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MELSEC-Q
3 SPECIFICATIONS
3.5.2 Communication cycle
The communication cycle is the time interval between the moment a polling or a
bit strobe request is sent to a slave node and the moment another request is sent
to the same node. A different communication cycle can be set for each node by
setting the production inhibit time parameter.
The communication cycle for each slave node can be calculated using the
following expression:
Communication cycle LC = LS + production inhibit time (module: ms)
3.5.3 Transmission delays
(1) Input transmission delay
The input transmission delay can be calculated using the following expressions:
When the reception data is read by the
sequence program
When auto refresh is used
Maximum value LS 2 + Sequence scan time
Normal value LS + Sequence scan time x 0.5
(module: ms)
(2) Output transmission delay
The output transmission delay can be calculated using the following expressions:
When the transmission data is sent by the
sequence program
When auto refresh is used
Maximum value LS 2LS 2 + Sequence scan time
Normal value LS LS + Sequence scan time 0.5
(module: ms)
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