Mitsubishi Electric FX5-DP-M, User Manual

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APPX
Appendix 4 Processing Time
Transmission delay time
Transmission delay time is the time needed for transmitting I/O data between the CPU module to which the FX5-DP-M is
mounted and the PROFIBUS-DP network during I/O data exchanges.
The transmission delay time of input data and output data differ depending on the data consistency function settings.
Calculation formulas of transmission delay time are shown below.
The calculation formulas are described by using the following abbreviations.
Bc: Bus cycle time
*1
Scan: Scan time
*1 When multiple DP-Masters are deployed on the same network, replace it with TBc.
When Data Consistency Function is disabled
The following shows transmission delay times of reading/writing I/O data with the refresh settings enabled and data
consistency function disabled, or by the MOV instruction or FROM/TO instructions.
■
Transmission delay time of output data
■ Transmission delay time of input data
When Data Consistency Function is enabled
The following shows transmission delay times of reading/writing I/O data with the refresh settings enabled and data
consistency function enabled.
■
Transmission delay time of output data
■
Transmission delay time of input data
Item Transmission delay time
Normal value Bc

1.5
Maximum value Bc

2
Item Transmission delay time
Normal value Scan + Bc
Maximum value Scan + Bc

2
Item Condition Transmission delay time
Normal value  Scan + Bc
Maximum value Scan

2

Bc Bc

3
Scan

2 > Bc Scan

2 + Bc

2
Item Condition Transmission delay time
Normal value  Scan + Bc
Maximum value Scan

2

Bc Scan + Bc
Scan

Bc < Scan

2 Scan + Bc

2
Scan > Bc Scan

3