Expert Technical Evaluation & Performance Review
The 1785-L80C serves as a powerful ControlNet processor from the PLC-5 series. Its primary function involves directing complex field device processes. This module mounts directly onto a standard 1771 I/O chassis. Engineers find its design ideal for high-density control applications. This unit manages a maximum of 3072 total I/O points.
Memory Capacity and Scan Efficiency
The 1785-L80C features a battery-backed static RAM for program retention. Its user memory capacity reaches exactly 100 Kilowords or 100K words. This large memory space handles extensive logic and data tables effectively. The processor executes bit logic at 0.5ms per K word. It processes word-based instructions at 2ms per K word. This performance ensures reliable and deterministic control loop execution.
I/O Capacity and Flexible Addressing
This controller supports up to 3072 I/O points in any mix. It also accommodates a complementary configuration of 3072 inputs plus 3072 outputs. The module addresses hardware using 2-slot, 1-slot, or ½-slot modes. This flexibility allows seamless integration with various 1771 I/O modules. It works with intelligent, 8, 16, and 32-point I/O modules. You can connect up to 93 I/O chassis in total for expansion.
Environmental Tolerances and Certifications
The 1785-L80C operates reliably without de-rating across a wide temperature range. It functions from 0 to 60°C (32 to 140°F) effectively. The controller handles a relative humidity range of 5 to 95% without condensation. It passes IEC testing for operational vibration of 2G at 10-500Hz. The unit also withstands a 30G operational shock for rugged use. It holds CE, UL, CSA, and C-TICK certifications for global compliance.
Communication Network Capabilities
This processor integrates multiple high-speed communication networks for versatile connectivity. It uses a ControlNet NAP port with 5 Mbit/s transfer speed. This port is an RJ-45 type for easy connection. The network update time is user-selectable from 2 to 100ms. The module supports DH+ and remote I/O networks with three speeds. These speeds include 57.6K, 115.2K, and 230.4K bits/s. Standard I/O scan time ranges from 10ms down to 3ms per rack.
System Integration and Redundancy
The 1785-L80C supports critical options for high-availability system designs. It works with the ControlNet hot backup cartridge (1785-CHBM) for redundancy. The controller uses a battery module (1770-XYC) for memory backup. It also accepts battery-backed memory modules like 1785-ME32, -ME64, or -M100. An internal clock/calendar offers ±5 min per month accuracy. The module draws a backplane current of 3.3A at 5V DC. It dissipates a maximum of 59 BTU/hour of heat when operational.
Logistics & Standard Packaging Details
