RSTi-OM User Manual
Section 6
GFK-3212A
Jun 2021
IO-Link Master Port Configuration
62
6.4.1
Modbus/TCP Settings Parameters
The following table provides detailed information about the Modbus/TCP Settings page.
Modbus/TCP Settings Page
ISDU Data Settings
ISDU Response Timeout
Default
= 20 seconds
The time that the IO-
Link Master’s Modbus/TCP interface waits for a
response to an ISDU request. The timeout needs to set long enough to
allow all commands within the ISDU request to be processed.
Valid range: 1-10,000 seconds
Process Data Settings
PDI Data Block Size
Default
: 36-bytes
The configurable PDI data block length. Optional lengths are:
4-bytes (header only)
8-bytes (4 bytes data)
16-bytes (12 bytes data)
24-bytes (20 bytes data)
36-bytes (32 bytes data)
PDI Byte-Swap Method
Default
: No byte-swap
If enabled, the IO-Link Master swaps the data bytes in word (2 bytes)
format or dword (4 bytes) format. Options include:
No byte-swap
–
data passed through as received
Word (16-bit) byte-swap
–
data is byte-swapped in word format
Dword (32-bit) byte-swap
–
data is byte-swapped in dword format
Reverse registers
–
data passed through after being reversed
Note: Because both IO-Link and Modbus/TCP use big-endian byte ordering,
byte swapping typically is not required for word and dword data.
Byte swapping is most commonly required when receiving byte (8-bit) data
and it is desired to place the first data byte in the least significant byte
position of the holding register. For these cases, word (16 bit) byte-swap is
typically used.
Include Digital I/O in PDI
Data Block
Default
: False
If enabled, the IO-Link Master includes the current digital I/O pins D1 to
D4 status in the PDI data block header.
False
–
Do not include the digital I/O pins status
True (enable check box)
–
Include the digital I/O pins status in the PDI
data block header
Note: Does not affect the Auxiliary Input.
PDO Data Block Size (From
PLC)
Default
: 32-bytes
The configurable PDO data block length. Optional lengths are Event
code not included:
4-bytes = 2 data words
8-bytes = 4 data words
16-bytes = 8 data words
24-bytes = 12 data words
32-bytes = 16 data words
34-bytes = 16 data words, 1 pad word Event code included:
4-bytes = event code word, 1 data word
8-bytes = event code word, 3 data words
16-bytes = event code word, 7 data words
24-bytes = event code word, 11 data words
32-bytes = event code word, 15 data words
34-bytes = event code word, 16 data words
PDO Byte-Swap Method
Default
: No byte-swap
If enabled, the IO-Link Master swaps the data bytes in word (2 bytes)
format or dword (4 bytes) format. Options include:
No byte-swap
–
data passed through as received
Word (16-bit) byte-swap
–
data is byte-swapped in word format
Dword (32-bit) byte-swap
–
data is byte-swapped in dword format
Reverse registers
–
data passed through after being reversed
Note: Because both IO-Link and Modbus/TCP use big-endian byte ordering,
byte swapping typically is not required for word and dword data.
Byte swapping is most commonly required when sending byte (8-bit) data
to the IO-Link device and it is desired to send the least significant byte of the
holding register first. For these cases, word (16 bit) byte-swap is typically
used.
Append PDO to PDI Data
Default
: False
If selected, the IO-Link Master appends any PDO data to the end of the
PDI data.
False = Do not append PDO data
True (enable check box) = Append PDO data
Clear Event Code in PDO
Block
Default
: False
If enabled, the IO-Link Master expects the first word of the PDO block
to be used for event code handling.
Values are:
True (enable check box) = expect event code
False = no event code, expect only PDO data
