Saia-Burgess Controls AG
Hardware manual for PCD3 series │ Document 26-789 ENG19│ 2018-06-29
Operating states
PCD3.Mxxx0 Classic CPU and expansion enclosure
3-31
3
3.11 Operating states
The CPU knows the following operating states:
Operating condition Short description
Start Self-diagnosis during approx. 1s after starting up or after a restart
Run Normal execution of the user program after start. If a programming
device is connected via a PCD8.K11x in PGU mode (for example, PG5
in PGU mode), the CPU does not automatically go to the Run status for
safety reasons, but to the Stop status instead
Run conditional Conditional run operation. A condition was set in the debugger (Run
Until...)thathasnotyetbeenfullled
Run with error Same as under Run, but with an error message
Run conditional with
error
Same as under conditional run, but with error message
Stop The Stop status occurs in the following cases:
- Programmer connected in PGU mode when starting up the CPU
- PGU stopped with programmer
- Aconditionalrunrequirementhasbeenfullled
Stop with error Same as under Stop, but with error message
Stop The stop status occurs in the following cases:
- Command stop processed
- A fatal error in the user program
- Hardware error
- No program loaded
- Missing communication mode for a S-Bus PGU or Gateway Master
Port
System diagnostics If the PLC does not enter RUN mode after 2 minutes, it must be returned
for repair
Reset The reset status has the following causes:
- Supply voltage is too low
- Firmware does not start
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