Rockwell Automation Publication 1756-PM020F-EN-P - January 2019 91
Request Format: [byte size][file number][file type][element number][sub-element number]
• [byte size] 1 byte, number of data bytes to be read
• [file number]1 byte for 0-254; for >=255, 3 bytes, 0xFF followed by 2-byte number, low byte first
• [file type] 1 byte. For file types and codes, see the DF1 Protocol and Command Set Reference Manual
, publication
1770-6.5.16.
Refer to SLC Communication Command.
• [element number] 1 byte, 0-254; 3 bytes for >=255, first byte=0xFF then 2-byte number, low byte first
• [sub-element number] 1 byte, 0-254; 3 bytes for >=255, first byte=0xFF then 2-byte number, low byte first
Reply Format: [data]
[data]
See also
SLC Communication Commands on page 90
PCCC Commands on page 81
This service is supported for compatibility with older modules. It writes to
the logical address.
Request Format: [byte size][file number][file type][element number][sub-element number]
[byte size] 1 byte, number of data bytes to be written
• [file number]1 byte for 0-254; for >=255, 3 bytes, 0xFF followed by 2-byte number, low byte first
• [file type] 1 byte. For file types and codes, see the DF1 Protocol and Command Set Reference Manual
, publication
1770-6.5.16.
Refer to SLC Communication Command.
• [element number] 1 byte, 0-254; 3 bytes for >=255, first byte=0xFF then 2-byte number, low byte first
• [sub-element number] 1 byte, 0-254; 3 bytes for >=255, first byte=0xFF then 2-byte number, low byte first
Reply Format:
no data-only access
See also
SLC Communication Commands on page 90
PCCC Commands on page 81
This read command provides a simpler version for reading data.
SLC Protected Typed Logical
Write with 3 Address
Fields(CMD=0F, 4F, FNC=AA)
SLC Protected Typed Logical
Read with 2 Address Fields
(CMD=0F, 4F; FNC=A1)
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