Protocol „Universal Modbus Rtu Master; Data Structure Fieldbus Side (E.g. Profibus); Data Structure Application Side - DEUTSCHMANN AUTOMATION UNIGATE MB EtherCAT Instruction Manual

Deutschmann Automation GmbH & Co. KG
8.8 Protocol „Universal Modbus RTU Master"
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The UNIGATE is Modbus-Master on the Application side.
8.8.1

Data structure Fieldbus side (e.g. PROFIBUS):

Applies to In and Out
1. Byte: Trigger-Byte, optional (see chapter 8.5, The trigger byte)
2. Byte: Fieldbus length byte, optional (see chapter 8.6, The length byte)
3. Process data
Data structure
8.8.2

Data structure Application side:

According to Modbus RTU Master definition.
Supported functions:
Read coil status FC1
Read input status FC2
Read multiple register FC3
Read input registers FC4
Force single coil FC5
Preset single register FC6
Force multiple coils FC15
Preset multiple register FC16
Note:
status and coil = 1 Bit, register = 16 Bit.
FC 1 + 2 as well as FC 3 + 4 are principally the same, the only difference is the definition of the
start address.
At FC1 it starts at Null, at FC2 at 10 000.
At FC3 it starts at 40 000, at FC4 at 30 000
17.7.17 UNIGATE
(No. of Points = Bit)
(No. of Points = Bit)
(No. of Points = Word)
(No. of Points = Word)
(No. of Points – not used = fix 1 Bit)
(No. of Points – not used = fix 1 Word)
(No. of Points = Bit)
(No. of Points = Word)
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fieldbus gateway UNIGATE
Implemented protocols in UNIGATE® MB
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MB - EtherCAT V. 1.4 29