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Basic Operation 19
2.3.3 Master Mode
In this mode, the communication is based on a query-response scheme; when the Anybus Communica-
tor issues a query on the subnetwork, the addressed node is expected to issue a response to that query.
Nodes are not permitted to issue responses spontaneously, i.e. without first receiving a query.
There is one exception to this rule; the broadcaster. Most protocols offer some way of broadcasting mes-
sages to all nodes on the network, without expecting them to respond to the broadcasted message. This
is also reflected in the Anybus Communicator, which features a dedicated broadcaster node.
Gateway
Control System
Subnetwork Devices
In Master Mode, Anybus Configuration Manager comes preloaded with most commonly used Modbus
RTU commands, which can conveniently be reached by right-clicking on a node in the Anybus Config-
uration Manager and selecting "Insert New Command". Note however that this does not in any way
prevent other protocols based on the same query-response message-scheme to be implemented.
Anybus Communicator PROFINET User Manual
Doc: HMSI-27-309, Rev. 3.11
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