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Allen Bradley 1785-BEM LC 5 Backup Communications Expansion Module, 0.6 Amperes at 5 Volts DC

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Allen Bradley 1785-BEM LC 5 Backup Communications Expansion Module, 0.6 Amperes at 5 Volts DC

Large Image :  Allen Bradley 1785-BEM LC 5 Backup Communications Expansion Module, 0.6 Amperes at 5 Volts DC

Product Details:

Place of Origin: USA
Brand Name: Allen Bradley
Model Number: 1785-BEM

Payment & Shipping Terms:

Minimum Order Quantity: 1
Price: negotiable
Packaging Details: New in original box
Delivery Time: 2-3 work days
Payment Terms: T/T, Western Union
Supply Ability: 100
Detailed Product Description
Brand: Allen Bradley Model: 1785-BEM
K: 48 Tpye: Redundancy Module
Place Of Origin: USA FW: K.2
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Allen Bradley 1785-BEM LC 5 Backup Communications Expansion Module, 0.6 Amperes at 5 Volts DC


Technical specifications:
Brand/ManufacturerAllen Bradley
Manufacturer Part Number1785-BEM
Product typeCommunication ExpansionModule
Module typeCommunication Expansion
Module Supply voltage5 V dc;24 V dc
Current rating0.6 A @ 5 V dc
For use withProvides High Speed Backup Communication and Switchover of the Data Highway Plus and Remote I;O Links
Mounting typeChassis Mount
Dimensions115 x 317 x 160 mm
Minimum operating temperature0 °C
Maximum operating temperature+60 °C
Weight0.1 kg
Length317 mm
Width160 mm
DH+/RIO Interface 2
Operating System Windows 95/NT
Bus Communcations Local PCI 2.3 Compliant
LEDs 1 Diagnosis/Status Per Channel
Max Modules Per System 4
Weight 0.3 lbs (0.1 kg)
Coating Conformal Coat
Required External Power None
Typical AC Signal Delay (Off) 29 (+/- 8) ms
Typical DC Signal Delay (Off) 30 (+/- 7) ms
Wiring Arm 1771-WN
About 1785-BEM
The 1785-BEM PLC 5 Backup Communication Module is a backup communication module by AB which is installed in a single I/O slot on the 1771 chassis and which allows for high-speed communication transfer between 2 connected PLC processors. The 1785-BEM backs up the processor’s data and information to prevent the loss of data in the instance of failure in the system. The module requires a backplane current of 0.6A at 5V DC, and it is capable of enabling the PLC-5 processors with 32-bit input capability on the processors image table. The 1785-BEM is designed with a switch assembly which consists of 4 switches set in varying positions, and it requires a field wiring arm (26-14 AWG) which has a wiring arm torque of 9 pounds-inches.
The 1785-BEM uses a copper wire with 26–14 AWG size as conductors, and it comes with the 1771-CD cable connector for DH+ and Remote I/O (RIO) communication. It has an HSSL communication speed of about 1.2 Mega Baud and it has a factory-built 0.25A relay at 24V DC (resistive). Keying to the backplane is achieved by a connection between pins 8 and 10 and pins 34 and 36 of the backplane top connector and it is CE, UL, and CSA-certified. The 1785-BEM has a factory-designated operating temperature range between 0 and 60 oC (32 and 140 oF) at a humidity range of 5-95% without condensation, and it has a storage temperature range of -40-85 oC (-40-185 oF).


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Contact person: Anna
Cellphone: +0086-13534205279
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Should a fault occur in the primary processor, control switches to the secondary system in less than 50 ms (maximum). When a switchover occurs, the outputs in the remote I/O maintain their last state until they
come under the control of the secondary processor.
However, keep in mind that the program scans of the two processors are not synchronized. This means that the secondary processor may be scanning all, none, or only part of the program (at your discretion). This manual explains the switchover process, and provides guidelines for developing programs for your PLC-5 backup system. (For more information about switchover, refer to Chapter 6, “Switchover Considerations.”)



Role of the 1785-BCM Series B Module
As an integral part of the backup system, the 1785-BCM modules enable high speed communication between the two PLC-5 processors, and permit the secondary processor to assume control of the process. In addition, the 1785-BCM module provides:
high speed transfer of the data table values from the primary to the secondary system, to ensure that the secondary system’s data table is a copy of the primary system’s a buffer of 4K words for data table values
exchange of information on the status of the primary and secondary systems
automatic transfer to the secondary system of the remote input and block transfer read values (analog values, etc.) transfer of control from the primary processor to the secondary
processor when one of the following conditions occur:
- power failure
- processor fault
- 1785-BCM module fault




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