6-9 Advanced Settings (Connection, Communication Cycle Time, Slave Function
Settings, Etc.)
6-9-3 Setting Message Timers
Note
The message timer is used to monitor the time of message communications (explicit
message communications time and FINS message communications time). The
message timer can be set for each destination device independently. If the response of
a destination device is slow, the timer value must be set to a larger value. The
response may be slow for multilevel FINS message communications. The next
message cannot be sent to the same device until the response is returned. The
DeviceNet master monitors the time-out period of the message with this timer. The
CPU Unit, however, is responsible for monitoring the response time with the CMND,
SEND, and RECV instructions. Therefore, it is meaningless if only the timer value or
monitor time is changed for the CMND, SEND, RECV instructions. Set the response
monitor time with the CMND, SEND, and RECV instructions to a value larger than the
timer value. Set both of them to larger values but the value of response monitor time
must be still longer than the timer value if a time-out error occurs frequently.
6-40
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