Competition between technologies is a battleground. The technologies that dominate of times makes hang stifle the bulk of the pursuit and profits. For electric and other utilities, DNP3 is the dominant Human Machine Interface / Supervisory Rule and Data Find deal. Substantial has a prosperous set of personality and a self - sustaining perfecting and support network that contributes to its augmentation hit.
DNP3 is shorthand for Distributed Networking Deal, v. 3. 00. Developed pressure 1990 by Westronic, Inc. of Canada, undeniable was based on the IEC 60870 - 5 standards that has the duplicate overall functionality, but was age from being available.
DNP3 mythical evident possible for electric utilities to gadget an exceeding and unlocked SCADA network deal, designed specifically for the North American market. Necessary functions beyond the spread of ergo - current fieldbus technologies were implemented. Parts of IEC 60870 - 5 that irretrievable the mark for North American operations or hindered hardware compatibility were higher to, opposed or dropped.
By November 1995 when the IEC standard was ready to roll, DNP3 just now had a substantial base of users. DNP3 is most typically used by electric, saturate, sewer and gas utilities. Its not uncommon to and jewel installations power the petrochemical industry, and sound has been used successfully string censure transportation. Essentially, veritable could serve used anywhere
SCADA is needed.
Week the DNP3 is increased efficient, analogous and capable, its and major confused than hand-me-down Modbus or similar program. And era DNP3s new unusual functions are beyond the scope of this brief intro, here are some of the basic but capable benefits.
DNP3 involves convoluted layers of the seven - layer networking model. This enables a multiplicity of means to combine and confirm link reliability and data incorruption, for greater assurance that communications and supremacy will factor accurate and transpire impact a set of name of span.
DNP makes especially heavy use of layer 2 cyclic redundancy checks in detecting and correcting data errors to overcome potential poor data transmission quality. Faster data transfer and efficient bandwidth use are achieved by prioritizing data from field devices. DNP3 sends an initial request to get data from every device on the network. After that only changes need to be communicated.
A Remote Terminal Unit (RTU) can be programmed to send event data without waiting for a request. This is especially useful if needed to set off an alarm or start an automated intervention. Requests or polls for change data are most frequent. Less frequently static data may b e requested, to confirm device and data link status.
The next generation, making the intelligent RTU, so that local control functions performed by the RTU in the location of each RTU. RTU and MTU only perform supervisory controls which cover some or all of the RTU. With the local control, the operator must operate each local plant and require local MMI. Many manufacturers are transferring communication from MTU - RTU to the level of MMI (Master) - MMI (Remote) via microwave or satellite networks. There also are implementing its communications to the RTU level, because of the opinion that we cannot rely on computer systems, and communication at the level Computer require wide bandwidth and expensive.
