The Allen-Bradley 1784-PCMK (1784PCMK Communication Card) provides PC-based communication access to DH+, DH485, and RIO networks through a compact PCMCIA Type II hardware interface.

Catalog Identification

The supplied data identifies 1784-PCMK as a communication card for DH+, DH485, and RIO networks. The alternate catalog reference is 1784PCMK. The supplied product text also describes the card as a DeviceNet communication card; this conflicts with the stated DH+, DH485, and RIO function, so DeviceNet support is not treated as a confirmed specification.

Electrical and Mechanical Data

PLC-5 Network Communication

The 1784-PCMK is specified for PC-based access to Allen-Bradley DH+, DH485, and RIO communication networks. Its PCMCIA Type II form factor allows the communication hardware to be installed directly in a compatible host computer interface.

The card power specification is 160 mA at 5 VDC, corresponding to the stated 0.8 W power dissipation. Communication-port immunity is specified at +/-1 kV EFT/B and +/-2 kV line-earth surge transient conditions.

The supplied information does not define communication baud rates, maximum network nodes, cable length, software driver versions, or protocol-specific timing. These parameters should be verified against the applicable Allen-Bradley documentation.

Ordering Configuration

• 1 x Allen-Bradley 1784-PCMK Communication Card
• Catalog reference: 1784PCMK
• 68-pin communication interface
• PCMCIA Type II card format
• Communication cables and host PC accessories are not specified in the supplied data
• Software, drivers, and configuration utilities are not included in the stated hardware specification

Installation and Handling

PCMCIA Installation

• Verify that the host computer provides a compatible PCMCIA Type II interface.
• Insert the card without forcing the connector or card housing.
• Confirm the host configuration before connecting network communication cables.

Network Wiring

• Use the applicable cable and termination arrangement for the selected DH+, DH485, or RIO network.
• Keep communication wiring separated from motor, contactor, and high-voltage conductors where practical.
• Avoid sharp cable bends and excessive mechanical loading at the card connector.

Shielding and Grounding

• Follow the network-specific shielding and grounding arrangement.
• Avoid connecting cable shields in a manner that creates unintended ground-current paths.
• Inspect the 68-pin connector and communication cable before energizing the system.

Thermal Considerations

• The stated power dissipation is 0.8 W.
• Do not obstruct the host computer ventilation path around the PCMCIA interface.
• Allow the card to cool before handling after extended operation if the host enclosure has restricted airflow.

Frequently Asked Questions

• What networks are specified for the 1784-PCMK?

  The supplied product parameters identify DH+, DH485, and RIO as the supported communication networks.

• What host interface does the card use?

  The card uses a PCMCIA Type II form factor. The supplied information does not specify additional host bus requirements.

• What connector is specified?

  A 68-pin connector is listed in the supplied product information. The exact pin assignment is not provided and should be taken from the applicable manual.

• What is the card power requirement?

  The specified card power is 160 mA at 5 VDC. The listed power dissipation is 0.8 W.

• What is the storage temperature range?

  Storage temperature is specified as -20 to 65 deg C, equivalent to -4 to 149 deg F.

• Is the card suitable for hot swapping?

  Hot-swap capability is not established by the supplied data. Remove or install the card only according to the host computer and Allen-Bradley installation procedure.

• What communication-port immunity is specified?

  EFT/B immunity is listed as +/-1 kV at 5 kHz on communication ports, while surge transient immunity is +/-2 kV line-earth (CM).

• Does the supplied data confirm DeviceNet support?

  No. Although the source description mentions DeviceNet, the stated product parameters identify DH+, DH485, and RIO. DeviceNet capability therefore remains unverified.