Pcd1.M1X0 And Pcd1.M1X5 Operating States - SBC PCD1 Series Manual

Saia-Burgess Controls AG
3.10

PCD1.M1x0 and PCD1.M1x5 operating states

The CPU can assume the following operating states:
START, RUN, CONDITIONAL RUN, STOP and HALT
The display uses 3 LEDs: SUPPLY 24 V
The "SUPPLY 24
The RUN and ERROR LEDs together show the operating state of the CPU:
RUN
ERROR
An ERROR may be signalled by the LED in operating states RUN, CONDITIONAL RUN, STOP or HALT. In the
1)
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
RUN
COND. RUN
STOP
HALT
RESET
Manual Manual PCD 1 / PCD 2 Series │ D ocument 26 / 737 EN22 │ 2 013-11-26
RUN
ERROR
" LED shows that the electrical supply is working.
VDC
●/○ ● ●/○
●/○
1) 1)
Self-diagnosis for approx. 1s after switching on or after a Restart
Normal processing of the user program after START. Where a programming
device is connected 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
Conditional RUN state A condition has been set in the debugger (RUN
until..), which has not yet been met
The STOP state occurs in the following cases:
• Programming device in PGU mode connected when CPU switched on
• PGU stopped by programming device
• 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 a S-Bus PGU or Gateway Master port
The RESET state has the following causes:
• Supply voltage too low
• Firmware not starting up
PCD1.M1x0 and PCD1.M1x5 operating states
LED yellow
DC
LED yellow
LED red
○ ○ ●
●
1) 1)
CPUs and expansion housings
3
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