Acquisition and process control modules Acquisition and process control modules

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Acquisition and process control modules

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Acquisition and process control modules

   Are grouped in more categories:

       Analogical Modules

       Analogical modules are designed for using in data acquisition systems based on PC’s and others microprocessors systems, built with standard serial ports RS-232.

  • Modules with analogical inputs convert input signals in values quantified in standard measurement and send data in ASCII format to host computer, through RS-485 interface. These module measure voltage, currents, temperatures, pressures, etc.
  • The modules with analogical outputs have slew rate define by users. The microprocessor control precise the output rate, updating D/A converter with a frequency of 100 conversion/second, from interval of 10ms. The modules also includes an ADC voltage/frequency converter who is completely independent by D/A converter. This converter ensure a signal of reaction toward microprocessor, so the user may watch permanently the real value of the output signal. So we can see the error situation, like shortcuts or braked connections.

       Analogical modules have no jumpers or micro switches, because the addresses, transfer rate, data format, etc. are software programmable, using simple commands on communication port. All modules with analogical inputs use an microprocessor for controlling an A/D converter 16 bit Sigma-Delta. The sting of galvanic insulation , who is guaranty at 3.000V, protect modules from common mode problems. I/O analogical modules allows conditionating, insulating, A/D or D/A conversion on 16 bit, linearzing and scaling the signal, and also digital transmission. That can be configured for different kind of input sensors and signals. Can be installed each 1, 4 or 16 on a motherboard that allow transmission on serial interface (RS 232 and RS 485). All motherboards ensure make up for could junction for thermo switches.

    Analogical module
    Analogical module
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       Analogical module characteristics

    Analogical inputs:

  • Number of input channels: 8 or 6 differential channels and 2 single-ended channels selectable from jumpers;
  • Resolution: 16 bits;
  • Type of input: V, mV, mA (with extern resistors of 125O);
  • Input voltage: +/-150mV, +/- 500mV , +/-1V, +/-5V, +/-10V and +/- 20mA;
  • Samples rate: 10 samples/second;
  • Bandwidth: 15.7 Hz;
  • Precision: ±0.1%;
  • Offset deviation: ±20 µV/°C;
  • Amplify factor deviation: 25ppm/°C;
  • Isolate loop: 15 VDC la 30 mA ;
  • CMR at 50-60Hz: 86dB minim;
  • NMR at 50-60 Hz: 100dB;
  • Input impedance: 20MO;
  • Overvoltage protection: ±35V;
  • Insulation voltage: 3000VDC;
  • Input voltage: from +10 to +30VDC;
  • Power consumption: 1.3W;

    Analogical output:

  • Photo isolation: 3750 Vrms;
  • Led display: for supply and communications;
  • Numbers of channels: 4;
  • Output types: mA, V
  • Output range: 0 ÷ 20 mA, 4 ÷ 20 mA, 0÷5V, +/-5V, 0÷10V, +/-10V
  • Resolution: 14 bits;
  • Accuracy: ±0.1% from FSR;
  • Resolution: ± 0.02% din FSR;
  • Power consumption: 2.4W;
  • Operate: from -25° to 75°;

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       Digital Inputs / outputs

  • Digital inputs can sense the state of one digital signal situate don a distance (closed switch, activated or not relay).
       The digital inputs of modules have also the latch function. This possibility of blocking inputs values is usefully for some types of photoelectric sensors. The digital modules series offer inputs for measurement time intervals and frequency. The module have 2 counters on 32 bits and a programmable timer for frequency measurement. The counters can be programmed from host computer with starting values or for alarm.
  • The digital outputs are connected with transistors, with collector in empty, who can be remote controlled by host computer. These computers can be used for controlling relays or switches, who also control electric motors, pumps, heating elements, etc.
       Digital I/O boards (DIO) are used in applications that includes notice some switches state (on/off), commutes signals and supply voltage, interfaced with a computer with external equipment.

    Digital Inputs / outputs
    Digital Inputs / outputs
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       Outputs modules with relays

  • This group includes output modules with different types and powers of relays, relays from separate powers, relays with optical isolation, and also drivers for relays, with or without galvanic isolation. Some of these modules have also digital input, insulated or not.
       The modules are designed for mounting on rails DIN from type TS-15, TS-32 or TS-35. To prevent incorrect using, is assured protection on reversing polarity. Each channel state is indicated with the help of an LED. Those modules are available in versions with 4, 8, or 16 channels of relays. For all models, input voltage is 24VCC.

    Outputs modules with relays
    Outputs modules with relays
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       Interface converters

       Interface converters (as modules or boards)transform RS-232 standard signals in insulated RS-232 signals. This conversion interface is necessary to connect a network of process computers, to a PC computer. The RS-485 buss control is transparent for users, while programs for host computer easy to write.
       The main characteristics of converters are:

  • transfer speed through the network is variable, 300 … 9600 … 115K (bps);
  • accept different data formats;
  • automatic regulate transfer rate and data format, without jumpers or micro switches;
  • input: RS-232 protocol;
  • output: RS-232 protocol (on 2 tires, D+ and D-);
  • speed: include “Self Tuner”, automatic commutes transfer rate depending on needs, in range from 300 to 115.200 bps;
  • maximum of 256 modules for one RS-485 network segment, without using repeaters;
  • maximum of 2,048 modules on the whole RS-485 network also using repeaters;
  • isolation voltage 3,000V CC;
  • power consumption: maximum 2.2W.

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       Repeaters

       Repeaters are used to extend maximum communication distance to over 1.2km, in conditions of a high transfer rate (115kbps) or to interconnect more then 256 modules, on RS-485 protocol. Repeaters can be used in shorter industrial networks, to isolate components and to protect against thunder strike or others higher transitory voltage, induced from outside.

       Repeaters:

  • include "Self-tuner" for automatic establish the work speed;
  • accept different transfer speed on network, to de 300 … 9600 … 115K (bps);
  • accept different types of data;
  • automatic regulate transmission speed and data format, without need for jumpers or micro switches;
  • have a insulation voltage: 3,000V CC;
  • consumption: maximum 2.2W.

    Repeaters
    Repeaters
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       MMI devices (Man Machine Interface)

       Boards or MMI modules can be used to integrate interface with user, changing the classical way, with monitor, keyboard and mouse. Modules offer an interactive graphical interface and are designated to work both with PLC’s and PC computers, to implement a human-machine interface with low cost.
       MMI is a compact card, endower with keyboard with 16 buttons (4x4) and an LCD graphic display width 240x64 dots. Have an RS-232 or RS-485 serial interface and 10 insulated digitals inputs. For using on PC based system, the board … RS-232 or RS-485 ports (selectable through jumpers). Through this ports, computer can send commands to change displayed page (witch is stored locally).
       To implement a network of MMI modules, with RS-485 interface, the user need an RS-232 -> RS-485 converter. The PC computer can control up to 256 of MMI interfaces in a single RS-485 network on 2 tires.
       PLC’s users can use digital I/O port to communicate with an MMI card. The PLC send through port I/O page number, so MMI will display the corresponding image, stored in EEPROM. The PLC can send the page number in internal data memory (DM). MMI board check permanently data memory and display the value from internal memory. The value from DM can be combined with image stored in EEPROM. In date memory can be write the input read values from digital inputs or can be introduced from keyboard 4x4, so MMI is adequate also la human-machine interface for PLC’s. The user can edit texts and draw images using advanced utilities available on PC. The resulted hexa file is then transferred in board EEPROM, using a common program.
       The main characteristics of MMI are:

  • EEPROM’s size : 128KB / 256KB / 512KB;
  • control board sizes: 162mm X 70mm;
  • logical digital levels:
    • input voltage for 0 : 0 (min.) ~+1Vcc(max.);
    • input voltage for 1 : +12Vcc (min) ~ +24VVcc(max.);
  • digital impedance inputs :3Kohm;
  • supply: : +10~30Vcc, consumption 1A.

    MMI devices
    MMI devices
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       Boards with counters/ timers

       · Boards with counters/timers can be used in many applications, e.g. counting and summing of some events, position monitoring, impulse generation.

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       Chronological tracking system

       Chronological tracking system of on/off states of main aggregates and break out signals.
    Description:
  • On-line tracking of monitoring digital characteristics;
  • Real time recording, on HDD, of states on/off (in format date, hour, minute, second, … of second) in a text file of circular type of 15,000 lines and in an Excel file (one time a day or by request);
  • Detecting failures and undefined state on/off;
  • Real time recording o non/off states and sending them to a computer defined by a user to be the place in witch the data are saved. The modules receive the commands and return the answer who contain input state (ON/OFF). The data are saved in an circular file of text type and in an Excel file (one time a day, or depending by user inputs data).
  • Saving program. The stable states are displayed and are saved events of type ON/OFF detected on digital inputs of modules that represent various indicators and alarms. On the period that runs, the program saves events records in an text circular file date_temp.txt located in the install directory. Initial these did not contain not any record. Further here will be saved events with additional information, each on a row. From text file on specific time (23:59, with a periodicity of 24 hours) or by request the program allow to generate an Excel file (report) with the records of events, under the following format: on first column will be the event date, hour, minute and second, on the second column the input name, on the third column is the state in witch this inputs pass (ON or OFF). In fact the data from text file are transposed in Excel file, depending on time criteria. For a manual generation of the report, the time range of selected events is between „Begin” and „Finish”, also for automatic generation, the range is from an previous moment with 24 hours until current moment;

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