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Lead Contents

PLC: Data Heading Not Received Properly

FAQ No. FAQ01830

Primary Contents

Question

When I send and receive data with protocol macros, occasionally the data header is not received properly. Why?

Answer

If the device that you are connected to using protocol macros has a fast processing time (the time the data is received until the time the data is returned), the protocol macro may not be able to receive all of the data.

When using protocol macros, some time is necessary after sending data from the Programmable Controllers before the Programmable Controllers will be able to receive data.

Refer to the following data; the values are guidelines.

CS1W-SCB21/41-V1 Communications Board, CS1W-SCU21-V1 Communications Unit, or CJ1W-SCU21/41 Communications Unit

Baud rate (bit/s)Time lag (μs)
12001116
2400578
4800288
9600144
1920073
3840036

C200HW-COM04-V1 to 06-V1 Communications Board, or CQM1H-SCB41 Communications Board

Baud rate (bit/s)Time lag (ms)
120030
240015
48008
96005
192003