Description of blocks
3.2 Driver module DRV_3WL
Library SENTRON 3WL / 3VL for SIMATIC PCS 7
24
Function Manual, 11/2008, A5E02316914A-01
Switching the circuit breaker on/off
The user can use the driver block to switch the circuit breaker.
It is important to note here that the ON state means "main contacts closed" and the OFF
state means "main contacts open".
The circuit breaker cannot be switched on or off in certain states:
It must not be switched on when:
•
there is a monitoring error
(QMON_ERR = 1)
•
the block is in maintenance mode
(MAINT = 1)
•
write protection applies
(QWR_PROT = 1)
•
the circuit breaker is already on
(QON = 1)
•
the circuit breaker has tripped
(QTRIP = 1)
•
the circuit breaker has been switched off locally
(QLOC_OFF = 1)
•
the circuit breaker is not ready for an On command
(RDY_ON = 0)
It must not be switched off when:
•
there is a monitoring error
(QMON_ERR = 1)
•
the block is in maintenance mode
(MAINT = 1)
•
write protection applies
(QWR_PROT = 1)
•
the circuit breaker is already off
(QOFF = 1)
•
the circuit breaker has tripped
(QTRIP = 1)
•
the circuit breaker has been switched off locally
(QLOC_OFF = 1)
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
Summary of Contents for SENTRON 3WL
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