HMS Anybus Communicator CAN PROFINET IRT 2.32 User Manual page 12

Description
2.4.3 Protocol Building Blocks
The following building blocks are used in Anybus Configuration Manager to describe the
subnetwork communication.
Group
Transaction
Dynamic Transaction
CAN Frames
Anybus ® Communicator ™ CAN PROFINET
A group does not represent any specific device on the CAN subnetwork, it is only a
means to structure the transactions that have been defined for the gateway in Anybus
Configuration Manager.
Each group can be associated with any number of transactions, however the total
number of transactions in a configuration is limited to 128.
A transaction consists of one or more CAN frames. Each transaction is associated with a
set of parameters controlling how and when to use it on the subnetwork. There are 5
transaction types: produce, consume, query-response, dynamic produce and dynamic
consume. A group can contain transactions of all three types simultaneously.
A total of 128 transactions can be configured.
A dynamic transaction makes it possible for a network master to change selected
parameters during runtime. The parameters are mapped to the Output or General Data
areas and cannot be changed using Anybus Configuration Manager.
A dynamic transaction can only consist of a single CAN frame which in turn can only hold
one data object.
Only one dynamic produce transaction and one dynamic consume transaction can be
configured.
CAN frames are low level entities used to compose transactions. Each frame carries an
11-bit or 29-bit identifier and can hold up to 8 bytes of data.
A total of 256 CAN frames can be configured.
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