Basic Operation
16
Doc.Id. SCM-1200-093
Anybus Communicator for Modbus Plus
Doc.Rev. 3.01
2.2.2 Data Exchange Example
In the following example, a temperature regulator on the subnetwork exchanges information with a PLC
on the higher level network, via the internal memory buffers in the gateway.
The Temperature Regulator has two
registers, holding the Setpoint Temperature
and the Actual Temperature respectively.
The PLC exchange data between the internal
PLC memory and the slaves (in this case the
gateway) on the Modbus Plus network.
The gatewaycopies the Output Register
of the Temperature Regulator to the
Input Data area.
The gateway copies the Temperature-
Setpoint from the Output Data area to
the Input Register in the Temperature-
Regulator.
The PLC Memory associated with
the gateway is exchanged;
Data from the Input Data area is copied to
PLC Input Memory, and PLC Output
Memory is copied to the Output Data
area.
Input Data
Anybus Communicator Gateway
Serial Device - Temperature Regulator
PLC (Modbus Plus Master)
Output Data
General Data
0x000 0x200
0x1FF 0x3FF
0x400
0x???
Output Register
Input Register
Temperature Setpoint
Temperature Setpoint
Actual Temperature
Actual Temperature
PLC Memory (Inputs)
PLC Memory (Outputs)
Temperature Setpoint
Actual Temperature
(not used in this example)
Modbus Plus
Subnetwork
Summary of Contents for Communicator Modbus plus
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