Saia-Burgess Controls AG
Manual
Manual PCD 1 / PCD 2 Series
│ Document 26
/
737 E
N22 │ 2013-11-26
CPUs and expansion housings
3-32
PCD2.M1x0/M480 operating states
3
3.11
PCD2.M1x0/M480 operating states
The CPU can assume the following operating states: START, RUN, CONDITIONAL
RUN, STOP, HALT and RESET
The display uses 3 LEDs: RUN
LED yellow
HALT
LED red
ERROR
LED yellow
ST
ART
RUN
COND. RUN
ST
OP
HAL
T
RESET
RUN
●/○
●
●
/○
○
○
●
HALT
●/○
○
○
○
●
●
ERROR
●/○
1)
1)
1)
1)
●
1)
An ERROR may be signalled by the LED in operating states RUN, CONDITIONAL RUN, STOP or HALT. In the
event of an error, the LED only lights up if there is no XOB 13 programmed to deal with this error.
● LED on
●/○
LED flashing
○ LED off
START
Self-diagnosis for approx. 1s after switching on or after a Restart
RUN
Normal processing of the user program after START. Where a programming
device 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
COND. RUN
Conditional RUN state. A condition has been set in the debugger (RUN
until...), which has not yet been met
STOP
The STOP state occurs in the following cases:
• Programming device in PGU mode connected when the CPU was
switched on
• PGU stopped by programming device
• Condition for a COND.RUN has been met
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 a S-Bus PGU or Gateway Master port
RESET
The RESET state has the following causes:
• Supply voltage too low
• Firmware not starting up