Chapter 14  High Speed Counter Module AS02HC 
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  Normal Exchange Area 
The data exchange area between the CPU and a module is in the Device Setting dialog box. The normal exchange areas 
for modules are different from one another. Special D registers  are corresponded to automatically based on the 
configuration data for the convenience of directly reading the values. The error codes of AS02HC-A are configured in the 
Normal Exchange Area. The error codes of the module can be known by monitoring D registers.