Description of blocks
3.3 Driver module DRV_3VL
Library SENTRON 3WL / 3VL for SIMATIC PCS 7
98
Function Manual, 11/2008, A5E02316914A-01
Resetting Tripped and Local turn off states
If the block is in one of the two states, it has to be reset before an On command can be
output again. The faceplate features a corresponding button for the user for this RESET.
CAUTION
Before the circuit breaker is switched back on, the reason for tripping/switching off must be
established and possible error causes must be rectified.
NOTICE
If such a state 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
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 3VL 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.
Summary of Contents for SENTRON 3WL
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