8-4
<Toc> <Ind>
<8. Message Communications >
IM 34M6H28-01E
1st Edition : Feb.01,1999-00
8.2
Interface
8.2.1
Request and Response Formats
The request and response formats in the message communication transmit/receive buffer
are as follows:
• Request
Data position no.
Contents
1501
0 (reserved)
1502
Transmission destination node address
1503
0
1504
0
1505
Size of service data (number of bytes)
1506
Service code specified for DeviceNet
1507
Class ID of transmission destination
1508
Instance ID of transmission destination
1509 (up to 1550)
Service data
T080201-1.EPS
• Response message
T080201-2.EPS
Data position no.
Contents
1551
0 (reserved)
1552
Response source node address
1553
Exit code
1554
0 (reserved)
1555
Size of service data (number of bytes)
1556
Service code specified for DeviceNet
1557 (up to 1600)
Service data
• Limit of service data size
•
Service data (for Request) has a maximum of 84 bytes.
•
When service data (for Response Messages) exceeds 88 bytes, code for "abnormal
exit" is stored in the exit code area of the response. In such situations, the first 88
bytes of the service data is kept in the response message.
• High order / low order byte swapping of multiple-byte data in service data
The encoding rules are different for data on FA-M3 and DeviceNet. Hence, in multi-byte
data, it is necessary to swap the byte high order/ low order byte every 2 bytes.
See also Section 7.2, “Module Operation.”
SEE ALSO
For information on the service code, service data, class ID and instance ID, refer to the “DeviceNet
Specification” published by ODVA.
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