Allen-Bradley 1771-DCM Direct Communication Module
$123.00
$320.00
Description
Allen-Bradley 1771-DCM Direct Communication Module
The Allen-Bradley 1771-DCM, also cataloged as the 1771-DCM Direct Communication Module, operates as a dedicated hardware component for Remote I/O serial communication and data transfer within PLC-5 control system platforms. The module provides direct processor-to-processor communication through RIO protocol with discrete and block transfer functions.
Hardware Specifications
| Parameter | Specification |
|---|---|
| Model | 1771-DCM |
| Brand | Allen-Bradley |
| Origin | United States |
| Weight | 1.75 lbs |
| Dimensions | 25.4 cm x 2.5 cm x 15.2 cm |
| Operating Temp | 32 to 131 deg F (0 to 55 deg C) |
| Power Consumption | 1.2 A at 5 VDC from PLC-5 chassis backplane |
| Module Type | Direct Communication Module (DCM) |
| Product Line | PLC-5 |
| Communication Protocol | Remote I/O (RIO) |
| Transmission Rate | 57.6 Kbaud at 10,000 ft cable length; 115.2 Kbaud at 5,000 ft cable length |
| Transfer Modes | Discrete Data Transfer and Block Transfer |
| Discrete Data Capacity | Up to 7 words plus 1 status word |
| Block Transfer Capacity | Up to 63 words plus 1 status word |
| Response Time | 15 ms |
| Communication Cable | Belden 9463 or equivalent |
| Humidity Range | 5-95 % relative humidity |
EtherNet/IP and PLC Backplane Communication Characteristics
The 1771-DCM provides direct serial communication between supervisory processors and local PLC processors through the Remote I/O network interface. The module supports deterministic PLC-5 data exchange using RIO communication architecture and block-transfer operations.
The communication design supports industrial control network integration through defined transmission rates and cable distance configurations. Backplane bus communication provides data exchange between the module and PLC-5 processor using block-transfer instructions. The module supports I/O density scaling by transferring discrete data and larger block data structures through the RIO channel.
Frequently Asked Questions
Q: What type of communication protocol is supported by the 1771-DCM?
A: The module supports Allen-Bradley Remote I/O (RIO) protocol through its serial communication interface.
Q: What backplane power requirement applies to the 1771-DCM?
A: The module requires 1.2 A at 5 VDC from the PLC-5 chassis backplane.
Q: What transfer modes are available with the 1771-DCM?
A: The module supports discrete data transfer and block transfer operations. Discrete transfer supports up to 7 words plus 1 status word, while block transfer supports up to 63 words plus 1 status word.
Field Installation Guidelines
Install the 1771-DCM module into a compatible PLC-5 1771 I/O chassis slot using the correct keying configuration. Verify chassis power capacity before installation and disconnect power during module insertion or removal.
Use the specified communication cable type or an equivalent cable suitable for Remote I/O applications. Route communication wiring separately from high-voltage and high-current conductors to reduce electromagnetic interference. Maintain proper cable shielding and grounding practices according to industrial installation standards.
Confirm RIO node configuration, cable routing, and PLC-5 block-transfer parameters before placing the module into operation.
Features
Minimum Order Quantity (MOQ)
We welcome bulk orders and have a minimum order quantity of just one unit.
Certificates and Documentation
Upon request, we can provide all necessary documentation, including Certificates of Origin/Conformance and other required export documents.
Delivery Time
For items in stock, we aim to deliver within 1-3 days after payment confirmation. Items with specified lead times will be delivered according to the quoted schedule.
Payment Methods
We accept 100% T/T (Telegraphic Transfer) payment before shipping. For items with lead times, a 30% deposit is required upfront, with the remaining 70% due before shipment. For RMB transfers, please contact us if you have an agent in China.
Warranty
We offer a standard one-year warranty on all new and original items. If you require an extended warranty, please contact us for additional cost details.
Refund and Return Policy
Your satisfaction is important to us. If you need to return an item, it must be done within 30 days of the order date. The product must be unused, unopened, and in its original packaging with all accessories included. Refunds are processed within 5-7 business days after we receive the returned item. Please note that shipping and related charges are non-refundable.
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