentary two-year warranty ensures that every purchase from IQElectro is a secure investment in the future of your company.
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IQElectro LLC (IQElectro) is NOT an Authorized Distributor or in any way affiliated with Rockwell Automation, Siemens, or any other Manufacturers. IQElectro is NOT an Authorized Dealer of this product. The product may be of older version, date codes, or design than that available from authorized dealers. As IQElectro is not an authorized dealer of this product, the Original Manufacturer's Warranty and Support DO NOT apply. IQElectro sells SURPLUS only and DOES NOT SELL SOFTWARE or FIRMWARE licenses. Some hardware products may contain software and firmware and may not be legally operated without first obtaining an appropriate license from the manufacturer. IQElectro makes no representation as to whether a product will or will not have software or firmware and, if it does, whether the software or firmware is the revision level that you need for your application. IQElectro also makes no representations as to your ability or right to download or otherwise obtain software or firmware for the product from the Original Manufacturer, its distributors, or any other source. IQElectro also makes no representations as to your right to install any such software or firmware on the product. IQElectro will not obtain or supply software or firmware on your behalf. It is your obligation to comply with the terms of any End-User License Agreement or similar document related to obtaining or installing software or firmware. Customer acknowledges and agrees that IQElectro DOES NOT provide any software, firmware, operating system, or right-to-use licenses with the products it sells. Customers understand and agree that proper software (firmware) licensing, maintenance, and upgrades are subject to the applicable manufacturer's Licensing Agreement or similar document. Disclaimer Policy.
Description / Specifications

Description 

The Allen-Bradley 1785-L20B is an Allen-Bradley PLC5 Controller. This controller has 16K words of user memory, supports 512 (any mix) or 512 in + 512 out (complementary). It has embedded communication ports such as One (1) DH+ (Fixed), One (1) DH+/Remote I/O (Adapter or Scanner) One (1) serial port, configurable for RS-232 and 423 and RS-422A standards.


Technical Specifications 


Brand Allen-Bradley
Manufacturer Rockwell Automation
Part Number 1785-L20B
Product Type Programmable Logic Controller
Backplane current load 2.3 A
Embedded Communication interfaces 1 DH+ (Fixed) 1 DH+/Remote I/O (Adapter or Scanner) 1 serial port, configurable for RS-232 and 423 and RS-422A standards
Memory 16 Kwords
Battery 1770-XYC
Maximum Number of I/O Racks 4 (0-3)
Remote I/O 12 chassis
Operating Temperature EC 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): 0...60 o C (32...140 o F)
Non-Operating Temperature IEC 60068-2-1 (Test Ab, Un-packaged Nonoperating Cold), IEC 60068-2-2 (Test Bc, Un-packaged Nonoperating Dry Heat), IEC 60068-2-14 (Test Na, Un- packaged Nonoperating Thermal Shock): –40...85 o C (– 40...185 o F)
Power Dissipation 12 W
Power Supply 1771-P4S, -P6S, -P4S1, -P6S1
Product Family PLC5
Module Type Standard Processor
Processor PLC-5/20
Max User Memory Words 16 Kilowords
Battery-Backed Static RAM Yes
EEPROM Program Backup Option (using 1785-ME16, -ME32, -ME64, and -M100) Yes
Protected Memory No
Max Total I/O 512 (any mix) or 512 in + 512 out (complementary)
I/O Scan Time Per Rack 10 ms at 57.6 kbits/s, 7 ms at 115.2 kbits/s, 3 ms at 230.4 mbits/s
Max I/O Chassis Total 13
Max I/O Chassis Extended Local 0
Max I/O Chassis Universal Remote 12
RS-232-C/422-A/423- A Ports 1
Control Coprocessor Expansion Port Yes

  


Information About 1785-L20B

The Allen-Bradley 1785-L20B is a Programmable Logic Controller (PLC) module. This product is a PLC controller that belongs to the legacy PLC5 product family.

The 1785-L20B features a variety of embedded communication ports such as One (1) DH+ (Fixed), One (1) DH+/Remote I/O (Adapter or Scanner) One (1) serial port, configurable for RS-232 and 423 and RS-422A standards. These communications ports support individual configuration and functions independently from each other. They can be used simultaneously to implement the intended functions such as communication to compatible partner devices for data exchanges, communication with visualization devices and interaction with programming workstations.

The 1785-L20B’s embedded memory amounts to 16Kwords. This memory is a volatile memory, maintained by a lithium battery with catalog number 1770-XYC. This controller supports implementation of distributed I/O architecture via the DH+ or Remote I/O protocol. It may also be optionally installed with an Ethernet interface module for implementation of distributed I/O systems over Ethernet. Up to Twelve (12) remote I/O chassis may be installed with this controller.

The 1785-L20B Controller supports installation of an Electronically Erasable Programmable Read Only Memory (EEPROM) as a memory backup device. Memory options include 1785-ME16 with 16Kwords, 1785-ME32 with 32k Words, 1785-ME64 with 64 Kwords and 1785-ME100 with 100Kwords.

The 1785-L20B has one built-in port dedicated for Data Highway Plus (DH+) communication interface marked as channel 1A. It also has One (1) combo port that can be configured both as DH+ or Remote I/O (adapter or scanner) marked as channel 1B. DH+ communication can be used both for remote programming and monitoring, creating peer-to-peer communication networks between other PLC-5 controllers and communication with visualization systems. Remote I/O connection is used for real time data exchange between the controller and an I/O operator interface and other devices. Additionally, the 1785-L20B controller has a 25-pin connector labeled as channel 0 which is an optically isolated EIA RS232C port. This port supports ASCII and DF1 full-duplex, half-duplex master and half-duplex slave protocols. The controller’s other communication port includes an 8-pin mini DIN connector marked as channel 1A. which functions as DH+ programming terminal with parallel connection to channel 1A.

Channel 1B on 1785-L20B can be configured as remote I/O scanner or remote I/O adapter communication. The remote I/O scanner mode is used to read and write I/O information between a controller and remote I/O device. When in this mode, 1785-L20B is a supervisory controller for other controllers that are in adapter mode and remote I/O adapter modules. When channel 1B is configured as remote I/O adapter mode, the controller monitors and controls its controller-resident local I/O while communicating with the supervisory controller via a remote link. On the 1785-L20B, the Data Highway Plus (DH+) link can be used on channel 1A (this channel is dedicated to this type of communication), and on channel 1B. The maximum cable length for DH+ link depends on the used transmission rate. It is crucial that all devices on a DH+ link are configured to communicate at the same transmission rate. That length goes from a maximum of 3048 m for a speed of 57.6 kilobits per second to 762 m for a speed of 230.4 kilobits per second.

The 1785-L20B has several indicators on the front panel used for easy interaction with the user. Indicators are used for displaying various statuses of the controller. Indicator marked BATT is used for displaying the status of the battery (red when the battery is low). Indicator marked PROC indicates controller current mode, it is green when the controller is in RUN mode, and red when some fault exists. The FORCE indicator is colored amber when I/O forces are enabled. COMM indicator is linked with channel 0 communication status. The indicator is green when the channel is communicating. Channel 1A and 1B both have a dedicated status indicator.

A Three-position key-switch is provided for selecting the controller mode. Each position corresponds to one mode of the processor. RUN mode is used for running controller programs, outputs are enabled. In RUN mode, I/O can be forced and data table values can be edited. Programs can be saved. In program mode (PROG position of key switch) outputs are disabled, and ladder files, SFC files or data files can be created, modified and deleted. It is possible to download and upload transfers with a memory module. Programs can be saved and restored. The third mode of the 1785-L20B processor work is remote mode, which is selected by moving the key switch to REM position. In this mode, it is possible to choose between three sub-modes: remote program, remote test, and remote run. When the processor is in remote run sub-mode, outputs are enabled and programs can be saved, restored, and edited while operating. Remote program sub-mode is the same as normal program mode. While in remote test sub-mode, ladder programs can be executed with outputs disabled, ladder programs or data files cannot be created or deleted. Programs can be saved, restored and edited while operating.

The 1785-L20B has 16000 words of user memory space. The controller’s RAM has a battery backup. For program backups, an EEPROM module can be installed in the slot situated on the front panel. Memory modules with various capacities are available. The total number of I/O (including local I/O and universal remote I/O combined) is 512 with any mix. The 512 inputs and 512 outputs are complementary, meaning that in order to use this much I/O, pairs of modules must have duplicate addresses. The maximum number of analog I/O is 512. 1785-L20B can utilize a total of 13 I/O chassis, and among them, 12 can be universal remote I/O chassis. The backplane current load of the 1785-L20B is 2.3 Amps at 5 Volts. 1785-L20B is not capable of connecting to an extended local I/O chassis.






Manufacturer information

Allen‑Bradley components, integrated control and information solutions are built for demanding industrial applications. We integrate control and information across the enterprise to make you as productive as possible.

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