Distributed Control Systems (DCS)

Reliable control

Monitoring, operation and control of power plants are done by means of a distributed control system (DCS). Consequently, system availability is directly associated with overall plant availability. Therefore, a process management system has to be designed, structured, and configured in a manner that meets the high demands placed on availability, expandability, and flexibility. Mitsubishi Electric's solutions PMSX®pro and PMSX®micro have been developed to meet these demands.

Industrial plants are operated, monitored, and controlled by means of process management systems.

PMSX®pro has been designed to fully meet all requirements in terms of availability, efficiency, expandability, and flexibility. It also features a high level of harmonized hardware and software, and includes a finely tuned range of standardized automation equipment.

The process management concept adapts to the plant‘s process engineering structure. Maximum safety, utmost availability, and flexible expandability are obtained by structuring the plant horizontally into function units with specific control and automation tasks. In this way, we achieve a clearly structured, hierarchical and therefore transparent plant structure. Process-related redundancies are not cancelled by the control system.

For efficient plant and maintenance management, PMSX®pro provides consistent, plant-wide configuration and parametrization from a central point. The possibility of calling dynamic function diagrams, and the consistent forwards documentation ensure that the operators always have a clear process overview – also under critical operating conditions – and thus permit fast and confident response. What‘s more, the integrated Help function plus powerful tools for diagnostics, simulation, and quality assurance assist the personnel in efficient plant operation.

Benefits at a glance

  • Distributed system architecture and freely scalable topology

  • Utmost reliability and availability – up to 99.9% p.a.

  • Active and passive redundancies at all levels

  • Safe and overriding process control

  • Forwards documentation according to VGB-R 170 C

  • Dynamic function plans called directly from process graphics

  • Extremely powerful archiving functions

  • Intelligent and consecutive alarm management

  • Time stamping in the distributed input module groups

  • Inputs monitored for broken leads and short circuit

  • Automatic backup and recovery function

  • Comprehensive Asset Management tools

  • Use of proven, standardized technology

  • Expandable without interrupting plant operation

  • Secure linking to other networks, and remote access via a firewall

Technical specifications

System configuration (maximum values)
Networkable systems 30
Operating stations per system 60
Process stations per system 60
Data points per system 1,000,000
No. of process graphics per system 10,000
Printers per system 100
Automation stations per system 150

 

System performance
Display build-up time ≤ 1 s
Update rate of process data ≤ 1 s
Alarm resolution 1 ms
Timing precision of alarms 10 ms (typical)

 

Process control stations
Type 19-inch industrial housing
Data security (optional) RAID-1 /RAID-5 (hot swappable)
Network technology Ethernet (IEEE 802.3)
Max. data transfer rate 1,000 Mbit/s
Redundancy (optional) Power supplies, hard disks, cooling fans
Monitoring Temperatures, fan speeds

 

System bus
Network technology Ethernet (IEEE 802.3)
Network protocol TCP/IP
Transmission media Optic fiber links
Max. data transfer rate 1,000 Mbit/s
Redundancy Virtual ring structure
Network management SNMP, Web interface

 

Fieldbus
Communication standard Profibus-DP (IEC 61158)
Transmission media Fiber optic / RS 485
Max. data transfer rate 12 Mbit/s
Redundancy Ring topology
Field instrument management FDT/DTM

 

Operating and monitoring system
No. of display screens per workstation 1 to 4
No. of windows per screen 1 to N (adjustable)
Input devices Keyboard, mouse, touchscreen
No. of process graphics > 1,000
No. of trend displays > 1,000
No. of variables per trend display 18
Display of alarm texts 40 characters
Storable alarms/messages > 1,000,000

 

Engineering / programming
Graphical projecting IEC 61131-3
Documentation guidelines VGB-R 170C / IEC 61131-3

 

Automation
Make Mitsubishi System Q
Multi-processor system 1 to 4 CPUs
Redundancy 1-out-of-2 principle
Inputs/outputs per station 4,096/8,192 (remote)
Module replacement during operation Hot plug-in
Monitoring Open & short circuited leads
Time stamping In remote module

 

Expanded archiving
Storage capacity Up to 2 × 1.2 terabytes
Hard disks Up to 16 (hot swappable)
Data redundancy RAID-6
Redundancy Cooling fans, power supplies (hot swappable)

PMSX®micro allows users to operate, control and observe small plants, machines, processes or continuous production flows. The plant status, which enables a good overview of the plant at all times, is represented using process graphics. The plant is operated via operating graphics, which reproduce the detailed state of aggregates and make operation easy and convenient. If alarms or messages occur, the operator can navigate quickly and directly to the relevant process graphic, resulting in prompt and targeted response.

PMSX®micro has a full alarm and event system, which records all alarms and messages, displays them and stores them in a database in their correct sequence. This enables process flows to be traced in the event of disturbances or following changes. The operator can add annotations and comments about events or objects, which are then also available for sub- sequent analysis.

The data collected during operation can be viewed as an operator logbook, thereby highlighting all relevant data during production. Analog data such as measurements or counter readings, but also states such as On or Off can be stored in an archive and evaluated at any time.

Features PMSX®micro

  • PC standalone solution

  • Operating and observing

  • Alarm and event system

  • Control

  • Comprehensive reporting

  • Many analysis options

  • Maintenance system built-in

  • Operator Logbook

  • Engineering possible by end users and Sis

  • Cost-efficient, one-time main licence costs only

Your benefits

  • Control system on an industry-computer

  • Full functionality of a control system (DCS)

  • Cost-efficient, as only one-time main licence required

  • Proven and mature solution

  • Particularly durable industry-computer hardware

  • Complete DCS incl. network and automation station

  • User-friendly operation

  • Special feature: It is possible to expand the system subsequently into a larger control system.