90
Allocated CIO Area Words
Section 4-2
Freeze mode The User can set the Freeze and Unfreeze bits at the same time, and both will
be transmitted to the targeted slave stations at the same time but the resulting
action at the slave station is defined in the PROFIBUS standards.
Sync mode The User can set the Sync and Unsync bits at the same time, and both will be
transmitted to the targeted slave stations at the same time, but the resulting
action at the slave station is defined in the PROFIBUS standards.
4-2-3 Unit Status (Word n+4)
The Unit status word contains all the status and error flags concerning the
Unit itself, as well as error flags, which indicate the presence of error flags in
the Master and Slave Status Words. All bits are controlled by the Unit.
13 Sync ON User The Sync command forces the slave stations in to the Sync mode. In
this mode the slave station will not update its outputs and continues to
use the output data received before the Sync command.
If the slave station is already in the Sync mode, a new Sync command
will force the slave to update its outputs only once, with the most recent
output data received from the Master.
OFF User The bit set to OFF indicates that the Sync command will not be trans-
ferred to the slave stations.
14
to
15
Reserved by sys-
tem
--- --- These bits are reserved by the system and will ignored by the Unit.
Bit Name Status Controlled
by
Unit operation
Bit 10 Bit 11
Resulting action at slave
OFF OFF
No change in function
OFF ON
Slave station will be in Freeze mode
ON OFF
Slave station will be in Unfreeze mode
ON ON
Slave station will be in Unfreeze mode
Bit 12 Bit 13
Resulting action at slave
OFF OFF
No change in function
OFF ON
Slave station will be in Sync mode
ON OFF
Slave station will be in Unsync mode
ON ON
Slave station will be in Unsync mode
15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0
Word n+4
Unit error flag
Master error flag
Error log contains new errors
Parameter transfer in progress
Local parameter storage error
Local parameter load error
File read error
Error log storage error
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