Industrial Automation Solution – Allen-Bradley 1785-L40C15/F | PLC-5 Series
Where This Product Is Used
The Allen-Bradley 1785-L40C15/F is a PLC-5/40C15 processor module engineered for demanding industrial control environments. It is widely deployed in:
- Automotive Manufacturing – Body-in-white assembly lines, paint shop conveyors, and robotic welding cells requiring deterministic scan-cycle control.
- Oil & Gas Processing – Wellhead control panels, pipeline SCADA integration, and compressor station automation where ControlNet connectivity is mandatory.
- Water & Wastewater Treatment – Pump station sequencing, chemical dosing control, and SCADA-linked remote I/O management.
- Pulp & Paper Mills – Coordinated drive control, winder/unwinder sequencing, and DCS integration via ControlNet.
- Mining & Minerals Processing – Crusher control, conveyor interlocking, and plant-wide network architectures using legacy PLC-5 infrastructure.
- Power Generation & Utilities – Turbine auxiliary control, switchgear automation, and substation RTU replacement projects.
Technical Specifications
- Part Number: 1785-L40C15/F
- Series / Revision: F
- Product Family: PLC-5/40C15
- Manufacturer: Allen-Bradley (Rockwell Automation)
- Processor Memory: 40K words user memory
- I/O Capacity: Up to 3,072 discrete I/O points
- Communication Ports: ControlNet (coax), DH+, RS-232 (DF1/DH-485)
- Network Protocol: ControlNet (scheduled & unscheduled messaging)
- Backplane Compatibility: 1771 I/O chassis
- Power Supply: 1771-P4S or equivalent 1771-series PSU
- Operating Temperature: 0 °C to 60 °C
- Weight: 1,420 g (approx.)
- Firmware: Series F (latest revision for PLC-5/40C15 platform)
Why Engineers Specify This Model
- ControlNet Native Integration – Onboard ControlNet port eliminates the need for a separate 1784-KTCX15 scanner card, reducing rack space and cost.
- 40K-Word Memory Headroom – Sufficient for complex ladder logic programs with PID loops, sequencers, and extensive data table management without memory expansion.
- Proven PLC-5 Ecosystem – Thousands of installed base machines worldwide run on PLC-5 architecture; the /F revision ensures maximum backward compatibility with existing RSLogix 5 programs.
- Dual-Port DH+ & RS-232 – Enables simultaneous HMI communication and programming terminal access without network conflicts.
- Drop-In Replacement – Direct hardware replacement for 1785-L40C15/A through /E revisions with no I/O rewiring required.
Complete System Bill of Materials
A typical PLC-5/40C15 control panel build requires the following components:
- 1785-L40C15/F – PLC-5/40C15 Processor (this item)
- 1771-A4B – 16-slot 1771 I/O chassis
- 1771-P4S – 5 A power supply for 1771 chassis
- 1771-OBD – 16-point 24 VDC output module
- 1771-IBD – 16-point 24 VDC input module
- 1784-PKTX – ControlNet PCI interface card (for programming workstation)
- 1786-RPA/B – ControlNet coax repeater (for extended network runs)
- 6189V-XXXX – VersaView industrial PC running RSLogix 5 / RSNetWorx
Compliance & Industry Standards
- UL Listed – UL 508 (Industrial Control Equipment)
- CE Marked – EN 61131-2 (Programmable Controllers)
- RoHS Compliant – Series F revision meets EU RoHS Directive 2011/65/EU
- ATEX / IECEx – Suitable for use in Zone 2 classified areas when installed in approved enclosures
- IEC 61158 – ControlNet fieldbus standard compliance
Quality Assurance & Sourcing
Every 1785-L40C15/F unit shipped from Konmask.com undergoes a documented inspection process:
- Visual inspection for physical damage, corrosion, and counterfeit indicators
- Firmware revision verification against Rockwell Automation release notes
- Functional power-on test with scan-cycle confirmation
- Anti-static packaging with humidity indicator card
- Certificate of conformance available upon request
Units are sourced from decommissioned OEM lines, authorized distributors, and certified refurbishers. All stock is traceable to original manufacturer documentation.
How to Source This Part
- In Stock: Add to cart and check out directly — most orders ship within 1–3 business days.
- Bulk / Project Quantity: Contact us for volume pricing and lead-time commitments on quantities of 5 or more units.
- Urgent Requirement: Call or WhatsApp +0086 19859288691 for same-day quotation and expedited freight options.
- Exchange / Core Return: We accept working or faulty 1785-series cores as part-exchange — contact us before ordering.
Application-Specific FAQ
Q: Is the 1785-L40C15/F compatible with RSLogix 5 version 8.x?
A: Yes. RSLogix 5 v8.00 and later fully supports the PLC-5/40C15 Series F processor, including online editing and ControlNet configuration via RSNetWorx for ControlNet.
Q: Can this processor communicate with CompactLogix or ControlLogix systems?
A: Yes, via ControlNet bridging or EtherNet/IP using a 1788-ENBT gateway. MSG instructions can be configured for cross-platform data exchange.
Q: What is the maximum ControlNet node count supported?
A: The PLC-5/40C15 supports up to 99 ControlNet nodes per network segment.
Q: Is a battery required, and which type?
A: Yes. The 1785-L40C15/F requires a 1770-XYC or equivalent lithium battery to retain user memory during power loss. Battery life is typically 3–5 years.
Q: Can I use this module to replace a 1785-L40B (DH+ only) processor?
A: Yes, with a program re-download. The /40C15 adds ControlNet capability; existing DH+ and RS-232 configurations remain fully compatible.
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