Rockwell Automation 1336-GM6 Enhanced DeviceNet Communications Module - Manual (Page 81)

Using DeviceNet Explicit Messaging 7-11
• Write access to any register object within the adapter will not be
allowed if the message is passed through a connection whose
expected packet rate (EPR) is zero.
• The adapter is required to mark any explicit connection after
allowing a write to a register object through it.
• If a marked explicit connection times out based on the EPR, then
the I/O fault action will be that configured for Communication
Loss over the I/O connection.
• If a marked explicit connection is deleted, then the I/O fault
action will be that configured for Idle over the I/O connection.
• Multiple explicit connections can write/overwrite the control I/O
if they meet the guidelines specified. Each connection will need
to be marked individually within the adapter.
• If the adapter gets allocated/re-allocated by a controller such that
valid I/O data is being sent to the adapter, or if an Idle condition
from the allocating controller is transitioned back to valid data,
then all marked explicit connections will be reset to unmarked
and future writes blocked.
• If a marked connection has its EPR value reset to zero (0) after
being marked, then the connection will become unmarked.