Example: Fc3 (Read Holding Register) + Fc4 (Read Input Register); Example: Write Single Coil Fc5 - Softing echolink one2PROFINET Instruction Manual

Softing Industrial Automation GmbH
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]
echolink one 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 echolink one
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 echolink one copies the following
48 Byte from the fieldbus into the internal storage.
Connected Modbus Master sends request to the RS232/484 side of the echolink one
[01] [03] [00] [00] [00] [14] [45] [c5]
echolink one 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 echolink one once:
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...
1. Byte = Fieldbus length byte
15.1.15 echolink one2PROFINET V. 1.0
Implemented protocols in echolink one
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