Overview
The Allen-Bradley 1784-PCM2 is a legacy communication programming cable designed to connect PLC-2 and Mini PLC-2 processors directly to the 1784-PCMK PCMCIA communication card. This cable assembly enables engineers and technicians to perform program downloads, uploads, messaging, and controller diagnostics from a portable laptop on the factory floor, providing essential connectivity for older Allen-Bradley automation systems requiring maintenance and updates.
Key Features
- Direct PLC-2 Connection: 15-pin D-shell connector connects to the appropriate interface on the PLC-2/Mini PLC-2 controller
- PCMCIA Card Compatibility: Used to connect Allen-Bradley PLC-2 controllers to Allen-Bradley 1784-PCMK cards, a PCMCIA Type II card which enables laptops and notebooks with card slots to interface with devices on the DH-485 and DH networks and with remote I/O networks
- Generous Cable Length: 3.16 meters or 10.4 feet total length
- Diagnostics Support: A loopback connector can be used with the 1784-PCM2 cable assembly for a diagnostics loopback test
- Strain Relief Design: Durable connector with secure cable retention for factory-floor use
Technical Specifications
- Connector Type: 15-pin D-shell (connects to PLC-2/Mini PLC-2)
- Cable Length: 3.16 meters (10.4 feet)
- Compatible PCMCIA Card: 1784-PCMK (Series A for full PLC-2 support)
- Network Protocols: DH-485, DH+, Remote I/O
- Supported Controllers: PLC-2, Mini PLC-2
- Connector Finish: Shielded, with strain relief wedges
Typical Applications
The 1784-PCM2 is ideal for:
- Factory-floor programming and commissioning of legacy PLC-2 systems
- Troubleshooting and diagnostics on existing PLC-2 installations
- Program upload and download between portable computers and PLC-2 processors
- Remote I/O and DH-485 network communication via PCMCIA interface
- Maintenance and support of legacy industrial control systems where PLC-2 hardware remains in production
Compatibility & Replacements
Compatible With
- PLC-2 processors
- Mini PLC-2 controllers
- 1784-PCMK PCMCIA communication card (Series A recommended for full PLC-2 support)
- DH-485 network interfaces
- DH+ networks
- Remote I/O networks
- Portable computers with PCMCIA Type II card slots (laptops, notebooks)
Replaces / Drop-In Replacement For
- Original OEM 1784-PCM2 cable assemblies
- Damaged or discontinued 1784-PCM2 direct-connect cables
- Previous revisions of the 1784-PCM2 series
Works With
- Allen-Bradley PLC-2 programming software (AI-2 software for Series A configurations)
- DH-485 communication protocol
- DH+ protocol (via enhanced controllers and adapters)
- Remote I/O protocol
- Loopback connectors for cable diagnostics and testing
