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4.4 Memory Management
4.4.1 Internal Memory
(1) Overview
Please note that, depending on the firmware and the components used, not the entire memory area is available.
CPU Memory Details
iC9226M-EC
• 2GB working memory (RAM).
• 12MB program memory.
• 32MB data memory.
• 3072kB retentive data memory.
(2) Working Memory
• During operation, the operating system stores temporary data and parts of the user program in the working
memory.
• With MRESET you can set the CPU to the Ready state without a power cycle. This unloads the working mem-
ory, among others. 4.5.1 MRESET on page 68
(3) Parametrization Memory
The parametrization memory as the sum of program and data memory provides memory for:
• Current firmware version
• Overlay file system for user program, configurations, user data and firmware adjustments.
Use of the overlay file system:
• As soon as you configure the CPU or make changes to the current firmware version, data are generated in the
overlay file system.
• By [Resetting to the factory setting type 1], you can delete the overlay file system, among others. The current
firmware version remains, but all changes to it are discarded. 4.5.2 Reset to Factory Settings Type 1 on page
68
• By [Resetting to the factory setting type 2], you can delete the overlay file system and the current firmware
version, among others. The current firmware version is overwritten by the original firmware version and the
delivery state of the CPU is restored. 4.5.3 Reset to factory settings type 2 on page 69
(4) Non-Volatile Memory for Retentive Data
• All data that were marked as retentive in iCube Engineer during configuration are permanently stored here.
• In the event of a power failure, retentive data are automatically backed up.
• By MRESET or resetting to factory setting type 1/2 you can, among others, delete the non-volatile memory for
retentive data.
4.4 Memor
Mana
ement
CAUTION
Damage to the internal parametrization memory due to high write activity!
• Frequent write accesses by applications (for example: data logger applications to the
overlay file system) may cause long term damage to the internal parametrization
memory of the CPU and lead to a device defect.
4
Deployment
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