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| Manufacturer | Rockwell Automation |
| Brand | AB |
| Part Number/Catalog No. | 1771-DB |
| Module Type | Communication Module |
| Description | PLC BASIC Module |
| Communication Port Protocol | RS-232-C, RS-422-A, RS-485, and DH-485 |
| Operation | BASIC Programs and C Programs |
| Communication w/ PLC Processor | Block-Transfer w/ PLC-5 Processor |
| Wiring Arm | 1771-WN |
| Module Scan Time | 1.3-5 ms |
| Storage Temperature | -40-185 F (-40-85 C) |
| Weight | 1.9 lbs (0.9 kg) |
| Coating | Conformal Coat |
| Dimensions | 3.5 x 6.5 x 2.0 in (89 x 165 x 51 mm) |
| UPC | 10612598001641 |
The AB 1771-DB is a PLC 5 Basic Module. It provides an easy interface between a PLC-5 processor, 1771 backplane, and RS-232, RS-422, or RS-485 devices. It can also communicate with a remote SLC processor or remote device across a DH-485 network via a DH-485 port. It provides fast communication independent of the processors. The 1771-DB allows for data analysis and manipulation gathered from the processors and unattended report generation. It saves processor memory by solving complex math or application-specific problems. The 1771-DB has applications in various remote communication devices such as computers, printers, modems, and other third-party devices.
The 1771-DB module has an isolation voltage of 500V DC from port-to-port and port-to-backplane. It has a 32 KB battery-backed RAM and 24 KB available user memory. It has a communication rate ranging from 300 – 19.2 Kbps. It has a backplane current load of 0.75A with a DH-485 interface connected to a DH-485 port and one of 0.65A without a device connected to the DH-485 port. The 1771-DB has a time-of-day clock with a 10ms resolution and a maximum power dissipation of 4W. For installation, it takes one slot in the I/O chassis and supports BASIC and C programming languages. It requires 2 ports for RS-232, RS-422, or RS-485 connections and 1 port for DH-485 connections.
The 1771-DB module supports BASIC statements and commands and its additional 128 calls. It has a Block-transfer capability which allows complete data transfer between the processor’s data table and the module’s memory, thus minimizing user programming. The 1771-DB has 8 defined and 2 user-defined indicators for troubleshooting and indicators.
