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Schneider Electric PC-E984-685

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Part NumberPC-E984-685
ManufacturerSchneider Electric
TypeI/O Modules
Model #PCE984685
Warranty2 Year
Rating50/60 Hz, 24VDC,
115/230 AC, 1.0/0.5 A
Dimensions4 x 11 x 9 in.
Data Mem10K

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Repair Benefits

MRO can restore your failed PC-E984-685 to remanufactured condition and save you up to 75% compared to buying new. We offer standard repair pricing to ensure you the best value for your repair.

Our certified technicians use rigorous testing procedures to ensure your parts are restored to fully functioning condition. Our team proudly stands behind all repairs by providing a minimum 2-year warranty.

Our technicians have vast experience with most manufacturers and models. In addition to this PC-E984-685 we also repair drives, motors, PLCs and more, so if you don’t see the model you need, please contact us.

Core Exchange

If you are interested in getting credit for your faulty PC-E984-685, just let us know, and we can issue you an RMA to send it in as an exchange. Our exchange program provides you with savings and keeps us stocked for the next time you need anything.

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MRO Electric provides a 2-year warranty on every item we sell and repair. We stand behind all of our products and guarantee them for the full 2 years. If there is an issue with any of our products within the warranty period, we will evaluate the unit and repair or replace it under warranty.

Schneider Electric PC-E984-685 Overview

Modicon 984 Programmable Controller PCE984685

The Modicon 984 Programmable Controller PCE984685 is manufactured by Schneider Electric and is a part of the 984 Programmable Controllers series. These products are manufactured in France and are designed for Material handling, packaging, and textile machines usage. They come with a 2-year warranty from MRO Electric. We also carry I/O Modules from other manufacturers such as Modicon and ABB.

Performance and Capacity Characteristics

The 984 Programmable Controller model 984-685 is a device designed for slot mount. It has a logic-solve speed of 2.0 milliseconds per kiloword and is equipped with a 16-bit CPU. The user logic size can be configured as either 8K or 16K. The controller also has 4096 RAM state registers and 2048 mixed-state RAM discrete inputs. The maximum number of I/O bits per drop is 512 for both input and output, and the maximum number of I/O bits per system is 16384 for both input and output. The total number of discrete I/O is 2048, which can be any mix of inputs and outputs.


The 984 programmable controller is a PLC specifically designed for real-time control in industrial and manufacturing settings. With digital processing capabilities, it monitors the status of field devices through input modules, executes a user-defined logic program through its CPU, and then controls field device activity by sending signals to its output modules. This combination of input monitoring, program execution, and output control enables the 984 programmable controllers to perform a wide range of control tasks in real time.


The 984 controller line offers exceptional compatibility, a key benefit of its design approach. Regardless of their computational power, performance specifications, or hardware design, all 984 controllers share a consistent architecture. This ensures that the 984 instruction set, which defines the functional capabilities of the controller and is stored in the system firmware's executive PROM, contains common logic functions across all 984s. As a result, control logic created on a high-performance unit such as the 984-685 or 984B can be transferred to a smaller controller like the 984-145, as long as it has sufficient memory. Additionally, logic created on a smaller controller can be easily adapted to a larger unit. As your application grows, you can upgrade your controller hardware without having to rewrite your existing control logic.

The Modicon 984 group of programmable controllers offers a diverse selection of compact, mid-sized, and high-performance CPUs. Despite differences in hardware, all 984 controllers use a unified processing architecture and are programmed using ladder logic, a graphical language that resembles relay symbols. They also share a common set of instructions covering calculation, data transfer, matrix operations, and special applications. Modicon provides multiple networking options, enabling interconnection between multiple controllers and other devices to enhance control and data exchange in applications.

The design approach for 984 controllers enables decision-making based on controller capabilities, such as the quantity of discrete and analog/register points for programming applications, the number of I/O drops supported, and the efficiency, represented by the speed at which it processes logic and updates I/O modules, as well as its resistance to environmental factors.

984 Programmable Controller Performance and Capacity Characteristics

Model 984--685

Hardware Implementation: Slot mount

Logic Solve: 2.0 (ms/Kword)

CPU Size: 16 bits

User Logic Size: 8K/16K

State RAM Regs: 4096 RAM

State RAM Discrete: 2048 any mix

Maximum I/O Bits per Drop: 512 in/512 out

Maximum I/O Bits/System: 16384 in/16384 out

Total Discrete I/O: 2048 any mix

Max. Drops per System: 1 L, 31 R

Frequently Asked Questions (FAQ) for the Schneider Electric PC-E984-685 I/O Module

Q: What is the Schneider Electric PC-E984-685 I/O Module?

A: The PC-E984-685 is an I/O (Input/Output) module manufactured by Schneider Electric. It is designed for use in industrial automation systems to facilitate communication between various devices and control systems.

Q: What are the key specifications of the PC-E984-685 I/O Module?

A: The PC-E984-685 operates at a frequency of 50/60 Hz and supports power ratings of 24VDC, 115VAC, and 230VAC, with current ratings of 1.0A and 0.5A respectively. Its dimensions are 4 x 11 x 9 inches, providing a compact form factor for easy integration into control cabinets or panels.

Q: What is the memory capacity of the PC-E984-685 I/O Module?

A: The PC-E984-685 features 16K of user memory and 10K of data memory, offering ample storage capacity for storing control programs, data, and configuration settings.

Q: What communication ports are available on the PC-E984-685 I/O Module?

A: The PC-E984-685 has two MODBUS PLUS ports and one, enabling communication with other devices and systems within the industrial network.

Q: What are the typical applications of the PC-E984-685 I/O Module?

A: The PC-E984-685 is commonly used in industrial automation applications such as manufacturing, process control, and machinery automation, where reliable and efficient I/O communication is required.

Q: Is the PC-E984-685 I/O Module compatible with specific Schneider Electric systems?

A: Yes, the PC-E984-685 is designed to be compatible with Schneider Electric's range of automation systems, including PLCs (Programmable Logic Controllers) and other control devices.

Q: Does the PC-E984-685 I/O Module come with any certifications?

A: While specific certifications may vary, Schneider Electric products are typically designed and manufactured to meet industry standards for performance, reliability, and safety.

Q: Can the PC-E984-685 I/O Module easily integrate into existing automation systems?

A: The PC-E984-685 is designed for easy integration and installation, with standard mounting options and communication protocols for seamless integration into existing industrial setups.

Contact Us Today For More Information About Schneider Electric Products

Check out the rest of our Schneider Electric product line. Whether it's using our online instant quote feature, giving us a call at (800) 691-8511, or emailing us at, we strive for customer satisfaction first. This means lower prices and better service for you. For more products like PC-E984-685, take a look at more from our I/O Modules line. If your current unit has gone bad, take advantage of our Core Exchange program for the most inexpensive route. You can learn more about this program on our FAQ page here. We offer a repair service on all of our PC-E984-685 products that keep your downtime to a minimum. To stay up to date on manufacturer news, as well as access any of our datasheets, manuals, or other documentation, we suggest you take a look at our blog.

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