If you cannot find a data logging system that meets your I/O requirements or if you need a distributed system to monitor multiple points spread across a factory floor or several buildings, we can custom configure a data logging system using Modbus based devices. These systems consist of 3 parts:
- One or more loggers that manage the data collections, storage and alarming functions
- Analog and digital I/O modules that receive the sensor inputs and provide necessary analog or digital outputs
- A communications bus to interconnect the loggers and I/O modules
- Optional HMI to display data and control the system
The Modbus communications standard provides a way to seamlessly tie all of these devices together to build a system that is customized to fit your exact needs.
Typically one logger will be designated as the system master. This logger will manage the communications between the other Modbus devices, either reading or writing data. It will also serve as the central repository for all of the data and provide the alarming functions if necessary.
Modbus I/O Modules
We offer a variety of Modbus I/O modules to measure temperature, voltage, current, digital state or pulse signals. If your application requires control or alarm outputs, we can also supply digital, relay, voltage or current output modules to interface with other devices.
A key feature of the Modbus protocol is that it allows communications between devices using a number of different physical interconnections. The most common is Modbus on an RS-485. This is a 2 wire serial interface that allows communication between devices up to 4000 feet apart. Several of the data loggers also provide support for Modbus over a TCP/IP network connection. This allows the system to be distributed over longer distances, between different buildings in a plant, on a campus or even across states. A relatively new option is Modbus via a wireless network. We offer Airgate devices from Novus that provide a range of up to 3000 feet using an industrial radio or a Cellular model that provide virtually unlimited range.
Some customers would like the ability to view live data, alarms and charts on the plant floor without a PC or be able to directly control the operation of the data logger. For this, we can provide an HMI with a touch screen and a custom page(s) to allow easy visualization of measured parameters and allow various control functions such as starting or stopping the logger, adjusting alarm set points or manually controlling outputs.
Not sure what you need?
Download our guide on "Choosing the Right Data Logger for Your Application".