1771 I/O modules

The 1771 I/O product line provides a full range of digital and analog I/O to meet your application needs in a modular assembly - including intelligent I/O modules.

• Digital I/O modules have digital I/O circuits that interface to on/off sensors such as pushbutton and limit switches; and on/off actuators such as motor starters, pilot lights, and annunciators. These outputs are directly controlled by the state of corresponding bits in the PLC data table. These inputs directly control the state of corresponding bits in the PLC data table.
• Analog I/O modules perform the required A/D and D/A conversions to directly interface analog signals to PLC data table values using up to 16-bit resolution. Analog I/O can be user-configured for the desired fault-response state in the event that I/O communication is disrupted. This feature provides a safe reaction/response in case of a fault, limits the extent of faults, and provides a predictable fault response.
• N-series analog I/O modules provide high (1000V) isolation between channels. Their I/O connection points are on remote termination panels (RTPs) which reduce installation costs and allow you to replace module without disturbing current loop. RTPs have optional fuses and resistors for user-defined termination flexibility.
• Intelligent I/O modules are available to enhance your control system. These modules include process control modules, positioning modules, and specialized modules such as the high-speed logic controller module and the configurable flowmeter module. Each provides a unique easy-to-use interface between the I/O (digital and/or analog) circuits and the PLC processor.

This modular hardware design uses cost- and space-effective means to add I/O to your control system. These modules can be used in:

• a processor-resident local I/O chassis of a PLC-5 controller
• in a PLC system on an extended-local I/O link
• in a PLC system on a ControlNet network
• in a PLC system on a Universal Remote I/O link
• in an SLC system on a Universal Remote I/O link

Allen-Bradley/Rockwell Automation, 1 Allen-Bradley Drive. Tel: 216-646-5000; Fax: 216-646-3525.