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Description
Technical Specifications for 1785-BCM
| Manufacturer | Rockwell Automation |
| Module Type | Backup Communications Module |
| Certification | UL – Industrial Control Equipment, E65584 CSA – Class 1, Division 2, LR69960C |
| Operational Temperature | 0 Deg. Celsius to 60 Deg. Celsius (32 Deg. Fahrenheit to 140 Degree Fahrenheit) |
| HSSL | communicates with 1.2 Megabaud |
| Customer Relay | .25A @ 24V dc (resistive) |
| Keying Locations | between 8 and 10 between 34 and 36 |
| Module Location | 1771 I/O Chassis (local) |
| Compatible processors | PLC-5/15 series B, -5/20, -5/25, -5/30, -5/40, and -5/60 |
| Brand | Allen-Bradley |
| Part Number/Catalog No. | 1785-BCM |
| High Speed Serial Link Interface | 1 |
| DH+/RIO Interface | 2 |
| Wiring Arm | 1771-WG |
| 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 |
| Dimensions | 4.5 x 12.4 x 6.3 in (115 x 317 x 160 mm) |
| UPC | 10612598117472 |
About 1785-BCM
The 1785-BCM also features an internal buffer amounting up to 4K Words and capable of initiating switchover in different events such as power failure, processor error including 1785-BCM partner module fault. Additionally, switchover may also happen during manual switchover from RUN to PROGRAM mode, REMOTE RUN to REMOTE PROGRAM transition and REM RUN and REMOTE TEST mode changed.
The 1785-BCM is compatible for use with a variety of PLC5 processors such as PLC-5/15 series B, -5/20, -5/25, -5/30, -5/40, and -5/60 processors. It is installed to a 1771 I/O chassis with keying locations between 8 and 10 or between 34 and 36. It requires use of a Wiring Arm with catalog number 1771-WG for fast termination of communication wires to the 1785-BCM.
When using the BCM, input and output modules are not permitted to be installed in the same chassis where the processor and the BCM is installed. The I/O modules must be installed remotely, acting as distributed I/O stations.
