MTL4841 HART ® Intelligent device MTL

Description

MTL4841 HART ® Intelligent device MTL

MTL4841 HART ® Intelligent device MTL

The MTL4840 HART® connection system provides a simple interface between smart devices in the field and HART® instrument management software run on a PC.

The system is based on 16-channel modularity to provide a compact, easily configurable and expandable system. Using a standard RS485 serial link, up to 7936 individual HART® devices can be connected to a single workstation. For the optimum solution, choose from a range of general purpose and IS termination boards. For maximum flexibility the BPHM64 HART® backplane locates an MTL4841 communications module and up to four MTL4842 interface modules.

General purpose HART® connection units and IS backplanes are also available, each fitted with an interface cable for connection to the BPHM64 HART® backplane. MTL4841 and MTL4842 modules can also be located on HMU16 termination boards for general purpose applications or on BPMH16 / BPMH16U / BPSH16 / BPSH16-32 backplanes for IS isolator requirements.

The DIN-rail mounting HCU16 and HCU16AOHART® connect to 16 general purpose field instruments while maintaining channel to channel isolation. Resistor conditioning options are compatible with all I/O cards. It allows pass-through connections for transmitter power supply, input signal and common. The HCU16AO unit includes HART® filters for I/O cards incompatible with HART® signals.

BPMH16/BPMH16U/BPSH16/BPSH16-32 backplanes with MTL4840 HART® modules fitted, connect either 16 or 32 IS field instruments. Adapter cards are available for the BPMH16U for easy integration to I/O cards and users have a choice of a DIN-rail mounting option. Numerous features may be included in the connection units and backplanes, as required.

Channel to channel isolation; resistors where required for HART® signal conditioning; and HART® filters for analogue systems where the output signal interferes with HART® data or becomes unstable with the presence of the HART® signal. Customised backplanes and connection units are available to provide direct connection from DCS I/O cables, replacing the standard termination board. MTL HART multiplexers are certified by BASEEFA as a safety related sub-system to IEC61508. See the SR Series Interfaces section of this catalogue.

Basic data processing function inspection: Check the authenticity of process parameters, the correctness of process parameter related points, and also check whether the fault diagnosis and error handling of process parameters are timely and accurate, and whether the basic data processing functions of the application software meet the requirements.

Workstation function test: The system configuration, online download, human-machine dialogue, data storage and retrieval, accident recall, and performance calculation functions completed by the workstation are all implemented by application software. In use, in order to ensure complete and reliable functions, it is necessary to confirm these functions possessed by the workstation through testing, The results should comply with the requirements of relevant rules and regulations such as DL/T659-1998 “Online Acceptance Testing Regulations for Distributed Control Systems in Thermal Power Plants”.

(1) Open the system configuration software in the engineer station and create a configuration plan offline according to the configuration manual. If possible, compile and generate it. Check and confirm that the configuration software functions properly.

(2) After the computer control system is powered on and started, the configuration of a main controller or a functional module in the on-site control station is read back to the engineer station through the engineer station configuration tool. Then, this configuration is downloaded to the original main controller or functional module, and then downloaded to the original main control controller or functional module, Check and confirm that there are no errors or crashes in the computer control system during the entire operation process, and ensure that the online download function of the workstation is normal.

(3) Check that the operator station permissions are set correctly and that logging in at the operator level is normal. By using a function keyboard or trackball/mouse, operate each function item by item on the operator station. The connection of each CRT screen should be correct, and the corresponding results of all operations should be correct. This will check and confirm that the basic functions of each operator are complete. For some illegal operations, the software should have fault tolerance.

(4) Check the correctness of the display function.
Check that all main process screens, main parameter monitoring screens, and real-time trend curve display screens, including bar chart, simulation chart, historical curve, trend curve, start stop curve, alarm display, group display, etc., have normal display functions, alarm prompts and associated screens are connected correctly, and alarm confirmation functions are normal. All dynamic parameters and real-time trend curves are automatically refreshed, and the refresh time should meet the requirements.
Check that the display of the historical data retrieval screen is normal. Enter the correct data to be retrieved (such as measurement point name and number) and the retrieval time period. The system should respond correctly and display corresponding historical data reports or curves, historical event reports, operation records, alarm records, etc. If printing is requested, the printed result should be the same as the displayed result.Check that the report management function screen displays correctly, select a report for random (summoning) printing, the system responds correctly, and check that the report content is correct.

Select a flowchart image and trigger the screen copy function. The system responds correctly and checks that the hard copy and image should be consistent. Check the operating status of the system through self diagnostic information, and the display is normal. Check that the help and/or operation guidance screen displays normally. According to the screen inventory, check that there are no missing process screens and parameter monitoring screens.

(5) Report printing and accident recall function test.
By using the function keyboard or trackball/mouse, select all reports in the system on the operator station and trigger the random (summoning) printing function. The system should immediately print the selected report and check that the help and/or operation guidance screens display normally. According to the screen inventory, check that there are no missing images and parameter monitoring images.
After the system is powered on and started, simulate the triggering of switch point actions through event recall. Check that the printing of event recall reports should be normal, and the data and time before and after triggering switch point actions should be correct. Based on the correct response of the SOE, continuously simulate the actions of several switching values, and the SOE should be able to display and print in the correct order.

Verify the resolution of SOE by adding signals with a time difference slightly greater than 1ms to the SOE, which should be able to correctly distinguish each signal and its order, display alarms, and print them.
(6) Historical data storage and retrieval function test. Select a set of recording points from the historical database, which should include analog values, switching values, operation records, system events, etc. Configure historical data reports and curves for the current time period (short-term) separately and display them for printing. The data and time of the reports and curves should be correct, and the entire operation process should have no fault alarms. Configure the data that has been dumped to a tape or optical disc, insert the corresponding tape or optical disc, activate it, and display it for printing. The data and time of the report and curve should be correct, and the entire operation process should have no fault alarms.

(7) Performance calculation function check. Start the performance calculation application and there should be no error alarms. Check that the performance calculation report and screen display should be normal, print the performance calculation report, the content should be normal, and there should be no missing items in the performance calculation items. Check that all measurement points related to performance calculations are normal and the indications are correct. Collaborate with relevant departments and units to check the correctness of various parameters such as boiler heat loss, thermal efficiency calculation, steam turbine heat consumption, generator efficiency calculation, feed water pump efficiency and performance calculation, high and low heater performance calculation, deaerator, condenser performance calculation, etc. Otherwise, adjustments or modifications to the configuration should be made.
(8) The problem of abnormal SOE operation is often caused by inconsistent timing, so it is necessary to check and correct the main clock and GPS standard clock. The maintenance content and requirements for the main clock and GPS standard always device are as follows:
After the power outage of the clock system, first perform cleaning work to ensure that the main clock and GPS standard clock device are free of dust and stains; Then check the correct connection of each channel interface of the main clock to ensure that the communication cable is intact and undamaged; And check that the GPS antenna plug should be reliably and firmly connected without looseness, damage or breakage, installed vertically, and surrounded by no buildings or debris.

After checking that the communication interfaces of the GPS standard clock device are connected correctly and the communication cables are intact, turn on the power and the device undergoes initialization and self check. At this time, there should be no error messages; After initialization and self check, the GPS satellite lock indication should be normal. If GPS is out of step, the internal clock of the device should work normally.
Start the master clock and calibrate it with the standard time. Start the clock of each workstation to correct the time display of each workstation and synchronize it with the main clock or GPS standard clock device.