1769-ECL Allen-Bradley Compact I/O Datasheet & Technical Manual

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Allen-Bradley 1769-ECL Compact I/O Left Bus Terminator Configured for impedance matching within Compact I/O platforms, the Allen-Bradley 1769-ECL (1769-ECL Left...

SKU: 1769-ECL

Manufacturer: Allen Bradley
Product No.: 1769-ECL
Product Type: Bus Terminators
Product Origin: USA
Payment:T/T, Western Union
Weight: 60g
Shipping port: Xiamen
Warranty: 12 months

Description Reviews

Allen-Bradley 1769-ECL Compact I/O Left Bus Terminator

Configured for impedance matching within Compact I/O platforms, the Allen-Bradley 1769-ECL (1769-ECL Left End Cap / Bus Terminator) provides direct physical/electrical execution. This passive component mounts onto the leftmost edge of a 1769 backplane assembly to close the 5 VDC communication bus loop and suppress signal voltage reflections.

Hardware Specifications

Parameter	Specification
Model	1769-ECL
Brand	Allen-Bradley
Origin	USA
Weight	0.06 kg (0.13 lbs)
Dimensions	118 x 87 x 15 mm (4.65 x 3.43 x 0.59 in)
Operating Temp	0 to +60 deg C
Power Consumption	Passive component (0 mA backplane current draw)
Component Type	Left End Cap / Bus Terminator
Backplane Bus Voltage	5 VDC nominal
Internal Circuitry	Passive termination resistors
Vibration Resistance	5 g at 10 to 500 Hz
Operating Shock	30 g

Backplane Bus Communication & I/O Density Scaling

The device functions as the physical and electrical boundary line for the native backplane bus communication velocity. It contains a network of passive matching resistors that maintain transmission line impedance across the full span of the I/O bank. This structural termination is required to allow stable data packet transfers between the primary controller and remote modules, ensuring that high I/O density scaling does not distort logic waveforms or generate deterministic network fault frames.

Frequently Asked Questions

Q: Can a CompactLogix 1769 I/O bank operate reliably if the 1769-ECL is omitted?

A: No. Omitting the terminator leaves the internal 5 VDC signal paths open-ended, causing high-frequency voltage reflections. This electrical degradation results in erratic I/O behavior, uncorrected data corruption, or immediate "Bus Fault" status trips on the main processor.

Q: Does this left bus terminator require a separate firmware flash compatibility check?

A: No. The 1769-ECL contains no active semiconductors, integrated microprocessors, or logic registers. It operates purely as a passive electronic network, making it completely independent of any controller firmware revisions or system software versions.

Field Installation Guidelines

Slide the terminator directly onto the left side of the last expansion module or power supply interface until the physical alignment tracks mate completely.
Push the integrated mechanical bus lever fully forward into the locked position to engage the internal backplane connector pins.
Do not apply external field wiring, loop power, or ground conductors directly to this unit, as it functions strictly as an internal bus cap.
Check that a matching 1769-ECR right end cap is installed on the opposite end of the local rack to complete the dual-ended termination baseline.

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