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System Requirement: Windows 10/11

• Mervis IDE Installer - RELEASE version
  • MervisIDE_2.7.14_(183768)
  • MervisIDE_2.7.6_(180837)
  • MervisIDE_2.6.5_(174306)
  • RELEASE Archive
• Mervis IDE Installer - BETA version
  • To try out the latest features — with the risk of potential bugs — you can also test the BETA version
  • MervisIDE_2.7.20_(188652)_JSV_BETA
  • BETA Archive
• .Net Server for PLC
  • .Net Server for Mervis RT
  • Installation / Update instructions for .Net Server for Mervis RT
  • Watt Price driver (.Net)

• Lib.Mervis – added SpikeFilter block
• Lib.Mervis.Alarms – new version of the ResetBlockWithAck block with Ack and Reset outputs
• Lib.Mervis.Energy – added preview version of the EMax block
• Fixed generation of WAGO KBUS terminal configuration
• Fixed history storage in DB when the server returns an error response
• Added support for M2/M5/M6 platforms for Unipi Edge E410/E411/E412/E413
• Fixed slow device polling using the IEC62056‑21 protocol
• Fixed loading of solutions with an invalid Modbus timeout
• Updated identifier validation – identifiers must not start with a digit
• Autogen dialog – added option to skip mapped data points
• ST Editor – added warning when referencing a program or function without a call operator
• FBD Editor – diagram resizing now snaps to the grid and respects element positions; a protective zone around elements is preserved
• FBD Editor – new appearance of resize handles for diagrams and ladders
• FBD Editor – fixed port ordering after renaming an FB port; port placement now follows the ST declaration
• FBD Editor – fixed cursor icon flickering when dragging with the mouse
• FBD Editor – fixed occasional incorrect placement of a variable in the ladder when inserting it
• HMI Editor – Text gadget – added support for multi-line text; editing in a separate dialog; the Property Grid shows the first line of text
• TextMenu – fixed export of the AlarmPointStatus gadget; it now exports state definitions
• Variable Browser – added sorting and filtering options for the Value column, including :any, :anyvalue, :no, :novalue
• Mouse wheel scrolling respects Windows system settings; Shift + wheel scrolls horizontally across the entire IDE
• Fixed reported IDE crashes

• [SECURITY] Updated MbedTLS encryption library to version 4.1.1
• [SECURITY] Added support for secure login in the SSCP protocol
• Fixed access to array elements of BACnet variables
• Improved memory management when loading an image into the PLC – previously could cause insufficient memory during loading
• Added automatic driver update in the .NET server upon RT update
• FBD Editor – added Junction Point for branching wires in the diagram, added support for vertical wires (FBD Editor Appearance and Layout)
• FBD Editor – added ability to resize the left and right ladder via handles at the diagram edge
• FBD Editor – added horizontal scrolling of the diagram using the mouse wheel with Shift
• FBD Editor – fixed variable insertion into the ladder – the variable is now always placed into the ladder it was dropped on
• FBD Editor – fixed inactive Zoom +/- buttons in debug mode
• FBD Editor – fixed context menu display (now opens at the cursor position and matches the element under the cursor)
• FBD Editor – fixed size of hit zones (ports, wires) when zoom level changes
• FBD Editor – fixed wire dragging at different zoom levels (handles now scale with zoom)
• FBD Editor – fixed IDE crash when a file was dragged over the editor (Drag & Drop)
• FBD Editor – color-coded wires (bool – blue, analog – green, pointer – brown)
• FBD Editor – in debug mode, boolean value is now indicated by wire thickness (true – thick, false – thin)
• FBD Editor – disabled Write On Change flag for IN_OUT variables
• FBD Editor – added read-only Namespace property for global variables in the Property Grid
• HMI Editor – added Zoom 1:1 option to reset to default scale in both HMI and FBD editors
• HMI Editor – Link gadget - added ability to manually enter Page ID (guid) of target page (Link Action: “Page Custom”)
• ST Editor – added a warning comment to generated code (Globals/generated.st) for users
• ST Editor – fixed an issue where, e.g. after creating a global variable, blank lines in .st files were being stripped
• Variable Browser – fixed IDE slowdown after Excel export of variables (memory leak, optimizations for large variable counts)
• Variable Browser – added Excel export/import (SCADA) State Mapping for TPG variables
• Variable Browser – added Excel export/import (SCADA) Increment/Decrement
• DataGrid Settings dialog – added sorting and filtering of the column list, added an Order column
• Document tab context menu – added Close All and Close Others options
• WattPrice – updated OTE SOAP API (new as of 4/2026), added ENTSOE-E support, OTE-CZ 1_1 marked as obsolete
• WebPanel – fixed downloading of the alarm log
• Updated AvalonDock library (switched to the Dirkster.AvalonDock NuGet package (4.74.1))
• Updated third-party libraries to current versions – YamlDotNet (18.1.0), SciChart (9.1.0.29201), AvalonEdit (6.3.1.120), DocumentFormat.OpenXml (3.5.1)
• Fixed reported IDE crashes

• RT – Fixed communication interruptions when using Proxy
• Adjustment in ordering of open documents (the tab of a newly opened document is placed in the first position after Tool windows – System Status, Variable Browser, etc.)
• HMI Editor – Chart Gadget: added Bar chart option for SCADA export
• HMI Editor – color palette expanded with 60% / 70% / 80% / 90% Transparent White
• Property Grid – adjusted popup error/warning window display so it is no longer clipped
• FbdEditor – Variable creation dialog: added version display for the selected Type
• System log is now exported in Excel format
• Fixes for reported occasional crashes, increased stability of the development environment

• [SECURITY] Updated MbedTLS encryption library to version 4.1.0 – added TLS 1.3 support, fixed issues caused by the transition
• Added support for Edge platforms with MBUS interface and Patron M537
• Fixed segmentation fault in the BACnet server
• Adjusted dialog for downloading the system log
• Improved port monitor for the MODBUS client
• Fixed timeout handling in the MODBUS client
• Added support for entering element addresses in hexadecimal format for MODBUS “Import device definition” – addresses are now prefixed with 0x…
• Fixes in the HTTP 1.1 client (proxy server connection, data storage into MervisDB)
• Fixed network mask configuration on Wago PLC 750‑81xx
• Fixed firewall configuration on Wago PLC 750‑81xx
• Fixed automatically added prototypes for 64‑bit Unipi platforms
• HMI Editor – increased gadget limit per page for Terminal H‑L100 from 100 to 500
• DPTable Editor – Import SCADA Variables dialog: added selection of source devices
• DPTable Editor – added function to remove empty groups and function Update from SCADA Variable
• Variable Browser – SCADA Variable: User Friendly Name now supports placeholders {DEVICE_NAME}, {VARIABLE_NAME}
• FBD Editor – fixed an issue that caused lines in the diagram to be deleted when opening/closing a project
• FBD Editor – fixed Replace All behavior where the displayed name changed but the variable remained the same
• Find Result – fixed crash when clicking on a target that had been removed in the meantime
• Adjusted Toggle button display style (e.g., in the Results window)
• IDE now ignores the Windows TextSize Scaling feature; DPI changes are handled appropriately
• Stability improvements and fixes for random crashes reported by users
• Microsoft Visual C++ Redistributable libraries are now included in the installer
• The installer now checks and, if needed, provides instructions for updating Microsoft .NET Runtime

• [SECURITY] Updated MbedTLS encryption library to version 4.1.0, Support for TLS 1.3
• Added support for Wago 751‑9401 and 751‑9402
• RT – Fixed write operations when using fixed CommUID
• Fixed unintended use of secondary addressing in MBUS
• Fixed IEC60870‑5‑104 protocol handling in Wago PLC CC100
• The name of a blocked device on the client channel is no longer used in identification within port monitor logs
• Added validation of matching project and PLC names during compilation (previously checked only when opening the solution)
• SCADA export – fixed exception caused by missing assignment of a graphical schema to a terminal
• Updated SharpVectors library to version 1.8.5
• Adjusted processing of .svg images for further use in the IDE
• HMI Editor – fixed display of pop‑up gadgets when part of a group (previously displayed at the group’s creation point)
• Fixed long build times when using fixed CommUID / HistoryID

• SCADA Export – tightened condition for matching DigitalInput data points (State Mappings must be identical)
• SCADA Export – option to configure CommError insensitivity (Communication Error Delay in SCADA Terminal Parameters)
• Variable Browser – added option for Excel export/import of the SCADA Alarm Delay parameter
• FBD Editor – minor adjustments to improve stability
• Information about updating Mervis RT on the UniPi platform (https://kb.mervis.info/doku.php/en:mervis-ide:40-mervis-rt:90-unipi:40-rtupdateinfo)

• Modbus device CSV import – added an error message when the element value is 0
• Solution Explorer – removed the “HMI Library Projects” folder; HMI projects are now placed in the “HMI Projects” folder
• .ssn saving fix – elements in GroupsParameters were being saved twice
• FBD Editor – added a Property Grid item showing the Type of the selected function block
• Excel export from Variable Browser – added the Type column
• PropertyGrid – tooltip is now displayed across the entire property row

• Added MQTT client driver
• Fixed reading and sending messages via GSM modem
• Adjusted variable mapping – only the mapping direction can be edited based on the group type
• Added the TimeElapsedSincePeriodStart function to the Lib.Mervis library to determine elapsed time from a defined base point
• Extended the IndividualRoomController v2.0 block with inputs for humidity and CO₂ level
• Added an error message for invalid function assignment for a group in the Modbus client channel
• Fixed validation of variable names in function blocks in FBD
• Fixed renaming of system files in the solution (e.g., generated.st)
• Added the “SCADA FHD 16:9 (1828×842)” graphic template resolution to the HMI Graphic Editor
• Fixed IDE crash when deleting a FUPLA block that was added and expanded in Watch
• Updated SCADA Editor – added optional *.data file extension during export
• Updated timeout handling in the Watt Price driver – 5–10 s when connection cannot be established, 5–10 min when invalid data is received; added validation of received data
  • .Net Server update required on PLC (https://kb.mervis.info/doku.php/en:mervis-ide:20-download:00-start#download)

• Fixed error reporting in FBD – data type names were not displayed in case of incompatible connections
• Fixed the argument generation order for generic functions (gt, lt, add, …), which could lead to incorrect evaluation
• Fixed segmentation in the BACNet server for the last segment – this could cause communication failures
• Added indication of the PLC state “exception” in the Solution Explorer
• Fixed writing of the variable collection for certain types of changes in the variable structure

• Fixed a crash in the support application for the web panel
• Improved port error reporting in the port monitor
• Extended the Mervis color palette with new colors for the Day, Night1, and Night2 modes

• Added GSM modem reinitialization in case of timeout
• Fixed issues in MBUS communication
• Fixed inability to read extended values from the Inepro380 electricity meter (MBUS)
• Fixed device reading using the IEC62056-21 protocol
• Fixed metadata generation for the exported image (export directory)
• Fixed loading of image files for data sources in case of corrupted metadata
• Enabled decoding of split packets in the port monitor (MBUS)
• Fixed scheduler mapping in the BACNet server
• Added support for Mikroklima Terminals platforms (ESG.SharkPLC.IDE.Platforms.MK.Terminals, e.g., H‑L100)
• Extended functionality of the page ordering dialog within the Graphic Template (Add / Remove / Rename / Page Selection)

• Fixed CEZd delta criteria for IEC 60870-104
• Added block for Tracking PI with four inputs
• Fixed initialization of cascade controller 3.2 at first start when parameter definition was incorrect
• SCADA Export – fix for incorrectly evaluated HistoryId
• HMI Graphic Editor – added dialog for page ordering within the Graphic template

• FBD Editor – Fixed the order of functional block input assignments and their execution
• DPTable Editor - Added Time Zones support

• Time Program Editor – fixed crash when editing State Descriptions
• SCADA Editor – added support for Subrange data type variable
• Task Mapping Dialog – fixed column widths, Name column is now user-resizable
• Fixed MessageBox colors in Dark Theme

• FBD Editor – fix, restored display of InOut port settings
• Chart – added option to export data from chart to .xlsx format
• .Net WattPrice driver – migration to official OTE-CR SOAP API
  • Project update required (Price API Type: SOAP, Price API URI: http://www.ote-cr.cz/services/PublicDataService)
  • .Net Server update required on PLC (https://kb.mervis.info/doku.php/en:mervis-ide:20-download:00-start#download)
• Configuration – fixed setting of Default Gateway Configuration and Gateway parameters

• Result Tool Window – Added icons to filter buttons
• SCADA Export – Fixed export of Real Scheduler, added support for Min/Max/Step parameters
• Fixed import of Modbus variables from CSV file
• Fixed error message during terminal compilation when PLCs are not yet compiled
• Enabled button width adjustment in Analog Setter
• Fixed maximum height of the dialog for creating a new gadget style
• RT – Updated MbedTLS library to version 2.28.10

• Enabled selection of network interface from a list in the device definition for the SSCP client
• Added prototype for Modbus electricity meter DAC4300

• FBD Editor – Adjusted behavior when adding and removing dynamic ports – layout of IN/OUT inputs/outputs of array type
• Fixed the number of elements in the communication group during Modbus device import
• Fixed generation of fixed HistoryID and their usage in SCADA exports
• SCADA export – warning if Controller Connection Status has an assigned PLC History Profile
• SCADA export – warning if Controller Connection Status does not have an assigned history profile
• HMI Graphic Editor – fixed positioning during export of PopupGadgetView and DigitalSetterComboGadgetView gadgets

• Fixed uploading of variable collections containing an alarm point
• Added support for synchronous history in the HistoryStorage.SaveValue function
• Fixed IRC – blocking based on outdoor temperature

• IEC60870-104 – Fixed grouping of information objects in interrogation
• Fixed reading of consumption profiles from AmmShop DAC electricity meters in case of shifted time on the meter
• SCADA Editor – Fixed pairing (table – schema) of data points generated from a DataSource variable
• SCADA Editor – Added automatic name generation for data points created from schema
• IEC 60870 HwEditor – Fixed sorting by the Identification Object Type column
• Graphic Template Editor – Warning instead of Error for invalid variable type connected to gadget
• FBD Editor – Fix – Restored removed functions “Remove Definition”, “Change Definition”

• Fixed system configuration for Wago CC100
• Wago CC100 is now subject to licensing
• Added library Lib.Mervis.IRC
• Fixed time processing when reading consumption profiles from Ammshop DAC electricity meters
• Added keyword validation when creating global variables
• Enhanced global search function (CTRL+SHIFT+F) – enabled navigation from search results to Modbus Server Editor
• Port Monitor – Fixed behavior where messages stopped displaying after switching between multiple PLCs
• FBD Editor – Adjusted behavior when adding/removing dynamic ports (e.g. blocks AND, MUX…)
• SCADA Terminal – Fixed non-functional reset of assigned Data Template / Schema on the Controller
• SCADA Editor – Fixed display of variable names from Data Source that were incorrectly shown with a trailing dot
• FBD Editor – Fixed an error in creating global variable in nested namespaces
• SCADA Editor – Fixed generation of data point names from the name of the assigned variable from Data Source

• Fixed the number of Modbus telegram retries on the serial line
• Improved handling of error states in Modbus RTU
• Fixed integration mode for client serial channels

• Added support for Wago CC100 PLC – network configuration, RT update, I/O, automatic addition of I/O prototype
• Fixed uploading of variable collection
• Fixed duplication of records in port monitor
• Added support for Unipi Edge platform
• Changed serial number display format for Edge
• Added support for reading consumption profiles from Ammshop DAC electricity meters
• Fixed exception during sorting in data grid while in edit mode
• Improved global search function (CTRL+SHIFT+F) – added search in Modbus server editor, refined identification of found items

• Fixed hardware prototype for Midam B-MIDI module
• Fixed configuration of Midam modules – configuration was lost after restart
• Fixed PIN code setup for GSM devices
• Adjusted autogen for attributes ForceComm, CommunicationBlock, and PriorityRefresh for projects from older IDE versions
• Added hardware prototype for Brötje ISR Modem Modbus
• Fixed failure during RT update on Wago PLC

• Variable Browser / Property Grid – Fixed exception “Object reference not set to an instance of an object” in method IsBacnetVisible()
• Watch – Fixed - IDE freeze in debug mode when switching variable to manual mode

• HW Modbus Editor – Fixed: Autogen did not generate variables for Group_identification and Group_statusbyte. Additionaly it was not possible to assign any other variables manually.
• SSCP Client – Fixed behavior when multiple devices with different proxy IDs were defined
• RT – Fixed crash when a retain variable switched to manual mode was deleted
• Amit DB Net Driver – Fixed freeze when stopping RT

• FBD Editor – Fixed a crash when renaming the input variable of an edited function block
• ST Text Editor – Fixed a crash when closing the editor during debugging
• PLC / Terminal – The displayed assigned device template now shows the full path
• Solution Explorer – HMI Project – Fixed item sorting; folders now have higher priority than individual items
• HW Configuration – Added validation for correct database access parameters
• RT – Fixed a crash when username or password for the database was not provided
• Terminal Deploy – Now uses the defined fixed CommUID if specified for the variable
• Modbus Client – Added function to read a file

• ST Text Editor – Added support for toggling text overwrite mode via the INSERT key
• ST Text Editor - Fixed crash when adding a breakpoint in ST code with multiple new controllers, one lacking an assigned program
• Property Grid – Fixed the Reset [R] button to correctly unset assigned DataPoint Template and Schema
• Watch – Resolved a bug that caused an exception when more than one item was deleted
• RT – Fixed the launch of communication functions – now synchronized with the computation cycle
• Modbus Server – Fixed error reporting for overlapping registers

• HMI Graphic Editor, Template gadget, template selection – fixed sorting of available templates
• Reading consumption profiles from MBUS electricity meters EMU Professional II LP
• Added native function to allow saving a variable to history from ST code
• Minor adjustments to the ST code hinting tool for block expressions (VAR, NAMESPACE, …)
• Fixed reading of value in Modbus server
• Fixed indication of manual mode for a variable
• Fixed display of non-existent variable in mapping editor
• Fixed expansion of variables in variable browser
• Fixed IDE freeze when attempting to stop PLC during active debugging mode
• Fixed RT update on Wago PLC when upgrading from version 2.5
• Expanded library compatibility checks
• Fixed crash when attempting to send email
• Fixed linear conversion in Modbus CSV import
• Fixed variable selection in SSCP client channel
• Extended capability to read duplicate DIF/VIF in MBUS client channel
• Fixed termination of connection in CloudAccess client
• Added functions for time conversion between Unix32 epoch time and data type DT

• Fixed an issue that caused a .NET exception in the Output window: Could not load file or assembly 'System.Text.Encoding.CodePages'
• SCADA Export – fixed the 'DateTimeKind' setting for exported data points ('UTC for PLC RTC', 'Local for other variables)
• Variable Browser, Excel Import – fixed import of empty cells (previous behavior skipped setting the property value, now it is set to 'null')

• Added validation to prevent leading and trailing whitespace characters in username and password textboxes
• SCADA Export - Resolved an issue where the +/-/INIT action property buttons did not adhere to the defined min-max value range
• Port Monitor - Fixed a bug where changes in the Controller selector unintentionally modified the selection in the Debug controller selector
• History Profile Dialog - The label “Min. Save Period” has been renamed to the more descriptive “Debounce Interval” with a tooltip “Prevents saving data too frequently”

• Dialog Open Solution – Fixed a crash occurring when selecting “Open in current instance” and then pressing the Cancel button
• Fixed the duration of the splash screen display at application startup
• SCADA DP Table Editor – Fixed a crash occurring when creating two or more groups with the same name at the same level and then importing data points

• Property Grid – Fixed behavior of the input/output editor
• FBD Editor – Added existing variable; unified behavior when invoked from the context menu and keyboard shortcut Ctrl+Shift+E
• Optimization – Improved loading and building of projects
• Resizable Dialogs – Added the ability to resize selected dialog windows
• Multi-Monitor Setup – Adjusted behavior for setups with different DPI settings
• IDE Crash Fixes – Resolved crashes triggered by Ctrl+F in the ST editor
• Solution Explorer Stability – Fixed crashes occurring when clicking inside Solution Explorer immediately after project build
• Modbus Server Editor – Added export/import for the Note field
• Breakpoints in ST Editor – Fixed behavior issues
• Function Block Naming Issue – Fixed exceptions occurring when trying to open renamed copied function blocks in Solution Explorer
• History Log Stability – Resolved crash when deleting the History Log
• HMI Enhancements – Added support for the ST Subrange data type
• Watch Variables Fixes – Adjusted behavior for structured-type variables
• FBD Editor Stability – Fixed crash when using Remove Definition for multiple selected variables
• Watch Enhancements – Retaining previously added variables after project reopening
• Note Resizing in FBD Editor – Fixed issue preventing resizing of notes
• SCADA DP Table Editor – Added an option to create a data point indicating loss of communication with the PLC
• Graphic Template Editor – Fixed an issue where Chart gadgets copied from WebPanel Template to Scada Template caused variable disconnection
• Language Translations – Corrected some translations
• Watch Enhancements – Enabled adding variables from Server Editor (e.g., Modbus Server)
• SoftPLC Link Improvements – Allowed manual entry of the name, type, and GUID of a communicated data point
• Data Source Enhancements – Added an option to define a relative path to *.exs files
• Debugging Improvements – Displayed Configuration Properties even during debugging
• Variable Browser Enhancements – Added columns with Actual Value to .xlsx exports
• New Prototypes Added – Supplemented new prototypes for Extension xS52, xS53, and xS54

• Fixed duplication of attributes in communication groups
• RT: Fixed closing of TCP communication channels, preventing their exhaustion and communication failure
• Fixed frame numbering, change detection, and memory issues in the IEC60870 protocol; added a library of supporting function blocks
• Fixed error reporting for non-existent mapped variables in server channels
• Adjusted simultaneous display of communication errors and manual mode
• Fixed default settings for link communication parameters
• Project type change is now only possible one-way (from executable to library)
• Modified error reporting during RT updates
• Updated configuration for Unipi Technology modules
• Fixed factory reset configuration for Unipi Technology PLCs
• Optimized web panel file uploads
• Increased allocated memory size for variable backup to FLASH
• Extended port monitor outputs for Amit protocol
• Added font size adjustment in the text editor using Ctrl + mouse wheel
• Fixed quick response detection in the IEC 62056-21 protocol
• Fixed serial port usage in I/O functions from ST
• Fixed alarm list generation for PLCs
• Fixed RFC2217 driver hang-up
• Fixed NextOutput behavior in the T19 Int Scheduler block when transitioning from Sunday to Monday
• Resolved TCP communication freezing due to network issues
• Fixed long wait times during ST code debugging
• Corrected timeout settings for TCP and UDP communications
• Added Cloud Access connection type for PLCs in IDE
• Fixed SunShine output in the T40 Solar Calculator block
• Modified autogen behavior for variable generation and mapping
• Added highlighted word selection in the ST editor
• Fixed Cloud Access client configuration generation on PLCs
• Enabled subrange data types in historical profile definitions
• Added the atan2 function