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Allen-Bradley 1794-L34 FlexLogix Controller Module
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- Part Number: 1794-L34
- Brand: Allen-Bradley
- Type: CPU Processors
- Barcode: USA
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Allen-Bradley FLEX I/O
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CPU Processors
Product Description
The Allen-Bradley 1794-L34, also cataloged as the 1794-L34 FlexLogix Controller, operates as a dedicated hardware component for distributed logic execution and process task management within FLEX I/O control platforms.
Hardware Specifications
| Parameter | Specification |
|---|---|
| Model | 1794-L34 |
| Brand | Allen-Bradley |
| Origin | USA |
| Weight | 2.00 lbs (0.91 kg) |
| Dimensions | Standard FlexLogix controller footprint |
| Operating Temp | 0 to 60 deg C |
| Power Consumption | 20.4 W at 24 VDC (25.5 W at 19.2 VDC) |
| Input Voltage Range | 19.2 to 31.2 VDC (24 VDC nominal) |
| Input Current | 0.85 A at 24 VDC (1.33 A max at 19.2 VDC) |
| User Memory | 512 KB |
| Flexbus Output Current | 653 mA at 5.1 VDC max |
| Thermal Dissipation | 87 BTU/hr at 19.2 VDC |
| Isolation Voltage | 30 VDC (qualification tested to 850 VDC) |
| Serial Interfaces | RS-232 / RS-422 / RS-485 (DF1, ASCII, DH-485) |
| Power Connector Torque | 0.6 to 0.8 Nm (5 to 7 lb-in) |
| Mounting Format | DIN-rail / Panel Mount |
EtherNet/IP Deterministic Networks and Firmware Flash Compatibility
The 1794-L34 processing engine manages up to 8 user tasks (1 continuous task alongside periodic and event-driven tasks) while communicating across EtherNet/IP deterministic networks via 1788-series daughtercards. Supporting up to 32 simultaneous CIP connections over network adapters, the processor preserves backplane communication velocity while driving local I/O expansion via 1794-CE1 or 1794-CE3 bus extender cables. System firmware flash compatibility allows online executive updates to ensure synchronized logic scan timing and seamless integration with Logix-based control routines.
Frequently Asked Questions
Q: What power supply type is required to satisfy CSA regulatory requirements for the 1794-L34 controller?
A: A Separated Extra Low Voltage (SELV) or Safety Extra Low Voltage (PELV) power supply, such as the Allen-Bradley 1794-PS3 or 1794-PS13, must be used to power the 24 VDC input terminals.
Q: How many local FLEX I/O modules can the 1794-L34 supply via its Flexbus output?
A: The internal power distribution circuit outputs up to 653 mA at 5.1 VDC across the Flexbus backplane, which directly limits the total number and type of attached FLEX I/O modules based on their cumulative current draw.
Field Installation Guidelines
- Mount the controller onto a 35 x 7.5 mm steel DIN rail or directly to an enclosure backpanel using mounting screws.
- Terminate 24 VDC primary power wiring using 22 to 14 AWG (0.324 to 2.08 mm sq) stranded copper wire, tightening screw contacts to 0.6 to 0.8 Nm (5 to 7 lb-in).
- Connect serial communication interface lines (DF1 or ASCII) using an industrial 1756-CP3 or 1747-CP3 programming cable assembly.
- Route local expansion backplane cables (1794-CE1 or 1794-CE3) away from heavy inductive loads and high-voltage AC lines.
- Ensure the controller ground terminal connects directly to a low-impedance master earth ground bus bar.
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