PLC-5 Control System

Bulletin 1785 PLC-5® programmable logic slcpowersupplycontrollers (PLCs) offer flexibility in programming, network, and I/O Designed for larger sequential and regulatory control applications with specialized I/O requirements, PLC-5 control systems bring together existing and new system through networks such as EtherNet/IP™, ControlNet™, and DeviceNet™.  Embedded network ports in PLC-5 controllers enable connectivity to a wide range of devices including MicroLogix™, SLC™ 500, CompactLogix™, and ControlLogix® controllers, letting you expand your control system without additional training investments




  • Reliability with a Mean Time Between Failure (MTBF) rating that exceeds 400,000 hours
  • 6 K words through 100 K words user memory

Backup options:

  • ControlNet™ Hot Backup module provides control of outputs if the primary controller shuts down
  • PLC-5® Backup Communication module helps increase the fault tolerance of systems controlling I/O on a remote I/O link

I/O support:

  • Monitor and control I/O across ControlNet, DeviceNet™, and Universal Remote I/O links
  • Forcible I/O ranges from 512 through 3072 I/O
  • Maximum remote I/O locations ranges from 5 through 125

Communication ports:

  • On-board ports for DH+, Universal Remote I/O, and RS-232-C/RS-422-A/RS-423-A communication
  • Ethernet or ControlNet dual-media ports included on some controllers
  • Separate modules provide additional communication ports


  • 1785 PLC-5 Controllers
  • 1771 Communication Modules
  • 1771 Universal I/O Modules
  • 1771 Power Supplies
  • 1771 Chassis


PLC-5 Controllers

Bulletin 1785 PLC-5® controllers are available in a range of I/O capacity and memory sizes. Our controllers have on-board Universal Remote I/O scanner ports and optional communication modules. You can connect our controllers in a variety of networks for distributed processing and I/O control. Selected models of PLC-5 controllers have on-board ports for Ethernet™, ControlNet™, or Extended Local I/O communication.

PLC-5 Communications

Bulletin 1771 PLC-5® Communication Modules let you add another communication port to the PLC-5 controller. This adds network capability beyond the available on-board ports.

Universal I/O

Bulletin 1771 Universal I/O provides a full range of digital, analog, and specialty I/O for a wide variety of applications. Use Universal I/O modules in a local I/O chassis of a PLC-5® system. Or, use an I/O communication adapter module to place I/O in a chassis at a location remote from the controller.

PLC-5 Power Supplies

Bulletin 1771 PLC-5® power supplies provide 5V DC to power installed controllers or communication adapters and I/O modules in a 1771 chassis. Both chassis-based and stand-alone power supplies are available. They support a range of AC and DC input voltages.

PLC-5 Chassis

The PLC-5 system requires a 1771 chassis to contain the various modules. Chassis are available in sizes up to 16-slots to fit your application requirements. The backplane provides a communication path between the I/O modules and either the processor module or the I/O adapter module.


Frequently Viewed Publications

1785 PLC-5 Programmable Controllers Selection Guide 1785-SG001


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