Key Benefits
For thirty-five years or more, Toshiba DCS Products have been applied to process automation systems of power generation, water & wastewater, oil & gas, iron making, mining, chemical, paper & paper mill, and cement. In general, the system requirements for conventional DCS are high reliability, high availability, advanced control performance, and high capacity.
Overview
While a large-scale DCS is able to manage a few thousand loops per controller, it is expensive to introduce into a plant because of the complex redundant architecture used to reduce the risk of centralised control and operation.Nowadays the global process automation market is looking for DCS products that are easier to introduce with improved cost performance in addition to the conventional DCS requirements.
One practical solution is to introduce properly scaled DCS into each functional plant unit as needed. This reduces the risk of centralized control and operation at a reasonable cost.
To meet these real needs Toshiba launched a small-to-middle-scale DCS into the process automation market. The DCS, named type2 light, manages up to 1,000 tag objects including up to 128 control loops while maintaining inherited functions from Toshiba's large-scale DCS.
Reliability and Security
Previous DCS of Toshiba, V-series L2, needs two sets of four modules at least in the main unit to realise redundancy. The new DCS, type2 light needs only two sets of two modules to realise redundancy with lower power consumption achieved by using highly integrated technology.Inheritance from Toshiba DCS
Succeeding to Toshiba DCS features of Industrial Dual Ethernet, Intelligent Serial I/O, IEC61131-3 Programming, Standard Process Tags, and Real-Time Database of ONS Sever, type2 light fits into the existing TOSDIC-CIE/DS system, migrating from legacy DCS and utilizing existing user programs.Sufficient Tag Object Capacity for Small-to-Middle Scale Plant Unit
Up to 1000 process tag objects consisting of 384 indicators, 128 controllers, and 512 discrete devices are available, so that type 2 light is suitable for most of small-to-middle-scale plant units.Multi-Vendor
I/O system of the previous DCS, V-series L2, is Intelligent Serial I/O, which supports direct I/O modules to perform analogue/digital input/output. TC-net I/O provides multi roles of input/output from/to 3rd party devices via Modbus, FL-net, Profibus-DP, HART as well as native direct I/O, so that a multivendor networking DCS can be built.C&I Engineer-Oriented
In C&I engineering, the instrument loop diagram has been the foundation of system requirements for control application.Nowadays IEC61131-3 programming is supported by most DCS as well as PLC. There are big differences between the instrument loop diagram and the IEC61131-3 one, so most of C&I engineers and programmers have been struggling with the double maintenance this creates. To reduce the problem, nV-Tool supports Custom Symbols which are attachable to any Function Block of IEC61131-3. By preparing Custom Symbols of field devices and instrument balloons and attaching them to function blocks, you can draw, download and monitor instrument loop diagrams by using these symbols.
Environmental Harmony
IEC61131-3 Standard
IEC61131-3 is an international standard of control programming language and structure. type2 light supports four well-known languages, as follows.- LD: Ladder Diagram
- FBD: Function Block Diagram
- SFC: Sequential Function Chart
- ST: Structured Text
Integrated HMI for Small-to-Middle Scale: OIS-DS/Smart
Toshiba has been supplying DCS products of DPCS/MCS since the eighties, PCS/PCS-DS/V-series L2/L3 in the nineties, nv-series type2 in 2007. And furthermore, a new DCS for small-to-middle scale plant units, type2 light, has been launched into the process automation market in 2015. OIS-DS is an Integrated HMI subsystem that supervises all the Toshiba DCS shown above.
In addition, the functions of OIS-DS have been enhanced to supervise not only Toshiba DCS but also 3rd party PLC, by adding redundant PLCS (PLC Server) into the system.
