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Brand: Allen-Bradley
Allen-Bradley 1769-ECR CompactLogix Right End Cap
Description
The terminator at the right end of a Compact I/O bank
The Allen-Bradley 1769-ECR is the right end cap of the 1769 Compact I/O system. It terminates the CompactBus at the last module on the right-hand side of a bank, so that the bus is correctly closed. The CompactLogix 5370 manual states that a right end cap must be installed on the right side of the control system.
The end cap is a small accessory, but without it the bank will not run, which makes it a typical item to keep as a spare. The left-hand counterpart is the 1769-ECL, which is used at the left end of an expansion bank.
Technical specifications
| Parameter | Specification |
|---|---|
| Manufacturer / family | Allen-Bradley (Rockwell Automation) / 1769 Compact I/O accessories |
| Catalog number | 1769-ECR (1769-ECRK is the conformal-coated version) |
| Function | Right-end cap that terminates the CompactBus |
| Location | Right end of the bank |
| Current draw at 5.1V DC | 5 mA as listed for the end caps |
| Current draw at 24V DC | 0 mA |
| Weight, approx. | 130 g (0.286 lb) as listed for the end caps |
| IEC temperature code | T4 |
| Enclosure type rating | None (open-style) |
| Paired left end cap | 1769-ECL (for the left end of a bank) |
| Certification | c-UL-us Class I Division 2 Groups A, B, C, D (UL File E334470) as printed |
Where it is required
The final I/O bank in a Compact system needs an end cap on the end that does not have an expansion cable. Some packaged CompactLogix controllers ship with a right end cap, for example the 1769-L23x family, so a separate one is not needed there. Where multiple banks are joined by expansion cables (1769-CRL, 1769-CRR and 1769-CLL), only the last open end receives a cap.
The technical data lists a 5 mA draw at 5.1V DC and no draw at 24V DC, and a weight of about 130 g. The IEC temperature code is T4 and the enclosure rating is open-style, so the bank must be mounted in a suitable enclosure.
Installation note
Slide the end cap onto the last module on the right and lock it as shown in the manual. If local expansion modules are not used, the end cap is placed against the controller or the last I/O module, whichever is rightmost. Always remove power before changing the bank and follow the instructions for the controller or adapter.
The accessory table in the Compact I/O technical data lists the end caps next to expansion cables, replacement terminal blocks, door labels and replacement doors. When rebuilding a bank, check that the full set is available, including the terminal blocks of the modules and the end cap.
Related Allen-Bradley products: Allen-Bradley 1769-PB4 CompactLogix DC Power Supply 4 A, Allen-Bradley 1769-PA4 CompactLogix AC Power Supply 4 A, Allen-Bradley 1769-L30ER CompactLogix 5370 L3 Controller 1 MB, Allen-Bradley 1769-L16ER-BB1B CompactLogix 5370 L1 Controller, Allen-Bradley 1769-L33ER CompactLogix 5370 L3 Controller 2 MB and Allen-Bradley 5069-L320ER CompactLogix 5380 Controller.
Documents and quotation
The Compact I/O technical data 1769-TD006 lists the end caps in the accessories section. Send the 1769-ECR reference, quantity and the controller or adapter of the bank for a quotation. Related hardware is in PLC & I/O Cards.
Datasheets & Documents
- Datasheet 1769 Compact I/O Technical Data - November 2023 (1769-TD006H-EN-P) Download
Reviews (0)
About brand
Allen-Bradley is the brand of Rockwell Automation for industrial control: ControlLogix and CompactLogix controllers, I/O systems, PanelView operator terminals, PowerFlex drives, motor control and industrial network equipment. The company began in Milwaukee in 1903, when Lynde Bradley and Dr. Stanton Allen formed the Compression Rheostat Company to make the motor speed controller Bradley had invented in 1901. It took the name Allen-Bradley in 1909 and was bought by Rockwell International in 1985. Since 2001 its owner has been Rockwell Automation, which is still headquartered in Milwaukee, Wisconsin.
Allen-Bradley company profile
| Founded | 1903, Milwaukee, Wisconsin, USA, as the Compression Rheostat Company |
|---|---|
| Founders | Lynde Bradley (inventor of the compression rheostat, 1901) and Dr. Stanton Allen (investor); Harry Bradley joined in 1904 |
| Name | Allen-Bradley Company from 1909 |
| Ownership | Acquired by Rockwell International in 1985 for about USD 1.65 billion; a brand of Rockwell Automation (NYSE: ROK) since 2001 |
| Headquarters | Milwaukee, Wisconsin, USA |
| Product families | Logix programmable automation controllers (ControlLogix, CompactLogix), legacy SLC 500 and MicroLogix PLCs, Micro800 controllers, POINT, FLEX and Compact I/O, PanelView HMIs, PowerFlex AC drives, contactors, motor starters and soft starters, safety components, Stratix Ethernet switches |
Milestones
- 1901: Lynde Bradley invents the compression rheostat to control the speed of electric motors.
- 1903: The Compression Rheostat Company is formed in Milwaukee with an initial investment of USD 1,000.
- 1904: Harry Bradley joins; a crane controller is shown at the St. Louis World's Fair.
- 1909: The company is renamed Allen-Bradley.
- 1985: Rockwell International acquires Allen-Bradley.
- 2001: Rockwell Automation becomes the company's name; the Allen-Bradley brand marks 100 years in 2003.
Reading Allen-Bradley catalogue numbers
The first digits of an Allen-Bradley catalogue number identify the platform, which tells you what is compatible with what. 1756 is ControlLogix (chassis-based, used for large process and plant control), 1769 is CompactLogix 5370 with Compact I/O, 5069 is CompactLogix 5380 with Compact 5000 I/O, 1734 is POINT I/O, 1794 and 5094 are FLEX and FLEX 5000 distributed I/O, 1746 and 1747 belong to the older SLC 500 family, 1766 is MicroLogix 1400 and 2080 is Micro800. For drives, 25B is PowerFlex 525 and 22B is PowerFlex 40; in a code such as 25B-D010N114, "D" means 380–480 V, "010" is the output current rating, and N114 instead of N104 means the drive has an integrated EMC filter. Many plants in the region still run SLC 500 and older MicroLogix systems, which Rockwell has discontinued, so exact spares and migration to CompactLogix are both common requests.
Where Allen-Bradley products are used
In Oman and the GCC, Allen-Bradley controllers and drives run on oil and gas facilities, water treatment and pumping stations, cement, food and beverage and packaging plants, and on machines supplied by American OEMs. ControlLogix is often the platform for plant control systems, while PowerFlex drives are used on pumps, fans and conveyors.
Allen-Bradley products we list
| Family | Examples |
|---|---|
| ControlLogix | 1756-L85E, 1756-EN2T, 1756-EN2TR, 1756-IF16, 1756-IB32, 1756-PA75, 1756-A10 |
| CompactLogix and Micro controllers | 5069-L320ER, 5069-L340ERM, 1769-L33ER, 1769-L16ER, MicroLogix 1400, Micro820, SLC 500 (1746) |
| Distributed I/O | 1734-AENTR, 1734-IB8, 1734-IE2C, 1734-IB8S safety, 1794-AENTR, 5094-AENTR, 5069-IF8 |
| Operator terminals | PanelView Plus 7 10-inch, PanelView Plus 7 15-inch, PanelView 800, PanelView 5310 |
| Drives, motor control and networking | PowerFlex 525, PowerFlex 755, PowerFlex 4, 150-A180NBD SMC, Stratix 2000, 1783-NATR |
Ordering Allen-Bradley products: what we need
Send the full catalogue number and the series letter from the label (for example 1756-EN2T Series D), because firmware and compatibility can change between series. For drives, add the motor power, voltage and filter option. For a discontinued SLC 500 or MicroLogix part, tell us whether you need the exact spare or a migration proposal.
Facts checked against Rockwell Automation's published company history, October 2026.
Browse Allen-Bradley products by category: PLC & I/O Cards, AC Drives.
FAQ
Questions about the Allen-Bradley 1769-ECR CompactLogix Right End Cap
Answers from our engineering team on installation, compatibility and integration.
01What does 1769-ECR do?
It terminates the CompactBus at the right end of a Compact I/O bank.
02Is it required?
The CompactLogix 5370 manual states that a right end cap must be installed on the right side of the control system.
03What is the left end cap?
The 1769-ECL is the left-end cap for expansion banks.
04Does it draw current?
The technical data lists a 5 mA draw at 5.1V DC and no draw at 24V DC.
05Do all controllers need a separate one?
No. Some, such as the 1769-L23x family, are supplied with a right end cap.
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