Appendices; Appendix 1 Processing Time - Mitsubishi Electric QJ71E71-100 User Manual

APPENDICES

Appendix 1
Calculate the minimum processing time for each function using the expressions below. Note that the processing time
may become longer depending on the load factor on the network (how congested the line is), the window size of each
connected device, the number of connections, and system configuration. Use the values obtained from the
expressions as a guideline for the processing time when communications are performed in only one connection.
(1) Minimum processing time of communications using a fixed buffer
(communications between the E71s)
(a) Procedure exists
Tfs = St + Ke + (Kdf × Df) + Sr
• Tfs
• St
• Ke, Kdf
• Df
• Sr
Item
Communications using a binary code
Communications using an ASCII code
(b) No procedures
Tfs = St + Ke + (Kdf × Df)
• Tfs
• St
• Ke, Kdf
• Df
Item
Communications using a binary code
[Calculation example]
The time between the QJ71E71-B5 sending 1017-word data of a binary code and it completing the sending
when the QJ71E71-B5 communicates with another QJ71E71-B5 in TCP/IP by the "Procedure Exist" method
(unit: ms)
Assume that the scan time on the sending side is 10ms, and the scan time on the receiving side is 8ms.
63.34 (ms)
340
Processing Time
: The time from the start of sending to the completion of sending (unit: ms)
: Sending station scan time
: Constant (Refer to the table below.)
: Number of send data words
: Receiving station scan time
QJ71E71-100
TCP/IP
communications
Ke Kdf
12 0.0065
12 0.030
: The time from the start of sending to the completion of sending (unit: ms)
: Sending station scan time
: Constant (Refer to the table below.)
: Number of send data bytes
QJ71E71-100
TCP/IP
communications
Ke Kdf
7 0.0018
10 + 25 + (0.020 × 1017) + 8
UDP/IP TCP/IP
communications communications
Ke Kdf Ke
10 0.0069 25
10 0.029 25
UDP/IP TCP/IP
communications communications
Ke Kdf Ke
4 0.0014 16
QJ71E71-B5, QJ71E71-B2
UDP/IP
communications
Kdf Ke
0.020 20 0.019
0.068 21 0.068
QJ71E71-B5, QJ71E71-B2
UDP/IP
communications
Kdf Ke
0.0057 9 0.0025
Kdf
Kdf