SBC PCD2.M5 Series - Operating States

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