Multiple Port Process Data (Pdi/Pdo) Access Via Modbus/Tcp - Emerson RSTi-OM User Manual

RSTi-OM User Manual
GFK-3212A
11.3 Multiple Port Process Data (PDI/PDO) Access via
Modbus/TCP
The process data have been grouped together to minimize the number of Modbus messages required
to interface to the IO-Link master. The PDI and PDO data for multiple ports can be received or
transmitted by one message.
Starting Modbus Holding Register
Address (base 1)
Starting Modbus Holding Register
Address (base 1)
Starting Modbus Holding Register
Address (base 1)
Starting Modbus Holding Register
Address (base 1)
Starting Modbus Holding Register
Address (base 1)
Starting Modbus Holding Register
Address (base 1)
To receive and transmit process data for eight ports, it may be necessary to adjust the size of the
PDI/PDO data blocks.
Modbus Read/Write Access where:
Modbus/TCP Interface
Read (Input) Process Data Input
IO-Link Port 1 IO-Link Port 2 IO-Link Port 3 IO-Link Port 4 Length
1000
2000
3000
4000
Read (Input) Process Data Output
IO-Link Port 1 IO-Link Port 2 IO-Link Port 3 IO-Link Port 4 Length
1050
2050
3050
4050
Write (Output) Process Data Output
IO-Link Port 1 IO-Link Port 2 IO-Link Port 3 IO-Link Port 4 Length
1050
2050
3050
4050
Read (Input) Process Data Input
IO-Link Port 5 IO-Link Port 6 IO-Link Port 7 IO-Link Port 8 Length
5000
6000
7000
8000
Read (Input) Process Data Output
IO-Link Port 5 IO-Link Port 6 IO-Link Port 7 IO-Link Port 8 Length
5050
6050
7050
8050
Write (Output) Process Data Output
IO-Link Port 5 IO-Link Port 6 IO-Link Port 7 IO-Link Port 8 Length
5050
6050
7050
8050
All PDI data can be read with one Modbus Read Holding Registers message.
•
All PDO data can be read with one Modbus Read Holding Registers read the message.
•
• All PDO data can be written with one Modbus Write Holding Registers message.
Section 11
Jun 2021
Data length = Port 1 to Port 4
Data length = Port 2 to Port 4
Data length = Port 3 to Port 4
Data length = Port 4
Data length = Port 1 to Port 4
Data length = Port 2 to Port 4
Data length = Port 3 to Port 4
Data length = Port 4
Data length = Port 1 to Port 4
Data length = Port 2 to Port 4
Data length = Port 3 to Port 4
Data length = Port 4
Data length = Port 5 to Port 8
Data length = Port 6 to Port 8
Data length = Port 7 to Port 8
Data length = Port 8
Data length = Port 5 to Port 8
Data length = Port 6 to Port 8
Data length = Port 7 to Port 8
Data length = Port 8
Data length = Port 5 to Port 8
Data length = Port 6 to Port 8
Data length = Port 7 to Port 8
Data length = Port 8
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