The Allen-Bradley 1771-DCM is a PLC 5 Direct Communication Module. It allows communication between a local processor with the remote I/O scanner port of a supervisory processor by using a remote I/O adapter port across a remote I/O link. It supports two modes of transfer i.e., discrete transfer for up to eight words or block transfer for up to 64 words with 1 status word. A supervisory processor communicates with the 1771-DCM as an adapter module and the local processor communicates over the backplane using block transfer. It has uses in various applications where the transfer of data table values is required.
The 1771-DCM module has a communication rate of 57.6 Kbps and 115 Kbps. It has a backplane current load of 1.2A at 5V DC and maximum power dissipation of 6.3W. It requires a remote I/O adapter port for connection. For installation, the 1771-DCM requires one slot on the 1771 I/O chassis. Keying bands for placing it in right I/O slots are between pins 16 and 18 for the upper connector and between pins 2 and 4 for the lower connector. For wiring, the 1770-CD Belden 9463 or equivalent cable must be used.
The 1771-DCM module has Power, Serial communication, Backplane communication, and Module Fault diagnostics Indicators. It supports serial communication and reads/writes data in parallel form. It has switches for options according to application requirements. It has a communication rate of 57.6K Baud up to 10,000 feet or 115.2K Baud up to 5000 feet. It has an I/O Rack Address and a Rack Size setting option for discrete data transfer. The 1771-DCM has a protected data option to prevent block transfer until the previous data transfer is completed.
Repair Services for 1771-DCM
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Our highly skilled technicians can repair your 1771-DCM. All of our repairs come with a 1 Year DO Supply Warranty. Please contact us for additional information about our repair process.
Revisions for 1771-DCM
Please refer to the manual for more information about the 1771-DCM such as the wiring diagrams, data sheets,
firmware information and migration or obsolescence details.
|Revision Part #
||Also Known as
||1771-DCM/A, Series A, Rev A
||1771-DCM/B, Series B, Rev B