Operating States - SBC PCD2.M5 Series Manual

Saia-Burgess Controls AG
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
LED
Colour
Run
Run cond.
Run with error
Run cond. with error
Stop
Stop with error
Halt
System diagnostics
Battery voltage
Start
Run
Run conditional Conditional Run state. A condition has been set in the debugger (Run
Run with error
Run cond. with
error
Stop
Stop with error Same as Stop, but with an error message
Halt
System
diagnostics
Reset
Hardware Manual for the PCD2.M5 Series│Document 26/856; Version EN 1 2│2014-07-24
Batt WD
Red Yellow
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Self-diagnosis for approx. 1sec after switching on or after a Restart
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
until...), which has not yet been met
Same as Run, but with an error message
Same as conditional Run, but with an error message
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
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
The RESET state has the following causes:
• Supply voltage too low
• Firmware not starting up
PCD2.M5_ Classic CPUs and expansion housings
PCD2.M5_
Run Halt Error
Green Red Yellow
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Operating states

LED off
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LED on
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LED flashing
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