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Allen-Bradley 1785-BCM PLC-5 Backup Communication Module – Technical Specifications and FAQ
Technical Specifications
| Parameter | Specification |
|---|---|
| Brand | Allen-Bradley |
| Manufacturer | Rockwell Automation |
| Model | 1785-BCM |
| Product Series | PLC-5 |
| Product Type | Backup Communication Module |
| Main Function | Provides backup communication and network switching between primary and secondary PLC-5 processors |
| Compatible Processors | PLC-5/15 Series B, PLC-5/20, PLC-5/25, PLC-5/30, PLC-5/40 and PLC-5/60 (Series B specification) |
| Installation | 1771 Local I/O Chassis |
| Mounting | Single-slot chassis installation |
| Communication Interfaces | 1 × High-Speed Serial Link (HSSL), 2 × DH+/Remote I/O |
| HSSL Communication Rate | 1.2 Mbaud (Series B) |
| HSSL Connection Distance | Up to 15 ft (approximately 4.57 m) |
| Data Buffer | 4K words |
| Backplane Current | 1.0 A at 5V DC |
| Customer Relay Rating | 0.25 A at 24V DC (resistive) |
| Wiring Arm | 1771-WG |
| Keying Locations | Between 8–10 and 34–36 |
| Operating Temperature | 0–60°C |
| Storage Temperature | -40–85°C |
| Relative Humidity | 5–95%, non-condensing |
| External Power Supply | Not required; powered through chassis backplane |
| Dimensions (H × W × D) | Approx. 150 × 35 × 260 mm (estimated module envelope; verify against actual revision) |
| Weight | Approx. 0.6 kg |
| Country of Origin | USA (distributor-listed; verify product nameplate) |
| Lifecycle Status | Discontinued / Legacy product |
FAQ
FAQ
Q1: What is the Allen-Bradley 1785-BCM?
A: It is a PLC-5 Backup Communication Module designed to provide communication backup and network switching between primary and secondary PLC-5 processors.
Q2: Which PLC-5 processors are compatible with the 1785-BCM?
A: The Series B specification lists compatibility with PLC-5/15 Series B, PLC-5/20, PLC-5/25, PLC-5/30, PLC-5/40 and PLC-5/60 processors. Compatibility depends on the module revision.
Q3: What communication interfaces does it provide?
A: It provides one High-Speed Serial Link (HSSL) interface and two DH+/Remote I/O communication interfaces.
Q4: What is the HSSL communication speed?
A: The Series B module communicates through HSSL at 1.2 Mbaud. It is used to exchange backup information between the primary and secondary PLC-5 systems.
Q5: Does the 1785-BCM require an external power supply?
A: No. It receives operating power through the 1771 I/O chassis backplane, requiring 1.0 A at 5V DC.
Q6: Which wiring arm is required?
A: It uses the Allen-Bradley 1771-WG wiring arm for field wiring connections.
Q7: What are the dimensions and weight?
A: The estimated module envelope is approximately 150 × 35 × 260 mm, and the approximate weight is 0.6 kg. Actual dimensions and weight may vary by revision and packaging.
Q8: Is the 1785-BCM discontinued?
A: Yes. The 1785-BCM belongs to the legacy PLC-5 product family and is discontinued by the manufacturer. It is generally available through surplus, refurbished, and industrial spare-parts suppliers.
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Packing & Delivery
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Please rest assured that we have a deep cooperation with express delivery companies and can ensure that your goods are delivered to you in good condition.
