Final Throughput Calculation And Analysis - ABB TPU2000 Technical Manual

TPU2000/2000R Modbus/Modbus Plus/ Modbus TCP/IP Automation Guide
Event Records
Config Settings
Primary Settings
Master Trip Settings
Test Setup:
TPU2000/TPU2000R COMM Port Settings: 9600, E,7,2, through the FRONT RS-232 port
MODLINK Setup: 500 ms Poll though COM1 on a 486DX100 Notebook Serial Port
TPU2000/TPU2000R is "idle", No Current/Voltage applied.
Write Min - Writing to update the Write Link side in ModLink
Write Max - Time to Write 3 Sets of parameters to EEPROM and Return Response
Write Max times ARE proportional to the size of the block being written, the larger the block,
the longer the write time.
For the example, the TPU2000/TPU2000R generation time for the sample example can range from 1.497 mS to
10.688 mS

Final Throughput Calculation and Analysis

A final calculation of our example throughput is warranted. For this example, the host update time shall now be
assumed to be 250 mS. This 250 mS shall be an example estimation or time to generate a command, interpret
the received command and update the screen. This is just for this example and varies according to:
•
Speed of the host processor (hardware bus structure, # of processors, video card update,
RAM memory, microprocessor speed.....)
•
Operating system selected (LINUX, UNIX, OS2, WIN NT, WIN 3.1, WIN 98, WIN 95, ....)
•
MMI Port Driver Efficiency (PRICOM, Power RICH, USDATA)
Two results will be calculated, operation at 1200 and 19200 baud. The example is described as per Figure 11
within this document. The formula used to produce the typical response is:
System Throughput = Host Processing Time + String Transmit Time + TPU2000/TPU2000R Processing Time +
String Reception Time
At 1200 Baud:
527.248 mS = 250 mS + 141.61 mS + 10.688mS (using worst case)+ 124.95 mS
At 19200 Baud:
277.36 = 250 mS + 8.857 mS + 10.688 (using worst case) mS + 7.815 mS
Figures 5-76 and 5-77 illustrate the individual contributions from each of the components as a percentage of total
transaction time.
41281 12
60001 21
60257 39
61665 10
9.927 23.237
18.657 23.477 39.224
27.557 37.834 67.129
9.728 17.660 22.935
289.634
497.97
110.169
252