APPX
Appendix 7 Processing Time
389
A
Processing time of communications using MODBUS/TCP
The following shows the time required by the Ethernet-equipped module when it receives a request message from the
MODBUS/TCP master device, completes the processing, and sends a response message.
■Calculation formula
Ts l = K s1 + ( K s 2 n1) + (St n2) [ms]
Variable Meaning Processing time, constant
Tsl Request message processing time (performance of the automatic response
function) (unit: ms)
Ks1 Internal processing time of the automatic response function (unit: ms) Fixed to 2.5ms
Ks2 Communication time between the Ethernet-equipped module and CPU module
(unit: ms)
Fixed to 4.5ms
St Own station scan time (unit: ms)
n1 Function code for the processing target and setting details of the memory
assignment
Function code CPU module device
assignment
Buffer memory
assignment
01 1 0
02 1 0
03 1 0
04 1 0
05 1 0
06 1 0
15 1 0
16 1 0
20 1 0
21 1 0
22 2 0
23 2 0
n2 Function code for the processing target and setting details of the memory
assignment
Function code CPU module device
assignment
Buffer memory
assignment
Normal Worst
case
01 1 2 0
02 1 2 0
03 1 2 0
04 1 2 0
05 1 2 0
06 1 2 0
15 1 2 0
16 1 2 0
20 1 2 0
21 1 2 0
22 2 4 0
23 2 4 0
To Next Page
Loading...
