Festo EMCS-ST - Page 57

Festo — EMCS-ST — 2021-03b
Drive system
57
"Digital inputs/outputs (DIO)" or "IO-Link (LK)" master control
After switching on the power supplies and initialising the EMCS-ST, the master control is automatically
assigned to the "digital inputs/outputs (DIO)" control interface. The detection of an active IO-Link
master causes the master control to switch automatically to the "IO-Link" control interface. If the
IO-Link communication is interrupted, the master control automatically returns to the "digital inputs/
outputs (DIO)" control interface.
Timing
The diagram shows the automatic transfer of the master control between the "digital inputs/outputs
(DIO)" and "IO-Link (LK)" control interfaces.
1
2
3
4
5
Fig. 17: "Digital inputs/outputs (DIO)" or "IO-Link (LK)" master control
1
IO-Link master active "control interface
[Logic]"
2
Master control "DIO"
3
Master control "IO-Link"
4
LED C/Q (system referenced)
5
LED C/Q (system not referenced)
"Display and operating component (HMI)" master control
After unlocking the pushbutton actuators (HMI), the master control is automatically assigned to the
"display and operating components (HMI)" interface. When the display and operating components
(HMI) are locked, the master control automatically switches back to the last active "digital inputs/
outputs (DIO)" or "IO-Link (LK)" control interface.
Timing
The diagram shows the transfer of the master control between the "Digital inputs/outputs (DIO) or
IO-Link (LK)" control interface and the "Display and control element (HMI)" interface.