Description of blocks
3.3 Driver module DRV_3VL
Library SENTRON 3WL / 3VL for SIMATIC PCS 7
Function Manual, 11/2008, A5E02316914A-01
97
Automatic / manual mode switch over
Automatic and manual mode are available for operating the driver block. When in manual
mode, the user can control the circuit breaker position (ON / OFF) of the faceplate in WinCC.
When in automatic mode, the corresponding buttons are locked (cannot be operated) in the
faceplate and the circuit breaker is controlled by input parameters which can be connected in
the CFC (AUTO_ON / AUTO_OFF) and therefore by the AS program.
NOTICE
If an error occurs (monitoring error, Local turn off, Tripped) the block changes to Forced
manual. If the pending error state is acknowledged with one of the RESET buttons, the
block goes into the specified mode again.
If Automatic mode is specified by the AS program (LIOP_SEL = 1, AUT_L = 1) the
commands present at AUTO_ON or AUTO_OFF are always output.
Under certain circumstances this means that resetting error states may cause a switching
operation of the circuit breaker. If this is not desired the user must configure the AS
program accordingly.
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)
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)
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