# Automation Professionals' Advanced Modbus Driver **URL:** \ **Category:** 3rd Party Modules\ **Created:** [December 8, 2020, 8:45pm UTC](https://forum.inductiveautomation.com/t/automation-professionals-advanced-modbus-driver/41312 "2020-12-08T20:45:46Z")\ **Posts on this page:** 1\ **Showing post:** 69
**Author:** ![pturmel](https://sea1.discourse-cdn.com/inductiveautomation/user_avatar/forum.inductiveautomation.com/pturmel/32/3295_2.png) [@pturmel](https://forum.inductiveautomation.com/u/pturmel)\ **Post date:** [October 1, 2024, 2:55pm UTC](https://forum.inductiveautomation.com/t/automation-professionals-advanced-modbus-driver/41312/69 "2024-10-01T14:55:37Z")
Automation Professionals is pleased to announce a new production release of the Advanced Modbus Module. For Ignition v8.1.x: ~~v1.1.8.242731956~~ This release fixes a client driver bug in holding register Masked Write operations, as reported by @woodsb02 over here, long ago: > [@Ignition OPC UA Server Redundancy (Modbus TCP)](https://forum.inductiveautomation.com/t/ignition-opc-ua-server-redundancy-modbus-tcp/67123/13): > > Actually, I think I may have found a bug when used with [bit-level addressing and Modbus mask-write](https://docs.inductiveautomation.com/display/DOC81/Modbus+Addressing#ModbusAddressing-Bit-LevelAddressing). Not sure if its new with this redundant BETA version or pre-existing. My test setup (both the modbus server and client are using your advanced modbus driver): Modbus Server listening on 0.0.0.0 Modbus Advanced Client connecting to 127.0.0.1 and 127.0.0.2 Setup a boolean OPC tag which uses the Modbus advanced client device. Using this address works: ns=1;s=[client]1.C1 Using this address work… I couldn't reproduce with the designer tag browser or with fire-and-forget writes, because the actual write worked. The breakthrough came when I scripted my testing with `system.opc.writeValue()`. _Boom!_ This bug goes all the way back to the beta. All users should upgrade. _Sigh._ --- _[View the full topic](https://forum.inductiveautomation.com/t/automation-professionals-advanced-modbus-driver/41312)._