Example: Read Multiple Register Fc3 - DEUTSCHMANN AUTOMATION UNIGATE MB EtherCAT Instruction Manual

Deutschmann Automation GmbH & Co. KG
Here the content of the address 10009 is changed from 0 -> 1
In the following example only the "No. Of Points" is switched to 10.
Which means that now 10 Bits => 2 Byte are read out. This is also the reason why the fieldbus
length byte (2. fieldbus byte) at 0x0A increases by 1 Byte.
8.8.3.3

Example: Read multiple register FC3


RX Poll Delay = 0 is automatically set to 1 by the firmware.
Modbus-Request:
Byte 1 Byte 2
Slave ID Modbus
Function
1 3
The CRC value is automatically calculated by the UNIGATE
®
The UNIGATE
sends out the request (RX Poll Retry = 0) one time via the RS interface, and waits a maxi-
mum of 250 ms (Modbus Timeout = 25) on the response.
Fieldbus Map Adr = 0 -> not activ
17.7.17 UNIGATE
Byte 3 Byte 4
StartAdr StartAdr
High Low
0x00 0x01
®
fieldbus gateway UNIGATE
Implemented protocols in UNIGATE® MB
Byte 5 Byte 6
No. of No. of
Points Points
High Low
0 2
®
®
MB - EtherCAT
Byte 7 Byte 8
CRC High CRC Low
x y
®
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