Product Overview: 1785-L46C15 ControlNet PLC-5 Processor
The 1785-L46C15 is a high-performance ControlNet PLC-5 processor from Allen-Bradley. It delivers 48 Kilowords of user memory with protected memory capability. This module supports up to 2048 forcible I/O and 48000 non-forcible analog I/O, ideal for complex industrial control. It features a built-in ControlNet port for high-speed, deterministic communication.
Technical Specifications
| Manufacturer | Rockwell Automation |
| Brand | Allen-Bradley |
| Part Number | 1785-L46C15 |
| Module Type | ControlNet PLC-5 Processor with Protected Memory |
| Processor | PLC-5/46C |
| User Memory | 48 Kilowords (Battery-Backed SRAM) |
| Max Forcible I/O | 2048 (any mix) or 2048 in + 2048 out |
| Max Non-Forcible I/O | 48000 |
| Analog I/O Capacity | Forcible: 2048, Non-Forcible: 48000 |
| ControlNet Port Speed | 5 Mbit/s, up to 99 nodes |
| Backplane Current (5V DC) | 3.3 Amperes |
| Thermal Dissipation | 59 BTU/hour (max) |
| Operating Temperature | 0 to 60 °C (32 to 140 °F) |
| Storage Temperature | -40 to 85 °C (-40 to 185 °F) |
| Relative Humidity | 5-95% non-condensing |
| Vibration | 1G at 10-500Hz |
| Shock | 30G operational |
| Weight | 1.42 kg (3 lbs) |
Key Features & Compatibility
- Protected Memory – prevents unauthorized changes.
- ControlNet Port – redundant, high-speed (5 Mbit/s) networking.
- Supports 1771, 1794, 1746, and 1791 I/O modules.
- Remote I/O & DH+ ports: 57.6K–230.4K bit/s.
- I/O scan time: 0.5 ms (ControlNet) / 3–10 ms (Remote I/O).
- Accepts 1785-ME16, -ME32, -ME64, -M100 EEPROM for backup.
- Backplane current: 3.3 A at 5 V DC.
- Keying: pins 40/42 and 54/56 for chassis.
- Addressing: ½-slot, single-slot, double-slot.
- Enclosure: open-style, rated for industrial environments.
Installation & Serviceability
- Install in a 1771 I/O chassis – supports up to 60 remote chassis.
- Front panel ports: one RS-232-C/422-A/423-A, one coprocessor port.
- Diagnostic LEDs provide quick status checks.
- Battery-backed SRAM retains programs without external power.
- Use 1785-CHBM hot backup cartridge for redundancy.
- Compact design (1.42 kg) fits standard racks.
- No special tools required for routine maintenance.
Typical Applications
- Process control in oil & gas, water treatment, and manufacturing.
- High-speed automation with ControlNet deterministic I/O.
- Legacy system upgrades requiring PLC-5 compatibility.
- Remote I/O racks for distributed control.
- Hot backup systems for critical processes.
Diagnostics & Troubleshooting
- Built-in diagnostic counters for network and I/O errors.
- Status LEDs: RUN, FAULT, FORCE, and COMM.
- Remote I/O and DH+ port diagnostics via programming software.
- Supports RSLogix 5 for comprehensive diagnostics.
- Read/write access to data-table files for troubleshooting.
Certifications & Standards
- UL Listed, CE Marked, CSA Certified, and C-TICK approved.
- Meets industrial EMC and safety standards.
- RoHS compliant (lead-free).
- Designed for Class I, Division 2 hazardous locations.
Why Buy From Oiltech Controls?
- 15+ years in industrial automation spare parts.
- Global shipment via FedEx, UPS, DHL.
- Tested surplus and refurbished options with full functionality.
- 12-month warranty on all products.
- Technical verification before shipment.
- Expert support for obsolete control systems.
Frequently Asked Questions
- Q: Is the 1785-L46C15 compatible with 1771 racks?
A: Yes, it supports up to 60 universal remote I/O chassis. - Q: Does it come with a battery?
A: Yes, the battery-backed SRAM is included. - Q: Can I use it with ControlNet redundant media?
A: Yes, the ControlNet port supports redundant cabling. - Q: What software is required?
A: RSLogix 5 (version 3.0 or higher) is recommended. - Q: Is the memory protected?
A: Yes, protected memory prevents accidental overwrites.
Shipping & Packaging
- Shipped in anti-static packaging with ESD protection.
- Includes quick start guide and terminal block labels.
- Tracking number provided for all shipments.
- Express shipping options: FedEx, UPS, DHL.
- Package dimensions: 30 x 25 x 15 cm, weight ~1.5 kg.
Contact Information
Email: info@oiltechcontrols.com
WhatsApp: +86 158 8020 0923
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