Allen-Bradley 1785-BEM Backup Communications Expansion Module
$123.00
$320.00
Description
Allen-Bradley 1785-BEM Backup Communications Expansion Module
The Allen-Bradley 1785-BEM, also cataloged as the 1785-BEM Backup Communications Expansion Module, operates as a dedicated hardware component for communication channel switching and backup control execution within PLC-5 processor systems. The module interfaces with 1785-BCM Series B modules through the I/O chassis backplane and provides two configurable communication links for DH+ and Remote I/O networks.
Hardware Specifications
| Parameter | Specification |
|---|---|
| Model | 1785-BEM |
| Brand | Allen-Bradley |
| Origin | USA |
| Module Type | Backup Communications Expansion Module |
| Product Line | PLC-5 |
| Weight | 0.99 lbs |
| Dimensions | 4.5 x 12.4 x 6.3 in |
| Power Consumption | 0.6 A at 5 VDC backplane current |
| Backplane Requirement | 0.6 A at 5 VDC |
| Communication Interfaces | 2 communication links |
| Network Support | Data Highway Plus (DH+) and Remote I/O |
| Maximum Modules Per System | 4 |
| External Power Supply | None required |
| Status Indicators | One diagnosis/status LED per channel |
| Relay Contact Rating | 0.25 A at 24 VDC resistive load |
| Signal Delay | AC Off: 29 +/- 8 ms; DC Off: 30 +/- 7 ms |
PLC-5 Backup Communication Channel Switching
The 1785-BEM module provides additional communication channel switching capability when installed with a 1785-BCM Series B module in PLC-5/40, PLC-5/60, or PLC-5/80 processor configurations. The module communicates through the PLC chassis backplane and supports switching of configurable communication paths.
The module contains two communication ports assigned for Data Highway Plus or Remote I/O link operation. The SW2 switch assembly defines the communication function assignment for Channels 2A and 2B.
The local backplane interface transfers communication status and control information between the 1785-BEM and the associated 1785-BCM module. The customer relay output provides external device switching capability, with inductive loads requiring additional suppression components.
Frequently Asked Questions
Q: What communication networks can the 1785-BEM interface with?
A: The 1785-BEM provides two configurable communication links supporting Data Highway Plus (DH+) and Remote I/O network connections.
Q: What is the backplane current requirement of the 1785-BEM?
A: The module requires 0.6 A from the 5 VDC I/O chassis backplane supply.
Q: Does the 1785-BEM require an external power supply?
A: No external power supply is required. The module receives operating power through the PLC-5 chassis backplane interface.
Field Installation Guidelines
Install the 1785-BEM module in the designated PLC-5 I/O chassis slot and verify proper seating of the module edge connector before operation. Confirm compatibility with the installed 1785-BCM Series B backup configuration.
Configure the SW2 switch assembly according to the required DH+ or Remote I/O communication assignment before applying system power. Connect communication wiring using appropriate shielded industrial cable practices and route communication cables separately from high-voltage power conductors to reduce electrical interference.
For customer relay connections, install suppression devices when switching inductive loads. Verify chassis grounding, cable shield termination, and backplane power availability according to the PLC-5 installation documentation.
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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