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6 Message Communications
CJ-series DeviceNet Units Operation Manual for NJ-series CPU Unit(W497)
6-2 Sending Explicit Messages
6
6-2-2 Sending Explicit Messages Using SendCmd Instruction
Precautions for Correct UsePrecautions for Correct Use
The message service function does not guarantee that a given message will reach the remote
node. Messages may be lost during communication due to noise, etc. When the message ser-
vice function is used, normally the node that issues an instruction performs resend to avoid the
above condition. With the SendCmd instruction, the resend process is performed automatically
when the number of resends is specified. For the number of resends, be sure to specify a value
other than 0.
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