This parameter is designed to reduce #COMs when using dialup or scheduled devices. The #COM is often a result of how tags are blocked together in the IOServer.
This is the global INI setting. This setting is allowed at a per device level by:
By default, the IOServer only searches for tag data requests to be within or equal to a single cached tag set; for example, cache has tag address points 1 to 10, and then 11 to 20, and a request wants addresses 5 to 6, this is permitted. If, however, the request was for items 9 to 11, the system would not return a match and would request a read from the driver. For a disconnected dialup unit, this would cause a #COM or #WAIT.
CacheOptMode Values are:
For dialup devices, CacheOptMode=1 covers the majority of needs.
0 - No login
1 to 31 - Combination of above values
Default Value: 0