Original Allen Bradley 1794-CE3 1794CE3 Flex Extension Cable 1794-CE3 1794CE3

1794-CE3 | FLEX I/O 1794 Shielded Bus Extension Cable — 3 Feet / IP20 / FlexLogix Compatible / Flexible Construction

FLEX I/O Bus Extension — Physical Flexibility for Distributed I/O

The 1794-CE3 is the 3-foot shielded bus extension cable for the 1794 FLEX I/O system — a flexible, shielded cable that carries the 1794 I/O backplane communication bus between FLEX I/O adapters, terminal bases, and FlexLogix controllers.

The 1794 FLEX I/O platform is a modular, distributed I/O system designed for mounting directly on the machine or process equipment — close to sensors and actuators, rather than in a centralised panel. The 1794-CE3 cable enables the physical separation between FLEX I/O components that this distributed installation concept demands — connecting I/O modules across gaps in the panel, between DIN rail sections, or between the adapter and terminal base groups that make up a FLEX I/O installation.

Key Specifications

Shielded and Flexible — The Right Properties for Industrial Bus Extension

Shielded construction: The 1794 I/O bus carries backplane communication data — digital signals that are susceptible to electromagnetic interference from adjacent power wiring, motor drives, and contactors. The 1794-CE3's shielding prevents interference from corrupting I/O bus data, maintaining reliable communication between the FLEX I/O adapter and all connected I/O modules.

Flexible cable: The flexible construction allows the cable to be routed through the bends, corners, and tight spaces typical of machine-mounted distributed I/O installations — without the conductor fatigue that would affect rigid cable in the same application. The flexible design also accommodates minor positional variations between FLEX I/O components without stressing the cable connections.

3-foot length: The 3-foot (approximately 0.91m) length provides a practical reach between FLEX I/O components in the same panel, on adjacent DIN rail sections, or between the controller and the I/O terminal base group — covering the majority of typical FLEX I/O distributed I/O spacing requirements.

Applications

Machine-mounted distributed I/O: FLEX I/O installed directly on production machines — packaging equipment, assembly machines, conveyor systems, and process equipment — where the I/O adapter and terminal base groups require physical separation.

Panel wiring flexibility: Control panels where the FLEX I/O adapter is in one part of the panel and the terminal base groups are in another — the 1794-CE3 connects them without requiring direct mechanical coupling.

FlexLogix controller integration: Connecting a FlexLogix controller to remote 1794 terminal base groups within the same control system.

Production line distributed I/O: Multi-station production lines using 1794 FLEX I/O at each station — the 1794-CE3 provides the bus extension between station adapter and terminal bases.

FAQ

Q1: What is the maximum number of 1794-CE3 cables or total extension length in a FLEX I/O system?

The 1794 FLEX I/O system documentation specifies maximum backplane cable lengths and the permitted number of bus extension cables in a system. Exceeding the maximum cable length degrades signal integrity on the 1794 bus, potentially causing communication errors and I/O module fault conditions. Refer to the 1794 FLEX I/O installation manual for the specific maximum cable count and total bus length limits.

Q2: Is 1794-CE3 compatible with all 1794 FLEX I/O adapters and terminal bases?

The 1794-CE3 is designed for the 1794 FLEX I/O backplane bus and is compatible with the standard range of 1794 adapters and terminal bases that use the same bus connector format. Confirm from the 1794 FLEX I/O system documentation that the specific adapters and terminal bases in the installation use the standard bus connector — some 1794 variants may use different connector configurations.

Q3: What enclosure IP rating is required when using 1794-CE3?

The 1794-CE3 cable assembly itself is IP20. The enclosure or cabinet housing the 1794 FLEX I/O components and this cable must provide the IP protection required for the installation environment — typically IP54 or IP65 for machine-mounted applications in industrial production environments with exposure to coolant, dust, or water spray. The cable alone is not suitable for direct exposure outside of an enclosure.

Q4: Can 1794-CE3 be routed alongside power wiring in the same cable tray?

Routing the 1794-CE3 bus extension cable alongside high-current power cables or drive output wiring is not recommended — interference from these cables can affect the 1794 backplane communication signals even with the cable's shielding. Route the 1794-CE3 in the signal wiring section of the panel, separated from power wiring by standard panel wiring segregation practice. If routing near power wiring cannot be avoided, maintain maximum possible separation and cross power cables at 90° rather than running parallel.

Q5: What other cable lengths are available for the 1794 FLEX I/O bus extension?

The 1794-CE bus extension range includes cables in different lengths — the 1794-CE3 is the 3-foot (approximately 0.91m) variant. Other standard lengths include the 1794-CE1 (1 foot) and the 1794-CE6 (6 feet). Select the cable length that provides sufficient reach for the physical spacing between FLEX I/O components in the specific panel layout without significant excess cable length.