Mitsubishi Electric MELSEC iQ-R Series User Manual page 505

■Data Size (Un\G7751708)
The size available for Class3/UCMM communications varies depending on the parameters used.
When performing Class3 communications, settings need to be made in "EtherNet/IP Configuration", including Data Size
(Un\G7751708).
Or, when Path Segment is assigned, this means that the following setting has been done.
• Segment Size (Un\G7751691) is 1: Path Segment assigned.
• The port number for the Path Segment (Un\G7751692 to Un\G7751706) is 1 to 14.
UCMM message communications
When 0001H: UCMM communications is set for the communication method specification (Un\G7751680) and 0001H:
Message communications is set for the communication method specification (Un\G7751681), or when UCMM message
communications are performed, the range of the Data Size (Un\G7751708) that can be requested is as follows.
• Minimum size: 0 (unit: byte)
• Maximum size: 496 - additional header size
*1 When the following parameters are set, 2 (unit: type) is added as an additional header size.
• The Class setting value (Un\G7751710) is 0100H to FFFFH. (When the setting value is 0000H to 00FFH, no additional
header size is required.)
• The instance setting value (Un\G7751711) is 0100H to FFFFH. (When the setting value is 0000H to 00FFH, no additional
header size is required.)
• The attribute setting value (Un\G7751712) is 0100H to FFFFH. (When the setting value is 0000H to 00FFH, no additional
header size is required.)
When the Path Segment is assigned, 14 (unit: type) is added as an additional header size.
Class setting value Instance setting value
00FFH or less 00FFH or less
0100H or more
0100H or more 00FFH or less
0100H or more
*1
(unit: byte)
Attribute setting value
00FFH or less
0100H or more
00FFH or less
0100H or more
00FFH or less
0100H or more
00FFH or less
0100H or more
Presence/absence of Maximum data size
Path Segment
Absent 496
Present 482
Absent 494
Present 480
Absent 494
Present 480
Absent 492
Present 478
Absent 494
Present 480
Absent 492
Present 478
Absent 492
Present 478
Absent 490
Present 476
Appendix 3 Buffer Memory
A
APPX
503