Mitsubishi Electric MELSEC iQ-R Series User Manual page 41

Client function
With the UCMM message communication client function, the buffer memory of the RJ71EIP91 is used to send command
requests to and receive command responses from the EtherNet/IP device.
The client function can be used to access the services of each EtherNet/IP device and thereby read and write items such as
the data and parameters with arbitrary timing.
CPU module
(2)
Device
(2)
Device
(1) Turn on 'EtherNet/IP communication start request' (Y10).
(2) Transfer the stored data with a program.
(3) Turn on 'UCMM data link execution request' (Un\G393216 to Un\G393217).
(4) Command request
(5) Command processing execution
(6) Command response
(7) Turn on 'UCMM data link execution completion' (Un\G393248 to Un\G393249).
UCMM message communications with the client function is performed according to the following procedure.
1.
Starting the UCMM communication execution request ((1) to (3) shown above)
Turn on 'EtherNet/IP communication start request' (Y10) and then turn on 'UCMM data link execution request' (Un\G393216
to Un\G393217) on the RJ71EIP91 on the client side.
2.
Sending the command request ((4) shown above)
When the RJ71EIP91 checks the UCMM data link execution request, 'UCMM data link execution request acceptance'
(Un\G393232 to Un\G393233) is turned on, and then the command request is sent to the EtherNet/IP device.
3.
Command response acceptance ((5) to (6) shown above)
The EtherNet/IP device executes the command processing, and then returns the command response.
When the RJ71EIP91 receives the command response from the EtherNet/IP device, the RJ71EIP91 turns on 'UCMM data link
execution completion' (Un\G393248 to Un\G393249) to complete the processing.
• For the operation timing of EtherNet/IP communications, refer to the following.
Page 137 EtherNet/IP communication start request (Y10)
• For the operation timing of UCMM message communications with the client function, refer to the following.
Page 155 UCMM communication execution command
RJ71EIP91
Client
(1)
(3)
'UCMM data link
request command
(1st)'
(Un\G393280 to
Un\G394047)
(7)
'UCMM data link
receive command
(1st)'
(Un\G394048 to
Un\G394815)
EtherNet/IP device
Server
(4)
(6)
1 FUNCTIONS
1.1 EtherNet/IP Communication Functions
1
(5)
39