Product Description
Allen-Bradley 1785-L20C15/E ControlNet 1.5 Processor
The Allen-Bradley 1785-L20C15/E is a PLC-5 ControlNet 1.5 processor designed for high-speed, deterministic control applications. It supports multiple communication networks, including ControlNet, DH+, serial, and remote I/O, making it suitable for complex industrial automation systems.
Processor Specifications
| Attribute |
Specification |
| Backplane Current |
2.7A @ 5V DC (1785-L20C15) |
| Heat Dissipation |
54 BTU/hour (1785-L20C15) |
| Operating Temperature |
0–60°C (32–140°F) |
| Storage Temperature |
-40–85°C (-40–185°F) |
| Relative Humidity |
5–95% (non-condensing) |
| Vibration Resistance |
2g @ 10–500 Hz (IEC 60068-2-6) |
| Shock Resistance |
30g (operating), 50g (non-operating) |
| Enclosure Type |
None (open-style) |
| Time-of-Day Clock Accuracy |
±5 min/month @ 60°C, ±20 sec/month @ 20°C |
Communication Capabilities
| Network Type |
Details |
| ControlNet |
1 redundant port, 5M bit/s |
| Remote I/O & DH+ |
57.6K, 115.2K, 230.4K bit/s |
| Serial Communication |
1 port |
| Number of MCPs |
16 |
ControlNet Performance
| Attribute |
Specification |
| Max Nodes (No Repeater) |
48 (250 m cable) |
| Max Nodes (With Repeaters) |
99 |
| Max Link Cable Length (No Repeater) |
1000 m (2 nodes), 500 m (32 nodes), 250 m (48 nodes) |
| Max Link Cable Length (With Repeaters) |
6000 m (2 nodes), 3000 m (typical) |
| Max I/O Map Entries |
64 (L20C15) |
| Max DIF/DOF Size |
2000 words (L20C15) |
I/O & Memory
| Attribute |
PLC-5/20C15 |
| Max User Memory |
16K words |
| Max Total I/O |
512 |
| Program Scan Time |
0.5 ms per K word (bit logic) |
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