Allen-Bradley 1785-BCM/B Backup Communication Module
$123.00
$320.00
Description
Allen-Bradley 1785-BCM/B Backup Communication Module
The Allen-Bradley 1785-BCM/B, also cataloged as the 1785-BCM/B Backup Communication Module, operates as a dedicated hardware component for redundant PLC-5 processor coordination within 1771 I/O chassis platforms.
Hardware Specifications
| Parameter | Specification |
|---|---|
| Model | 1785-BCM/B |
| Brand | Allen-Bradley |
| Origin | United States |
| Weight | 0.6 kg |
| Operating Temp | 0 to 60 deg C |
| Power Consumption | 5 VDC backplane current: 1.0 A |
| Product Type | Backup Communication Modules |
| Compatible Processors | PLC-5/15 Series B, PLC-5/20, PLC-5/25, PLC-5/30, PLC-5/40, PLC-5/60 |
| Installation Location | 1771 I/O chassis local slot |
| Communication Interface | High-Speed Serial Link (HSSL) |
| Communication Speed | 1.2 Megabaud |
| Customer Relay Output | 0.25 A at 24 VDC resistive load |
| Keying Locations | Between 8-10 and 34-36 |
| Wiring Arm Compatibility | 1771-WG |
| Storage Temperature | -40 to 85 deg C |
| Relative Humidity | 5-95% non-condensing |
| Certifications | UL Listed, CSA Class 1 Division 2 |
| Diagnostics | Status indicators and system status word bits |
EtherNet/IP and PLC Communication Interface Characteristics
The 1785-BCM/B provides PLC-5 redundancy coordination through a dedicated backup communication path between primary and secondary processors. The module exchanges processor status information and manages control transfer conditions through the High-Speed Serial Link interface.
The module supports bumpless switchover operation by maintaining communication synchronization between paired PLC-5 processors. Within PLC-5 control architectures, the module manages redundancy state monitoring, processor health detection, and backup communication functions without adding I/O capacity or processor execution resources.
The 1785-BCM/B integrates with Allen-Bradley PLC-5 systems through the 1771 chassis backplane interface. Firmware and configuration compatibility must match the installed PLC-5 processor family and redundancy architecture.
Firmware and PLC-5 Redundancy Interface Characteristics
The module operates within legacy PLC-5 redundant control systems and uses dedicated backplane communication for module coordination. The HSSL communication link provides data exchange between paired controllers at 1.2 Megabaud.
System status word diagnostics and front-panel indicators provide hardware-level monitoring of communication state and fault conditions. Proper chassis keying and wiring arm installation are required to maintain correct module positioning and field connection.
Frequently Asked Questions
Q: What PLC-5 processors are compatible with the 1785-BCM/B?
A: The module supports PLC-5/15 Series B, PLC-5/20, PLC-5/25, PLC-5/30, PLC-5/40, and PLC-5/60 processors.
Q: What is the backplane power requirement of the 1785-BCM/B?
A: The module requires 1.0 A at 5 VDC from the 1771 chassis backplane.
Q: Does the 1785-BCM/B provide additional I/O or processing capability?
A: No. The module provides backup communication and redundancy coordination functions only.
Field Installation Guidelines
Install the 1785-BCM/B in a compatible 1771 I/O chassis slot using the specified keying positions and 1771-WG wiring arm. Confirm that the chassis power supply can support the module backplane current requirement before installation.
Connect redundancy communication wiring according to the PLC-5 backup system configuration. Keep communication wiring separated from high-voltage power conductors and sources of electromagnetic interference.
Verify module status indicators after power-up and confirm correct processor synchronization through PLC-5 diagnostic status information. Maintain environmental conditions within the specified temperature and humidity limits during operation.
Features
Minimum Order Quantity (MOQ)
We welcome bulk orders and have a minimum order quantity of just one unit.
Certificates and Documentation
Upon request, we can provide all necessary documentation, including Certificates of Origin/Conformance and other required export documents.
Delivery Time
For items in stock, we aim to deliver within 1-3 days after payment confirmation. Items with specified lead times will be delivered according to the quoted schedule.
Payment Methods
We accept 100% T/T (Telegraphic Transfer) payment before shipping. For items with lead times, a 30% deposit is required upfront, with the remaining 70% due before shipment. For RMB transfers, please contact us if you have an agent in China.
Warranty
We offer a standard one-year warranty on all new and original items. If you require an extended warranty, please contact us for additional cost details.
Refund and Return Policy
Your satisfaction is important to us. If you need to return an item, it must be done within 30 days of the order date. The product must be unused, unopened, and in its original packaging with all accessories included. Refunds are processed within 5-7 business days after we receive the returned item. Please note that shipping and related charges are non-refundable.
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