1771-DCM

Overview

The Allen-Bradley 1771-DCM is a direct communication module for PLC-5 systems, enabling Remote I/O (RIO) data transfer over discrete or block transfer modes.

Communication Capabilities

• 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)

• Communication cable: Belden 9463 or equivalent

• Transfer modes: Discrete Data Transfer, Block Transfer

• Discrete transfer: Up to 7 words + 1 status word

• Block transfer: Up to 63 words + 1 status word

• PLC compatibility: Block transfer with PLC-5 processor

• Operation support: BASIC programs and C programs

Power and Connections

• Backplane current: 1.2 A

• Compatible keying: Between 2–14, 16–18

• Wiring arm: 1771-WN

Memory

• Bytes: 32 KB

• Bits: 8 Kb

Environmental Conditions

• Operating temperature: 32–131 °F

• Relative humidity: 5–95%

---