WB-MWAC v.2 firmware changelog

Overview

Device firmware can be updated over Modbus; see the instructions.
This page lists changes since the beginning of 2022. Earlier changes are in Firmware Changelog.

Changelog

1.27.0 (30.09.2026) — available in testing

• Added water-flow influence setting for anti-seize protection scheduling.
• Added anti-seize protection statuses indicating postponement reasons.

1.26.2 (21.08.2026)

• LED state synchronized with input level when input mode changes.
• Fixed false front-panel button activation at firmware startup.

1.26.1 (07.08.2026)

• ERRMODBUS012: Fixed possible interruption of Fast Modbus event transmission

1.26.0 (13.07.2026)

• Added service coil register 65500 for LED testing.

1.25.1 (03.07.2026)

• Fixed Modbus issues:
  • Improved Fast Modbus arbitration timing stability.
  • ERRMODBUS008: Unexpected behaviour with long request frames
  • ERRMODBUS009: Unexpected behaviour when reading near address 0xFFFF in continuous-reading mode
  • ERRMODBUS010: Incorrect request validation and handling of invalid requests
  • ERRMODBUS011: Incorrect handling of invalid Fast Modbus event-configuration requests

1.25.0 (08.06.2026)

• Added register for audible leak-alarm duration.

1.24.1 (03.06.2026)

• ERRMODBUS007: Fixed event loss when two devices transmit events simultaneously on the same bus.
• Restored event generation when Reset Leak mode is pressed.
• Fixed false leak actions on a long press in edge-control input mode.

1.24.0 (05.05.2026)

• Added valve anti-seize protection (WB-MWAC v.2 only)
• Added remaining wet-cleaning time register.
• Improved reliability during power loss.
• Optimised filesystem operation.
• Added FlashFS diagnostic service registers.
• Optimized stack usage when requesting many registers.

1.23.0 (22.12.2025)

• Added stack and RAM monitoring service registers
• Added a service register for the last MCU reset cause
• Added a firmware update counter service register
• Added FlashFS diagnostic service registers
• Added device batch-number register (WB-MWAC v.2 only)
• Improved MCU supply voltage measurement accuracy on new devices

1.22.1 (03.10.2025)

• Fixed configuration migration when upgrading to firmware 1.22.0 — ERRMWAC2009

1.22.0 (22.09.2025)

• Added indication when a leak sensor has dried
• Added an audible notification after leaving Leak mode
• Added NO/NC leak-sensor selection
• Added a register to restore default settings

For WB-MWAC v.2:

• Added buzzer control through inputs, a register and Safety Mode

1.21.7 (26.05.2025)

• Removed the ability to enable Leak mode through a Modbus register on WB-MWAC v.2 ERRMWAC2008

1.21.6 (31.03.2025)

• Fixed relay state on first power-on of WB-MWAC v.2 ERRMWAC2007
• Added microcontroller UID Modbus registers for WB-MWAC v.2
• Fixed unexpected behaviour when invalid values are written to some registers ERRMODBUS003
• Fixed loss of Modbus response under very frequent requests (observed on WB-MAP12E)

1.21.5 (13.03.2025)

• Fixed critical firmware and bootloader errors that could prevent startup after power cycling: ERRBOOT004, ERRMWAC2006

1.21.4 (11.11.2024)

• Added parity checking for received Modbus data ERRMODBUS006

1.21.3 (14.08.2024)

For WB-MWAC:

• Removed complementary-mode selection for noncomplementary inputs,
• Turn all relays off on press input mode no longer disables wet-cleaning mode,
• Status LED operation.

For WB-MWAC v.2:

• Fixed inability to set RS-485 parity other than N ERRMWAC2003,
• Fixed incorrect microcontroller temperature and supply-voltage measurements ERRMWAC2004,
• Fixed ability to select nonexistent modes 0–2 in registers 9–14 ERRMWAC2005.

1.21.2 (17.05.2024)

• Added minimum microcontroller-voltage register

For WB-MWAC:

• Restored Alarm output switching in mapping-matrix settings

1.21.1 (03.04.2024)

• Improved wet-cleaning mode visual indication
• Prevented Leak mode activation while Wet cleaning mode is active
• Prevented setting Wet cleaning timer to 0
• Fixed persistence of Wet cleaning timer after restart
• Fixed replies to address 0xFD packets that did not contain Fast Modbus commands ERRMODBUS001

For WB-MWAC:

• Added sensor-state checking when leaving Wet cleaning mode
• Fixed default input-to-output control settings

For WB-MWAC v.2:

• Fixed persistence of Restore valve state after leak is resolved after restart
• Significantly accelerated K1 and K2 button processing
• Fixed counter configuration persistence after restart: Pulse weight P1/P2 and Initial counter value P1/P2
• Added range checking for Pulse weight P1 and P2 registers

1.21.0 (25.01.2024)

Separate firmware branch for WB-MWAC and WB-MWAC v.2.

• Fixed the Repeat after 20 minutes if input is still active function, which did not work
• Leak sensors are now checked at startup. Previously no alarm occurred if the sensor was triggered before the device powered on
• Added Wet cleaning mode to suspend leak-sensor response while cleaning
• Added fail-safe alarm-output behavior settings
• Allowed leak-sensor processing in Safety Mode
• Added configuration-reset register
• Added speaker-disable register
• Added WB-MWAC v.2 support

1.20.4 (07.11.2023)

1.20.3 (11.09.2023)

1.20.1 (24.07.2023)

1.20.0 (11.05.2023)

1.19.2 (05.12.2022)

1.19.1 (16.11.2022)

1.19.0 (11.11.2022)

1.18.5 (01.07.2022)

1.18.4 (30.05.2022)

1.18.2 — 1.18.3

1.18.0 — 1.18.1

1.17.8 (21.04.2022)

1.17.7 (30.03.2022)

1.17.6 (30.03.2022)

1.17.5 (05.03.2022)

1.17.3 — 1.17.4

1.17.2 (31.01.2022)

1.17.1