Allen Bradley 1785-BEM LC 5 Backup Communications Expansion Module, 0.6 Amperes at 5 Volts DC
Brand Name:Allen Bradley
Model Number:1785-BEM
Minimum Order Quantity:1
Delivery Time:2-3 work days
Payment Terms:T/T, Western Union
Place of Origin:USA
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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 Allen-Bradley 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
E-mail: wisdomlongkeji@163.com
Cellphone: +0086-13534205279
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Switchover
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
Allen Bradley 1785-BEM LC 5 Backup Communications Expansion Module, 0.6 Amperes at 5 Volts DC
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