DEUTSCHMANN AUTOMATION UNIGATE MB EtherCAT Instruction Manual page 26

Implemented protocols in UNIGATE® MB
1. Byte = Fieldbus length byte
The following 7 byte are stored in the UNIGATE
With FC1 and the coil length = 80 (10 Bytes) a Modbus Master reads out the following data:
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The fieldbus output data is only updated if it's triggered via a write command from the RS side.
For example via FC 5 :

Address 0002 stays unchanged on 0, however, the fieldbus output data is updated.
After a reset they are NULL (1st row) at first and are then updated (2nd row):
00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ... 

1F 01 02 03 04 05 06 07 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00... 
The 1. byte is the fieldbus length byte. It contains the number of usable characters, followed by
the payload. The user data (internal buffer) is no bigger than1024 byte. 
In the following example the Bit (Coil) in Address 0002 is set to High (1):

The fieldbus data is updated:
1F 03 02 03 04 05 06 07 00 00 00 00 00
26 UNIGATE
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, the rest is not overwritten.
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fieldbus gateway UNIGATE
Deutschmann Automation GmbH & Co. KG
® ®
MB - EtherCAT V. 1.4 17.7.17