Accessing the object list

You have the following options for accessing the objects in the object list:

• Access via "acyclical channel"
• Each access to the object list is acknowledged by the function module.
• See chapter "Acyclical channel".

INFORMATION

If you use the acyclical channel to write to objects that are mapped in the I/O area, their values are overwritten with the next cycle. Therefore, data that is mapped in the I/O area should not be written via the acyclical channel!

• Access via I/O area
• The most important objects are mapped in the I/O area and every access to the object directory is acknowledged by the function module.
• The mapping cannot be changed.
• See chapter "Input/output area".