B&R Automation PC 620, User Manual

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Appendix A • Maintenance Controller Extended (MTCX)
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545 Automation PC 620 with 945GME N270 CPU board User's Manual V 1.10
3.1 SDL timing
Basic procedure:
1) On every Automation Panel 900 display unit, the data (button and LED, touch screen,
service data) is nominally determined asynchronously every 16 ms, saved and made
available.
2) The MTCX in the APC620 samples one display unit after another asynchronously in 1 ms
increments. The status is requested within the 15 ms nominal cycle (maximum 15 display
units x 1 ms), regardless of the total number of display units connected in the system
(Graphics Engine 1 + Graphics Engine 2), and the information is saved in the MTCX's Dual-
Ported RAM.
3) An application can access the MTXC data using the programming interface (API) ADI
(Automation Device Interface). Reading or writing data does not affect the asynchronous
acquisition of data from the connected display units.
Further information about this can be found in the "ADI Development Kit" and the
"Automation PC 620 / Panel PC 700 Implementation Guide" (both available on the B&R
Homepage).
Figure 327: Sample configuration for SDL timing
Automation PC 620
SDL
Automation Panel 900
Graphics Engine 1
Graphics Engine 2
Automation Panel 900
SDL
MTCX 1 ms cycle
All data from connected displays transmitted at a nominal 15 ms interval
SDL
Automation Panel 900
new data every 16 ms (nominal)
Automation Panel 900
SDL
new data every 16 ms (nominal)
new data every 16 ms (nominal) new data every 16 ms (nominal)