Modbus Rtu Master; Functions And Properties For Modbus Rtu Master - Siemens SICAM Q100 System Manual

Communication

2.3 Modbus RTU Master

2.3 Modbus RTU Master
2.3.1

Functions and Properties for Modbus RTU Master

Schematic Overview of the Functioning of the Modbus RTU Master
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Measured values MV x Slv 1 from Modbus slave device 1
Measured values MV x Slv 2 from Modbus slave device 2
...
...
Measured values MV x Slv 8 from Modbus slave device 8
(x = 1 to 15)
Indications Indication y Slv 1 from Modbus slave device 1
Indications Indication y Slv 2 from Modbus slave device 2
...
...
Indications Indication y Slv 8 from Modbus slave device 8
(y = 1 to 6)
Figure 2-8
Supported Modbus Register Sets
• Coil status registers (0x references, read only)
• Input status registers (1x references, read only)
• Input registers (3x references, read only)
• Holding registers (4x references, read only)
86
Device type: SCADA
Device name: SCADA PCx
Ethernet
Modbus TCP
Ethernet
Switch
Device type: SICAM Q100
Device name: Q100_1
Data object image
RS485:
Modbus Master
Modbus RTU
RS485:
Modbus Slave
RS485:
Modbus Slave
Functioning of the Modbus RTU Master
Modbus TCP
Ethernet connection
to further device
combinations of the
same type
SICAM Q100, 7KG95xx, System Manual
E50417-C1040-C522-A8, Edition 09.2020