Considerations When Connecting E71 - Mitsubishi Electric MELSEC IQ-R series Reference Manual

Programmable controller
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Considerations when connecting E71

Send of request message
Before sending a request message, check that the supported device is ready to receive the request message.
When sending multiple request messages
For 4E frame, send the request message with appending "Serial No." to the subheader on the external device. By appending
"Serial No.", the send source can be identified when multiple request messages have been sent.
When sending request message continuously
When sending request messages consecutively without waiting for the reception of the response message using 4E frame,
make sure that the number of command messages shown below are not exceeded.
Name
Ethernet interface module
CPU module
*1 If the calculation result became decimal, the number after the decimal points will be rounded off to positive number.
When exceeded number of commands were sent, an error may occur in the supported device, or response messages may
not be returned from the supported device.
When sending the request message which exceeds the number of commands, decrease the frequency of request message
transmission.
When the response message corresponding to the request message does not return
If the response message is not returned from the supported device, resend the request message from the external device
after the specified time set with "Monitoring timer" of the request message is elapsed.
Replacement of devices
After replacing a device on Ethernet due to failure, the devices may not communicate properly because of the change of the
MAC address. (When replaced with the device that has the same IP address)
When a device in the Ethernet network is replaced, restart all devices in the network.
3 COMMUNICATION PROCEDURE
26
3.2 Considerations
Model name
Applicable number of commands for processing per one connection
1 + (57  Number of connections to be used)
QJ71E71-100,
LJ71E71-100
1 + (10  Number of connections to be used)
QJ71E71-B2,
QJ71E71-B5
1 + (Number of messages that can be stored in receive buffer (576)  Number of connections to be used)
Q03UDVCPU,
Q04UDVCPU,
Q06UDVCPU,
Q13UDVCPU,
Q26UDVCPU
*1

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