.

Release Notes: CODESYS Modbus 4.5.0.0

Key Issue Type Summary Resolution Note
MODBUS-277 Bug

Exception with Modbus FB in some special circumstances

Fixed
MODBUS-272 Bug

Status Icon of Modbus TCP Server is not updated, if no request is sent after reconnect

Fixed
MODBUS-267 Bug

ModbusFB library - RTU Master - COM port cannot be opened after a new download

Won't Fix [[GENERAL]]
SysCom issue.
Only appears on secific runtime.
=> Not related to modbus.
MODBUS-261 Improvement

Modbus: Library Properties for Online Help

Fixed
MODBUS-260 Improvement

Add a possibilty to allow Unit ID 0

Won't Fix [[GENERAL]]
0xFF is the correct value for UnitID that a Client shall use (see spec). UnitID = 0 is used for Broadcasts.
A Server (that is not a TCP/Serial) Gateway can accept UnitID = 0. It must accept 0xFF. So your device is faulty.
MODBUS-256 Bug

ModbusFB SysComHandler.SendAsciiFrame calculates incorrect LRC

Fixed
MODBUS-244 Epic

Modbus TCP Master: Support Redundant TCP-Connection

Fixed
MODBUS-239 Epic

Modbus Client: CPU redundancy support

Fixed
MODBUS-237 Improvement

Publish state information from Modbus devices

Fixed
MODBUS-236 Improvement

IoDrvModbus: newer versions require SysTimeRtcGet

Cannot Reproduce [[GENERAL]]
Only very legacy version affected. Newer version don't require the SysTiemRTC lib anymore.
Anyway: this is not a bug. It's an obsoletey requirement.
MODBUS-235 Bug

Modbus TCP Master: cable redundancy: check/align timing when connection is lost

Won't Fix [[GENERAL]]
Obsolete: Behaviour will change due to implementation of "Preferred Line" features for Modbus Redundancy
MODBUS-234 Bug

Modbus Function Blocks library: Server.Start logs wrong supportedFCs

Fixed
MODBUS-233 Bug

Function Block: ModbusServer doku correction

Fixed
MODBUS-230 Bug

Modbus TCP Master: Response Timeout Delayed by 2 Sec

Fixed
MODBUS-226 Bug

Exception in SysComRead Results in CheckRequest

Fixed
MODBUS-222 Improvement

ModbusFB for ModbusTCP should usable if no SysCom is available on the runtime system

Fixed
MODBUS-197 Improvement

Modbus Standalone API: Add license metric attributes

Fixed
MODBUS-189 Improvement

Documentation is missing for MAX_MODBUS_CHANNELS

Fixed
MODBUS-130 Bug

Modbus TCP Slave: With RTE and LwIP stack socket could not be opened after Reset warm or cold

Won't Fix [[GENERAL]]
Must be fixed in the RTE runtime system. Therefore won't fix
MODBUS-53 Improvement

QoS / counter information for each channel

Won't Fix [[GENERAL]] The needed information is already provided by the function block that represents the client.