Omron CJ1W-CRM21, Operation Manual

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Allocated CIO Area Words Section 5-2
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5-2-2 Unit Status (Word n+4)
The Unit status word contains fundamental status and error flags concerning
the Unit. If needed, further details can be found in the IO Controller and IO
Device Status Words. All flags are controlled by the Unit.
Figure 5.4: Word n+4
Bit Name Status Unit operation
01~07 Reserved --- These bits are ignored in the unit. If set, they will be
turned OFF by the Unit the next PLC cycle.
08 Clear all alarm bits The clear alarm bits switch will clear all alarm flags for all IODs. It is rising
edge triggered. The unit will set the switch to OFF when all alarm flags are
cleared.
OFF --> ON Clear alarm bits for all IODs.
ON --> OFF No action.
09~11 Reserved --- These bits are ignored in the unit. If set, they will be
turned OFF by the Unit the next PLC cycle.
12 Set Output Data Valid
(See Note) OFF Mark all output data sent by the IO Controller as
invalid. IO Devices will ignore the data.
ON Mark all output data send by the IO Controller as
valid. IO Devices will accept the data and process it.
13~15 Reserved --- These bits are ignored in the unit. If set, they will be
turned OFF by the Unit the next PLC cycle.
Note The Set Output Data Valid switch controls the Provider Status in the Output Data sent
from the IO Controller to the IO Device. If the IO Device is receiving Output Data with
the Provider Status bit set to invalid then the IO device will discard the Output Data.
The Provider Status can be used in a redundant IO Controller setup where the Active IO
Controller sends it Output Data with the Provider Status set to valid. The other IO
Controller is then in Standby mode and has its Provider Status set to invalid.
To change from Active to Standby and vice versa only the Set Output Data Valid switch
must be set or reset. The IO Device will only use the output data that is valid.
As there is no need to first open connections and sent configurations as this already
has been done this change over is very fast.
When the Output Data Valid flag is PLC mode dependent, the Output Data Valid flag in
this word will be ignored.
For more information see Appendix A PROFINET IO technology.
15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0
Word n+4
Unit error flag
Controller error flag
Error log contains errors flag
Local Config. storage error flag
Local Configuration load error flag
Configuration transfer in progress
File Read error flag
Error log storage error flag