FAQ
Q: What is the purpose of the 1785-BCM/C?
A: It provides redundant communication capability for PLC-5 controllers and switches communication to a backup processor when the primary path fails.
Q: What communication networks are supported?
A: The module supports DH+, RIO, and high-speed serial communication via HSSL.
Q: Does it need external power?
A: No, it is powered directly from the 1771 I/O chassis backplane.
Q: Is it compatible with all PLC-5 models?
A: It supports a broad range of PLC-5 processor series including PLC-5/15 through PLC-5/60.
Q: Is it ideal for new system designs?
A: It is mainly intended for existing PLC-5 installations requiring redundancy support.
Products Description
The Allen-Bradley 1785-BCM/C is a backup communication module for the PLC-5 automation family. It enhances system redundancy by maintaining communication pathways when a primary PLC processor loses communication or encounters a fault. The module integrates within a 1771 I/O chassis and supports Data Highway Plus (DH+) and Remote I/O (RIO) communication networks, allowing continuous operation in industrial control environments.
Key Features & Advantages
1. Provides redundant communication paths for PLC-5 systems using DH+ and RIO.
2. Supports fast switchover through a high-speed serial link (HSSL).
3. Includes internal buffering to maintain data context during transfer events.
4. Compatible with multiple PLC-5 processor series.
Product Description
1. The 1785-BCM/C is engineered for industrial applications where continuous communication between PLC processors and remote devices is essential. When used within redundant PLC-5 setups, the module monitors communication health and ensures that the backup processor can take control without major interruption.
2. Its design supports both new and legacy PLC-5 installations, making it suitable for plants that rely on long-term system stability. The high-speed serial link helps synchronize data between processors, while the durable hardware construction ensures dependable operation under varied industrial conditions.
3. The module requires no external power supply and fits directly into the 1771 chassis, enabling straightforward replacement or system expansion while maintaining compatibility with DH+ and RIO networks.
Technical Parameters
|
Parameter |
Value |
|
Manufacturer |
Allen‑Bradley / Rockwell Automation |
|
Part Number |
1785‑BCM/C |
|
Module Type |
Backup Communication Module |
|
Processor Compatibility |
PLC‑5/15, ‑5/20, ‑5/25, ‑5/30, ‑5/40, ‑5/60 |
|
Communication Interfaces |
DH+, RIO, HSSL |
|
HSSL Speed |
Up to 1.2 Megabaud |
|
Internal Buffer |
Up to 4K Words |
|
Module Slot |
1771 I/O Chassis |
|
Operating Temperature |
0–60°C |
|
Storage Temperature |
-40–85°C |
|
Relay Output |
0.25 A @ 24 V DC |
|
Certifications |
UL, CSA Class 1 Div 2 |
Why Choose This Module
1. Designed to maintain operation during processor communication failures.
2. Compact single-slot installation.
3. Industrial-grade construction suitable for long-term use.
4. Supports reliable operation of established PLC-5 networks.
Contact Information
Email: sales3@mooreplc.com
WhatsApp: +86 180 2071 4662
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