Controllogix Digital I O Modules

[Deandra Uleman]

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The ControlLogix architecture provides a wide range of input and output modules to span many applications, from high-speed digital to process control. The ControlLogix architecture uses Producer/Consumer technology, which allows input information and output status to be shared among multiple ControlLogix controllers.

Each ControlLogix I/O module mounts in a ControlLogix chassis and requires either a

removable terminal block (RTB) or a 1492 interface module (IFM) to connect all field-side wiring. RTBs and IFMs are not included with the I/O modules. They must be ordered separately.

Choose from digital, analog, RTD, motion, thermocouple, and specialty modules. Further options include field-side diagnostics, individually isolated inputs and/or outputs, and electronic fusing. Each module requires a remote terminal block (RTB).

Allen-Bradley delineates between the various digital DC modules by sorting them into two categories: Sinking and Sourcing. As an engineer designing your own system it will help you to understand the difference between these two options. Here is the definition as given by Allen-Bradley:

There are two methods of providing wiring connections between the 1756 Input/Output Modules and your plant wiring system: Removable Terminal Blocks (RTBs) and prefabricated wiring cable systems that attach directly to the module. Descriptions of both options are listed below. Note that if you select the RTB option and are using 14 gauge or heavier wire you will need to select an extended depth RTB housing (1756-TBE) for each RTB used.

This course is designed to familiarize plant technicians with the functions, architecture, and software in use in the ControlLogix PLC platform. Participants will learn basic skills to comfortably interact with the programming software, and to communicate with the PLC processor via USB cable.

Unique features of this systems such as the tagged system of memory addressing will be explained. Participants will learn to use the built in search, monitoring and diagnostic features of the software. Basic routine edits and modifications to instructions such as timers & counters will also be covered. Troubleshoot field wiring to digital input/output modules.

Activity: Modify timers and counters, add new input, output and other bit level instructions. Work with word compares as well as compute and math instructions. Modify the light show program.

ControlLogix & RSLogix 5000 Basics is the first in a three course series on ControlLogix and RSLogix 5000. After completing this course, you can take our level 2 class, ControlLogix & RSLogix 5000 Intermediate.

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