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MIDIAS

Multiprocessor Distributed Automatization System with Wide Variability

The MIDIAS system consists of one or more operator’s stations (PC) and one or more technological stations (PLC) in the number and configuration determined by the requirements of the technological process. The stations are mutually interconnected by means of buses MIDIAS-BUS and H-BUS.

Communication in the MIDIAS system

The operator’s and process stations are interconnected by several communication channels which handle specific requirements of the system. There are three types of communication:

Communication in LAN – interconnects individual PCs, serves especially for interconnection of the MIDIAS control system with the customer’s computer network.
Serial bus MIDIAS-BUS - interconnects the operators’ stations with the process ones, serves especially for configuration of the process stations, setting of parameters and data gathering to the operators’ stations.
Serial bus H-BUS – interconnects mutually individual process stations, serves especially for fast data transfer between individual station. The serial buses MIDIAS-BUS and H-BUS may be implemented in various ways:
- by means of the RS 485 or RS 232 line,
- by means of the phone line and modems,
- by means of the radio network,
- by means of the power mains (230V~) and modems.

MIDIAS process station

The MIDIAS process stations are microcomputers of industrial variant, which perform (even autonomously) the control and regulation algorithms, provide direct contact with the controlled technology.

Certification of the MIDIAS station

Both variants of the process station are manufactured in accordance with Act 22/97 Coll. ("Declaration of Conformity" – CCZ mark). They are manufactured in the ISO 9001 quality control system.

Types of the MIDIAS stations

Technological (process) stations may be of two variants: modular, compact.

Modular MIDIAS station

The control microcomputer consist of the processor unit with the possibility of modular extension by I/O units including additional communication channels and the CAN bus.

Compact MIDIAS station

The control microcomputer of the same type is directly a part of the control terminal with an LCD display and a membrane keyboard. From the of the software equipment it is fully compatible with the modular station, but has less inputs and outputs. It serves especially in the applications where an industrial operator’s panel is required.

Possibilities of the MIDIAS system

Control of technological processes
Control of combinational and sequential processes.
Registration of technological quantities and subsequent graphical displaying and backward listing of events in the technology (post mortem).
Registration of transient characteristics at debugging of control circuits.
Automatic registration of the operator’s activity.
Automatic operational diagnostics of the system, connected peripherals and identification of errors.
Check and signalling on working display in coloured graphical environment, on panels and mnemoschemes.
Use of a wide range of sensors, including contactless humidity sensors, heatconsumption meters, capacity and ultrasound level sensors etc.
Use of data concentrators with group converters for resistance thermometer and thermal elements.
Control of electric, hydraulic and pneumatic drives including using of frequency converters of speed of asynchronous motors.
Creation and operative adaptations of regulatory and control algorithms in the technological stations from the operator’s workplace by means of a large library oif functional blocks.
Calculations in dangling decimal point.

Software equipment

The software equipment utilizes the standard WINDOWS programs by Microsoft, a special graphic editor and system equipment MICOS developed for the MIDIAS system. The mentioned software equipment facilitates the user’s works with the MIDIAS system. The user operates the system exclusively by means of menus and no special programming knowledge is required. Changes of algorithms of the system or the structure of control circuits, including constants, can be also done from the operator’s station in any MIDIAS workstation connected to the communication network.

Software equipment of MICOS can be divided into three basic parts:

Communication part

Includes software equipment for communication between operators’ stations and subordinate technological stations. Supported types of communication:

Serial line RS 232 requiring communication port COM1 in PC, enabling connection of one process station with one operator’s station (also via a telephone line).
Industrial network of the RS 485 type supplemented, in case of connection to an operator’s station (PC), by a converter to the Ethernet network. The maximum number of stations is 32 in any combination.
LAN computer network including wireless variant. The number of operators’ stations is determined by the type of the LAN.

Part operated by the technological station

The memory of the technological (subordinate) station contains:

Library of users’ logical or functional blocks, by means of which it is possible to create a user’s program. The orientation to the work with blocks does not require knowledge of a special programming language.
User program – arrangement of blocks, interconnection of their inputs and outputs, selection of constants, periods of calculation etc. is done on the operator’s station by means of the ADR.EXE program. After debugging it is saved in the memory of the subordinate station, where the calculation of blocks creating the required algorithm in the real time is performed autonomously.
This is the way of creation of the basic variant of utilization of the MIDIAS system. This variant is usually supplemented by extra software operated by the operator’s station, which gives the possibility of communication with the user of the MIDIAS system.

Part operated by the operator’s station

Besides the above mentioned program ADR.EXE for creation of user programs of subordinate station, the operator’s station utilizes many other programs. Their purpose is to display the technology states in various ways by means of the user-oriented graphics, or possible various reports for later evaluation. The operator’s station follows individual references in the process stations blocks, which are transferred via the communication network and their values are included in the database of variables. The states of variables can be visually displayed, i.e. projected in mnemoschemes of the technology. The mnemoschemes consist of graphical objects, which enable to display values or change their parameters (colour, height, level, direction, blinking etc.) and thus simply give the operator a view of events in the entire technology. Another possibility is to save the values of variables into various reports (files on disk) for further processing (graphs, record keeping etc.).

The operator’s station may employ the following programs:

GED.EXE – graphical editor with a library of defined objects, which can be easily extended, intended for creation of mnemoschemes.
DBED.EXE – database program for creation of the database of variables, which will pass the values from the subordinate station. In addition there is defined the way of their use under this program (mnemoschemes, emergency report...).
VDL.EXE - program for download which specifies assignment of label values of blocks to the variables in the technological station.
EXE.EXE – the executable program performing visual viewing in the real time according to the requirements specified by means of the above programs.
ADR.EXE – block editor intended for creation and editing of the executive program in the process station.

Basic technical data

Operator’s station

station: PC PENTIUM

printers: according to the customer’s requirement.

operating system: Windows XP by Microsoft.

program equipment: EXE, GED, ADR, DBED, VDL.

Modular technological station

type and design of the station:

Modular station MIDIAS with the processor SAB C167CR-LM with max. 16 extending modules. The modules are in plastic boxes of dimensions 25mm x 104mm x 96mm (w x h x d), which are to be installed directly to the DIN bar, in “sandwich” position to each other.

inputs and outputs: The station enables direct connection of max.:

80 analogue inputs,
64 analogue outputs,
16 fast pulse inputs,
128 logical inputs,
128 logical outputs.
In case of a requirement for more input and output signals the station is equipped with the CAN module; the number of inputs and outputs can be extended virtually without limitation by means of this station.

power supply: 24V DC ±20%.

software equipment: MICOS IV.

Compact technological station