Hardware manual PCD1.M2220-C15 │ Document 27-640 – Version ENG03 │ 2020-03-25
Saia-Burgess Controls AG
LED operating states
CPU/processor unit
3-11
3
3.7
LED operating states
Three colour LEDs in the following table display the possible operating states of
the CPU.
LED operating states
Meaning
Run
Stop
Err
Form
Colour
Green
Red
Yellow
Run
Run conditional
/
Run with error
Run conditional
with error
/
Stop
Key:
Stop with error
LED off
Stop
LED on
System diagnosis
/
/
/
/
LED flashes
Start
Self-diagnosis for approx. 1 s after switching on or restart
Run
Normal processing of the user program after start.
Run conditional
Conditional run status. A condition was set in the debugger (Run Until...)
that has not yet been fulfilled
Run with error
As “Run”, but with error message
Run cond. with error
As “Run conditional”, but with error message
Stop
The Stop status occurs in the following cases:
- Program unit connected in PGU mode, while the CPU was switched on
- PGU stopped by the programming unit
-
Condition for “Run conditional” was fulfilled
Stop with error
As “Stop”, but with error message
Stop
The Stop status occurs in the following cases:
- Stop instruction processed
- Serious error in the user program
- Hardware error
- No program loaded
- No communication mode for S-Bus PGU or Gateway Master Port
System diagnosis
Reset
The RESET status is caused by the following:
- Power supply too low
- Firmware not started
