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5 Noncyclical data exchange
Declaration of a data structure in the "Multi-ID" format
In the IO controller, you need to declare 1 data structure each (user-defined "STRUCT variable") for in-
coming and outgoing data exchange packets as the target and source memory for incoming/outgoing
data exchange packets. Data exchange packets in the "Multi-ID" format have a fixed length of 65 bytes
and must be created with the following structure:
Structure variable for data exchange packets in the "Multi-ID" format
Data type Name Explanation
BYTE ID-PLC Sequential numbering for assigning the data exchange packets
from queries and responses
The "ID-PLC" value must be used by the IO controller for se-
quentially numbering the outgoing data exchange packets.
JUMO IO devices enter the same number in the ID-PLC in the
data exchange packet of the ensuing response, so that re-
sponse and query can be assigned at the IO controller, or so
that an error in the sequence of query and response can be in-
tercepted by suitable control structures in the IO controller.
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