Hardware Manual for the PCD2.M5 Series│Document 26/856; Version EN 12│2014-07-24
Saia-Burgess Controls AG
Operating states
PCD2.M5_ Classic CPUs and expansion housings
3-27
3
3.8
Operating states
The CPU can assume the following operating states:
Run, Run conditional, Run with error, Run cond. with error, Stop, Stop with error, Halt
and System Diagnostics. The display uses the LEDs shown below:
CPU type
PCD2.M5_
LED
Batt
WD
Run
Halt
Error
Colour
Red
Yellow
Green
Red
Yellow
Run
●
LED off
●
LED on
●
/
LED flashing
Run cond.
●
/
Run with error
●
●
Run cond. with error
●
/
●
Stop
Stop with error
●
Halt
●
System diagnostics
●
/
●
/
●
/
Battery voltage
●
●
Start
Self-diagnosis for approx. 1sec after switching on or after a Restart
Run
Normal processing of the user program after Start. Where a programming
unit is connected via a PCD8.K11x in PGU mode (e.g. PG5 in PGU mode),
the CPU automatically goes into the Stop state and not the Run state; this
is for safety reasons
Run conditional
Conditional Run state. A condition has been set in the debugger (Run
until...), which has not yet been met
Run with error Same as Run, but with an error message
Run cond. with
error
Same as conditional Run, but with an error message
Stop
The Stop state occurs in the following cases:
• Programming unit in PGU mode connected when the CPU was switched
on
• PGU stopped by programming unit
• Condition for a COND.RUN has been met
Stop with error Same as Stop, but with an error message
Halt
The Halt state occurs in the following cases:
• Halt instruction processed
• Serious error in user program
• Hardware fault
• No program loaded
• no communication module on an S-Bus PGU or
Gateway Master port
System
diagnostics
Reset
The RESET state has the following causes:
• Supply voltage too low
• Firmware not starting up