Issue Summary
On OS versions earlier than V1.4.1, several major issues may occur on the RAC18-IP controller:
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Communication with network points (Local I/O, Modbus, BACnet) is interrupted.
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“Hard fault” messages appear in system logs.
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Unexpected device restarts.
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Problems performing read/write actions on Modbus or BACnet points.
Symptoms
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Loss of data updates from connected devices.
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Frequent controller reboots without warning.
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Error logs showing “hard fault” entries.
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Inability to reliably read or write Modbus/BACnet points.
Root Cause
The installed OS version contains critical errors that affect communication and stability.
When Does This Occur?
This issue typically occurs when:
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Controllers running OS versions earlier than V1.4.1.
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Systems that have not been updated after initial commissioning.
Solution
1. Download the latest version of iC Tool from:
Software - iSMA CONTROLLI Download Center > Software & Tools > iC Tool > Software
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Install the updated iC Tool on your PC.
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Launch iC Tool and connect to the RAC18-IP controller.
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Use Software Manager to upgrade the OS and libraries to the latest version.
Prevention
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Always update the OS and libraries before commissioning or after factory reset.
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Regularly check for updates on the iSMA CONTROLLI support portal.
Product: iSMA CONTROLLI RAC18-IP
Category: Troubleshooting
Related Guides:
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OS Upgrade Procedure
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Library Management
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Communication Setup
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RAC18-IP - OS - Problems with outdated versions | iC Knowledge Base
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