RTU and PLC products:
(1) the scope of applications:
RTU is mainly used in near field devices, so the RTU to working environment requirement general:
RTU environmental requirements:
Working temperature: - 40 degrees to 75 degrees
Storage temperature: - 40 degrees to 85 degrees
Relative humidity: 5% to 95%;
RTU products with reliable quality and features of the extreme working temperature of environment, suitable for all kinds of applications, all-weather not restricted by environment and geography,. 253
PLC to the environment requirement: 253
Working temperature: 0 to 55 degrees; 253
Storage temperature: - 40 degrees to 70 degrees;
Relative humidity: 5% to 95%;
PLC products is more suitable for the application of the indoor environment, a narrow temperature range.
(2). Communication protocol and flexibility
RTU products have more communication interface
RTU product usually have three to five or more communication interface, such as RS232, RS485, mainly ADAPTS to the field of all kinds of smart meters and all kinds of convenient access controller;
With support for multiple communication protocol MODBUS RTU products and DNP3 protocol;
Support new special protocol interface drive function. Can be connected with other different types of equipment, especially suitable for SCADA system application;
PLC communication interface and communication protocol is a single, suitable for relatively fixed and unified station control system.
(3) the RTU function
RTU in applications in addition to some of the most basic similar functions and PLC for some industry more proprietary technology, has some industry special functions, such as gas RTU have AGA algorithm, the wellhead RTU has the special control algorithm, etc. For small sites, both about the same, the application scope of RTU series has the storage space, greater than the PLC, in addition, the RTU using built-in flow calculation program, can replace the flow computer, directly used for measurement, the historical record storage, etc.
In configuration points, both in terms of analog, RTU is slightly better than a PLC; RTU is mainly for field application environment Settings, the requirement of environment than PLC series more broad. From the point of memory space and the supplementary function, RTU is superior to the PLC. Environment is a good place for site, PLC will be more economical; To use environment on site is poor, such as the oil industry of irrigation area monitoring, gas pipelines, oil and gas well site monitoring, municipal pipe network, and many other outdoor environmental factors using RTU products are more appropriate. Together two kinds of products, each has its features and characteristics, and is aimed at the application scope of also is not the same.