Description of blocks
3.2 Driver module DRV_3WL
Library SENTRON 3WL / 3VL for SIMATIC PCS 7
Function Manual, 11/2008, A5E02316914A-01
25
Feedback monitoring
When monitoring is activated (MONITOR = On), switching commands (ON / OFF) and the
resetting of trips are time monitored. If the expected state is not reached after an operation
and within the monitoring time (TIME_MON), the block outputs a message and goes into a
resetting state (QMON_ERR).
The faceplate features an appropriate RESET button for resetting this state again.
NOTICE
If the monitoring error is reset the response of the mode must be observed as it may cause
a switching operation of the circuit breaker under certain circumstances.
See Automatic / Manual mode switchover
Measured value acquisition
The block reads measured values from the cyclic process image.
When operating 3WL on the DP master system directly, the block also reads data record 94
with the system function block RDREC (SFB52).
The data record is read in a defined cycle. The interval at which the data record can be read
can be set in seconds using the input parameter CYCLE_T. The default setting is 60
seconds. A cycle of 0 seconds or less means that this data record is not read.
Time synchronization
Data record 68 writes the current time in cycles in order to transfer the current time to the
circuit breaker. This cycle can be set in seconds using the TIME_SYNC_T parameter.
Diagnostics and maintenance
In order to display the current state of the circuit breaker, modules present, statistics
information and diagnostic messages, the module reads the status word from the process
image and data records 91 and 92.
The process image is called in cycles. The user can request the data records in the faceplate
via operations. The diagnostic messages are updated in cycles when messages are present.
WARNING
During maintenance work on the circuit breaker, maintenance mode must be activated!
At the same time, the circuit breaker must be locked locally to prevent it being switched
back on.
Maintenance specifications apply to the circuit breakers (in accordance with EN 50 110-1,
DIN VDE 0105-100 and BGV A2).
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