Option 4 requires 3724 Extended Memory (EM) Control Unit variant.
3724 EM variant uses CODESYS target ID 13825 which enables 1088 kB flash memory for PLCopen application.
The target settings for memory layout can be configured in Target Settings dialog's Memory Layout tab in CODESYS.
There are 4 different setting options for Epec 3720/3724 control unit:
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Option 4 requires 3724 Extended Memory (EM) Control Unit variant. 3724 EM variant uses CODESYS target ID 13825 which enables 1088 kB flash memory for PLCopen application. |
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Option |
Flash |
External RAM |
Processor RAM |
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Option 1 (default settings) |
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Option 2 |
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Option 3 |
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Option 4 (default for Extended Memory variant) |
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The number of data segments in Project > Options > Build > Number of data segments must be set to 1 less than the maximum number of global data segments is in Target Settings > Memory Layout > Maximum number of global data segments.
Example: Maximum number of global data segments = 71 (Target Settings > Memory Layout > Maximum number of global data segments) Number of data segments= 70 (Project > Options > Build > Number of data segments) |
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To use CODESYS debug functionality, set the target settings so that PLCopen application is run from RAM. If the application is run from flash, debugging can be done one POU at a time if the POU size is under 4 kBytes (Total size of data memory = 16#11B000).
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Flash: PLCopen application
External RAM: Variables
Processor RAM: %I, %Q and %M areas
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Base |
Automatic |
Size |
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Code |
16#CC0000 |
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16#C0000 |
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Global |
16#400000 |
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16#4000 |
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Memory |
16#E00800 |
X |
16#1B800 |
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Input |
16#E00000 |
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16#400 |
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Output |
16#E00400 |
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16#400 |
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Retain |
16#E00800 |
X |
16#0 |
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Total size of data memory |
16#11C000 |
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Maximum number of POUs |
1200 |
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Maximum number of global data segments |
71 |
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These settings can be used for debugging. PLCopen application stored to flash will not be destroyed. To save the application to flash, use Online > Create boot project.
External RAM: PLCopen application (To save the application to flash, use Online > Create boot project.)
External RAM: Variables
Processor RAM: %I, %Q and %M areas
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Base |
Automatic |
Size |
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Code |
16#400000 |
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16#C0000 |
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Global |
16#4C0000 |
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16#4000 |
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Memory |
16#E00800 |
X |
16#1B800 |
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Input |
16#E00000 |
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16#400 |
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Output |
16#E00400 |
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16#400 |
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Retain |
16#E00800 |
X |
16#0 |
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Total size of data memory |
16#40000 |
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Maximum number of POUs |
1200 |
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Maximum number of global data segments |
16 |
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Flash: PLCopen application
Processor RAM: Variables
Processor RAM: %I, %Q and %M areas
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Base |
Automatic |
Size |
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Code |
16#CC0000 |
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16#C0000 |
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Global |
16#E00000 |
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16#4000 |
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Memory |
16#0 |
X |
16#3000 |
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Input |
16#0 |
X |
16#800 |
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Output |
16#0 |
X |
16#800 |
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Retain |
16#0 |
X |
16#0 |
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Total size of data memory |
16#1C000 |
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Maximum number of POUs |
1200 |
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Maximum number of global data segments |
5 |
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Option 4 requires 3724 Extended Memory (EM) Control Unit variant. 3724 EM variant uses CODESYS target ID 13825 which enables 1088 kB flash memory for PLCopen application. |
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Used automatically by MultiTool Creator when 3724 EM Control Unit project is created. |
Flash: PLCopen application
External RAM: Variables
Processor RAM: %I, %Q and %M areas
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Base |
Automatic |
Size |
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Code |
16#C80000 |
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16#110000 |
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Global |
16#400000 |
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16#4000 |
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Memory |
16#E00800 |
X |
16#1B800 |
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Input |
16#E00000 |
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16#400 |
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Output |
16#E00400 |
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16#400 |
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Retain |
16#E00800 |
X |
16#0 |
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Total size of data memory |
16#11C000 |
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Maximum number of POUs |
1500 |
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Maximum number of global data segments |
71 |
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Source file Topic000707.htm
Last updated 4-Sep-2025