Part Number: PC-E984-685
Manufacturer: Schneider Electric
Type: I/O module
Guarantee: 1 year
Rating: 50/60 Hz, 24VDC,
115/230 AC, 1.0/0.5 amps
Dimensions 4 x 11 x 9 inches
User MEM: 16 km race
Data memory: 10K race
Ports: 2 MODBUS and 1 MODBUS PLUS

Performance and capacity characteristics
The 984 Programmable Controller Model 984-685 is a device designed specifically for slot mounting. It has a logic solution speed of 2.0 milliseconds per thousand words and is equipped with a 16-bit CPU. The user logical size can be configured as 8K or 16K. The controller also has 4096 RAM status registers and 2048 mixed state RAM discrete inputs. The maximum I/O bits per drop for input and output are 512, and the maximum I/O bits per system for input and output are 16384. The total number of discrete I/ OS is 2048 and can be any combination of input and output.

design
The 984 Programmable controller is a PLC designed for real-time control in industrial and manufacturing environments. With its digital processing capabilities, it monitors the state of field devices through the input module, executes user-defined logic programs through its CPU, and then controls field device activity by sending signals to the output module. This combination of input monitoring, program execution, and output control enables the 984 programmable controller to perform various control tasks in real time.

compatibility
The 984 controller family has excellent compatibility, which is a key advantage of its design approach. Regardless of their computing power, performance specifications, or hardware design, all 984 controllers share a consistent architecture. This ensures that the 984 instruction set (which defines the functions of the controller and is stored in the executive PROM of the system firmware) contains all the common logic functions of the 984. Therefore, control logic created on a high-performance unit such as 984-685 or 984B can be transferred to a smaller controller such as 984-145 as long as it has enough memory. In addition, 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 series of programmable controllers offers a wide range of compact, mid-size, and high-performance cpus. Despite hardware differences, all 984 controllers use a uniform processing architecture and are programmed using ladder logic, a graphic language similar to relay symbols. They also share a set of general instructions covering computation, data transfer, matrix operations, and special applications. Modicon offers a variety of networking options that support interconnections between multiple controllers and other devices to enhance control and data exchange in applications.

The 984 controller’s design approach enables decisions to be made based on the controller’s capabilities, such as the number of discrete and analog/register points for programming applications, the number of I/O drops supported, and its efficiency (expressed by how quickly it processes logic and updates I/O modules), as well as its resistance to environmental factors.

984 Programmable controller performance and capacity characteristics
Models 984-685

Hardware implementation: Slot installation

Logic solution: 2.0 (ms/Kword)

CPU size: 16 bits

User logical size: 8K/16K

Status RAM Registry: 4096 RAM

State RAM discrete: 2048 arbitrarily mixed

Maximum I/O bits per drop: 512 input /512 output

Maximum I/O bits/system: 16384 input /16384 output

Total number of discrete I/ OS: 2048 arbitrarily mixed

Maximum droplet per system: 1 L, 31 R