Phoenix Contact IOL MA8 PN DI8, User Manual

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IOL MA8 PN DI8
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PHOENIX CONTACT 4022_en_A
Modbus TCP parameters
The following table provides detailed information about the “Modbus TCP Settings” page.
Table 5-6 “Modbus TCP Settings” parameters
Field name Function
ISDU Data Settings
ISDU Response Timeout
Default = 20 seconds
The time that the IOL MA8 PN DI8’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 (To PLC)
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 IOL MA8 PN DI8 swaps the data bytes in word 2-byte format or dword
4-byte 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.
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
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.