Required transmission time
9-1
9. Required transmission time
9.1 Input
The transmission cycle time requires a minimum amount of time equal to one transmission cycle and a
maximum amount of time equal to two transmission cycles because input area data is not updated on the
master side (double-check) unless the same data is received two consecutive times.
Signals of two cycle times or less may not be captured depending on the timing. Therefore, in order to
ensure a response, provide an input signal longer than two cycle times.
9.2 Output
A transmission time of a minimum of one cycle time and a maximum of two cycle times is required on the
slave unit side, similar to input, because a double-check is performed on that side.
Terminology
Cycle time: Repeated transmission time of actual data transmitted
Maximum transmission delay time: Processing time on master side + Refresh time + Signal delay time
on slave side
Response delay time is as shown in the following diagram.
Change in input data
Change in input data
Input data update
Input data update
1 cycle time
2 cycle times
Case of minimum
transmission cycle
time
Case of maximum
transmission cycle
time
Maximum transmission cycle time
Minimum transmission cycle time
Input and
output device
AnyWire
system
Ethernet system
processing time
Ethernet
system
Input device response time
Slave side signal delay time
Transmission cycle time
Transmission cycle time
Gateway side processing time
Gateway side processing time
Slave side signal delay time
Output device response time
Input
Output
Maximum transmission delay time
Maximum transmission delay time
