Example: Fc3 (Read Holding Register) + Fc4 (Read Input Register); Example: Write Single Coil Fc5 - DEUTSCHMANN AUTOMATION UNIGATE MB EtherCAT Instruction Manual

Deutschmann Automation GmbH & Co. KG
Display of the data in the Modbus Master (FC1):
Example: StartAddress 0008, Length 80, FC2 (Read Input Status)
[01] [02] [00] [07] [00] [50] [c9] [f7]
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UNIGATE sends response via RS232/485:
[01] [02] [0a] [02] [03] [04] [05] [06] [07] [08] [00] [00] [00] [8f] [7a]
8.7.1.2

Example: FC3 (Read Holding Register) + FC4 (Read Input Register)

Fieldbus sends to the UNIGATE
00 30 02 03 04 05 06 07 08 09 0A 0B 0C 0D 0E 0F 10 11 12 13 14 15 16 17 18 19 1A 20 20 20... 
(The configuration is "Data exchange = On Trigger", with an additonal 1. control byte in the field-
bus data.)
„Fieldbus length byte = active", in this example 30h (48d), the UNIGATE
Byte from the fieldbus into the internal storage.
Connected Modbus Master sends request to the RS232/484 side of the UNIGATE
[01] [03] [00] [00] [00] [14] [45] [c5]
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UNIGATE sends response via RS232/485:
[01] [03] [28] [02] [03] [04] [05] [06] [07] [08] [09] [0a] [0b] [0c] [0d] [0e] [0f] [10] [11] [12] [13] [14]...
... [15] [16] [17] [18] [19] [1a] 
Display of the process data in the Modbus Master:
8.7.1.3

Example: Write Single Coil FC5

The Fieldbus Master sent the following data to the UNIGATE
07 01 02 03 04 05 06 07 08 09 0A 0B 0C 0D 0E 0F 10 11 12 13 14 15 16 17 18 19 1A 20 20 20...
17.7.17 UNIGATE
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fieldbus gateway UNIGATE
Implemented protocols in UNIGATE® MB
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copies the following 48
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once:
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MB - EtherCAT V. 1.4
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