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1771-DCM | Allen-Bradley Direct Communication Module
- Regular price
- $1,455.00
- Sale price
- $1,455.00
- Regular price
-
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Product Description P/N: 1771-DCM
Description
The Allen-Bradley 1771-DCM is a Direct Communication Module designed to enable data exchange between supervisory and local processors using Remote I/O (RIO) protocol. It supports discrete transfers of up to 7 words plus 1 status word and block transfers of up to 63 words plus 1 status word. The module operates at baud rates of 57.6K or 115.2K over Belden 9463 cable and draws 1.2 A from the 1771 backplane.
Technical Specifications
| Condition | New/Never Used Surplus |
| Brand | Allen-Bradley |
| Category | Communication Module |
| Part Number | 1771-DCM |
| Subcategory | Direct Communication Module |
| Module Type | Direct Communication Module (DCM) |
| Supported Protocol | Remote I/O (RIO) |
| Transmission Rate | 57.6K baud (10,000 ft) / 115.2K baud (5,000 ft) |
| Discrete Data Transfer | Up to 7 words + 1 status word |
| Block Transfer Data | Up to 63 words + 1 status word |
| Backplane Current Draw | 1.2 A |
| Module Scan Time | 1.3–5 ms |
| Response Time | 15 ms |
| Memory Capacity | 32 KB (bytes) / 8 Kbits |
| Operating Temperature | 32–131 °F |
| Storage Temperature | -40–185 °F |
| Relative Humidity | 5–95% non-condensing |
| Communication Cable | Belden 9463 or equivalent |
| Wiring Arm | 1771-WN |
| Coating | Conformal coat |
| Dimensions | 3.5 × 6.5 × 2.0 in (89 × 165 × 51 mm) |
| Keying Positions | Between 2–14 and 16–18 |
Information About 1771-DCM
The 1771-DCM is part of the Allen-Bradley 1771 I/O platform and provides a serial interface that links PLC processors across a Remote I/O network. Its design supports both discrete and block transfer modes, enabling flexible data handling between PLC-2, PLC-3, PLC-5, and 1771-ASB adapter-based systems. The module integrates into a single slot of the 1771 chassis and includes DIP switch configuration for baud rate, rack size, data protection, and address settings. It is typically used in distributed control systems that require reliable processor-to-processor communication for exchanging data table values, status information, and control signals.
Key Features:
- Direct RIO communication: Facilitates processor-level data exchange using Remote I/O protocol.
- Dual transfer modes: Supports discrete (up to 7 words + status) and block transfers (up to 63 words + status).
- High transmission rates: Operates at 57.6K baud over 10,000 ft and 115.2K baud over 5,000 ft.
- 1771 chassis compatibility: Occupies one slot and uses 1771-WN wiring arm.
- DIP switch configuration: Allows setup of baud rate, rack size, transfer mode, and data protection.
- Diagnostic indicators: Provides LED alerts for power, serial activity, backplane status, and module faults.
- Broad processor support: Compatible with PLC-2, PLC-3, PLC-5, and 1771-ASB-based systems.
- Conformal coating: Enhances environmental resistance for industrial applications.
The 1771-DCM delivers the reliability and precision required for Remote I/O communication in distributed PLC systems.
Description
The Allen-Bradley 1771-DCM is a Direct Communication Module designed to enable data exchange between supervisory and local processors using Remote I/O (RIO) protocol. It supports discrete transfers of up to 7 words plus 1 status word and block transfers of up to 63 words plus 1 status word. The module operates at baud rates of 57.6K or 115.2K over Belden 9463 cable and draws 1.2 A from the 1771 backplane.
Technical Specifications
| Condition | New/Never Used Surplus |
| Brand | Allen-Bradley |
| Category | Communication Module |
| Part Number | 1771-DCM |
| Subcategory | Direct Communication Module |
| Module Type | Direct Communication Module (DCM) |
| Supported Protocol | Remote I/O (RIO) |
| Transmission Rate | 57.6K baud (10,000 ft) / 115.2K baud (5,000 ft) |
| Discrete Data Transfer | Up to 7 words + 1 status word |
| Block Transfer Data | Up to 63 words + 1 status word |
| Backplane Current Draw | 1.2 A |
| Module Scan Time | 1.3–5 ms |
| Response Time | 15 ms |
| Memory Capacity | 32 KB (bytes) / 8 Kbits |
| Operating Temperature | 32–131 °F |
| Storage Temperature | -40–185 °F |
| Relative Humidity | 5–95% non-condensing |
| Communication Cable | Belden 9463 or equivalent |
| Wiring Arm | 1771-WN |
| Coating | Conformal coat |
| Dimensions | 3.5 × 6.5 × 2.0 in (89 × 165 × 51 mm) |
| Keying Positions | Between 2–14 and 16–18 |
Information About 1771-DCM
The 1771-DCM is part of the Allen-Bradley 1771 I/O platform and provides a serial interface that links PLC processors across a Remote I/O network. Its design supports both discrete and block transfer modes, enabling flexible data handling between PLC-2, PLC-3, PLC-5, and 1771-ASB adapter-based systems. The module integrates into a single slot of the 1771 chassis and includes DIP switch configuration for baud rate, rack size, data protection, and address settings. It is typically used in distributed control systems that require reliable processor-to-processor communication for exchanging data table values, status information, and control signals.
Key Features:
- Direct RIO communication: Facilitates processor-level data exchange using Remote I/O protocol.
- Dual transfer modes: Supports discrete (up to 7 words + status) and block transfers (up to 63 words + status).
- High transmission rates: Operates at 57.6K baud over 10,000 ft and 115.2K baud over 5,000 ft.
- 1771 chassis compatibility: Occupies one slot and uses 1771-WN wiring arm.
- DIP switch configuration: Allows setup of baud rate, rack size, transfer mode, and data protection.
- Diagnostic indicators: Provides LED alerts for power, serial activity, backplane status, and module faults.
- Broad processor support: Compatible with PLC-2, PLC-3, PLC-5, and 1771-ASB-based systems.
- Conformal coating: Enhances environmental resistance for industrial applications.
The 1771-DCM delivers the reliability and precision required for Remote I/O communication in distributed PLC systems.