Hardware Manual for the PCD3 Series│Document 26/789; Version E 5│31.01.2005
Saia-Burgess
Controls Ltd.
Operating states
PCD3.Mxxx0 Classic CPUs and expansion housings
3-16
3
CPU
Type
PCD3.M5xx0
Battery module
For PCD3.M3xx0, these LEDs only
LED
Batt
Run
Halt
Error
Run/
Halt
Link
User
Power
Colour
red
green
red
amber
bi-colour
amber
amber
amber
Run
●
●
●
Run cond.
●
/
●
/
●
Run with
error
●
●
●
●
●
Run cond.
w. error
●
/
●
●
/
●
●
Stop
●
Stop with
error
●
●
●
Halt
●
●
●
System
diagnostics
●
/
●
/
●
/
●
/
●
/
●
/
Batt./Cap
Voltage
missing
●
Communi-
cation
●
LED off
●
LED on
●/
LED flashing
Start
Self-diagnosis for approx. 1 sec 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 Run conditional 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
