System Introduction
2–9
1070 072 262-101 (01.09) GB
Operating elements
RESET button
Select button
Stop/Run switch
Operating element
Description
RESET button
Restart (admissible in exceptional situations only)
Stop/Run switch
Run
Change between Run/Stop
D
Program runs
D
Outputs are triggered
D
Timer and counter values are processed
Stop
D
The CPU (ZS...) is in Stop mode
D
All outputs are set to ”0”.
D
Remanent markers, timer and counter values re-
main valid
Select button
D
Selector function
D
Display of messages
7-segment displays
Upper display: ZS550 functionality (device)
Lower display: Status code
The status code displayed on the lower display always refers to the ZS550
functionality shown on the upper display.