Mitsubishi Electric MELSEC iQ-R Series User Manual page 506

UCMM tag communications
When 0001H: UCMM communications is set for the communication method specification (Un\G7751680) and 0002H: Tag
communications is set for the communication method specification (Un\G7751681), or when UCMM tag communications are
performed, the range of the Data Size (Un\G7751708) that can be requested is as follows.
Service setting value
124CH
(Class3/UCMM Read Originator)
124DH
(Class3/UCMM Write Originator)
Class3 message communications
When performing Class3 message communications, the range of the Data Size (Un\G7751708) that can be requested is as
*2
follows.
• Minimum size: 0 (unit: byte)
• Maximum size: 1404 (unit: byte)
*2 For connections configured to perform Class3 message communications, the following values are set as the initial values.
• Communication method specification (Un\G7751680) is set to 0002H: Class3 communications.
• Communication method specification (Un\G7751681) is set to 0001H: Message communications.
• For other than the above, the parameters set for "EtherNet/IP Configuration" are set.
Class3 tag communications
When performing Class3 tag communications, the range of the Data Size (Un\G7751708) that can be requested is as
*3
follows.
*3 For connections configured to perform Class3 tag communications, the following values are set as the initial values.
• Communication method specification (Un\G7751680) is set to 0002H: Class3 communications.
• Communication method specification (Un\G7751681) is set to 0002H: Tag communications.
• For other than the above, the parameters set for "EtherNet/IP Configuration" are set.
Service setting value
124CH
(Class3/UCMM Read Originator)
124DH
(Class3/UCMM Write Originator)
■Class3/UCMM communication area (No.2 to No.256) (Un\G7753728 to Un\G8275967)
The No.2 to No.256 information is set and stored in the same order as in the Class3/UCMM communication area (No.1)
(Un\G7751680 to Un\G7753727).
For each buffer memory address, 2048  (No.n - 1) is added to the No.1 address value.
APPX
504
Appendix 3 Buffer Memory
Data Type setting value Presence/absence of
Path Segment

00C3H (INT)
00C4H (DINT)
00C3H (INT) Absent
Present
00C4H (DINT) Absent
Present
Data Type setting value
00C3H (INT)
00C4H (DINT)
00C3H (INT)
00C4H (DINT)
Data Size setting range
1 to 249
1 to 124
1 to (494 - (number of tag name characters / 2 (round
up to the nearest integer)))
1 to (480 - (number of tag name characters / 2 (round
up to the nearest integer)))
1 to (494 - (number of tag name characters / 4 (round
up to the nearest integer)))
1 to (480 - (number of tag name characters / 4 (round
up to the nearest integer)))
Data Size setting range
1 to 248
1 to 124
1 to (492 - (number of tag name characters / 2
(round up to the nearest integer)))
1 to (492 - (number of tag name characters / 4
(round up to the nearest integer)))