HBM MP85A - Page 102

Communication with a control system
102 A0293_06_E00_03 HBM: public MP85A
While not all measured curve data has been saved to the PC, the files have the
extension .tmp. Once data transfer is complete, the files are renamed with the
extension C85 or D85. This ensures that downstream software can reliably
detect the backup status and only accesses the process data when backup is
complete.
Typical process times during ongoing production in combination with
PLC machine control
The table below shows the approximate times required if the MP85A process
controller is exchanging cyclical data with a PLC via PROFIBUS, saving data
to an MMC/SD card or transferring it via Ethernet. The INDUSTRYmonitor soft
ware is running on the PC. The values that are actually achieved depend on
which hardware is used (PC), the network components (switch), and the net
work load. Times can vary widely from one process to another with Ethernet in
particular, due to the latency time.
Configuration (cyclical data was also exchanged via
PROFIBUS)
Time require
ment in s
(approx.)
1 x MP85A process controller, 500 measurement points, save
curves and results on MMC/SD card
2
3 x MP85A process controller, 600 measurement points, save
curves and results on MMC/SD card
2
1 x MP85A process controller, 500 measurement points, output
curves and results via Ethernet, Ethernet connected directly
4 / 5
3 x MP85A process controllers, 500 measurement points, output
curves and results via Ethernet, Ethernet connected via switch
4 / 5
3 x MP85A process controllers, 600 measurement points, output
curves and results via Ethernet, Ethernet connected via switch
4 / 6
3 x MP85A process controllers, 600 measurement points, output
curves only via Ethernet, Ethernet connected via switch
2 – 3