Description of blocks
3.2 Driver module DRV_3WL
Library SENTRON 3WL / 3VL for SIMATIC PCS 7
Function Manual, 11/2008, A5E02316914A-01
23
3.2.2
Called blocks
The block calls the following blocks:
SFB35 ALARM_8P
SFB52 RDREC
SFB53 WRREC
SFC1
READ_CLK
SFC6
RD_SINFO
SFC20 BLKMOV
SFC21 FILL
3.2.3
Function
The DRV_3WL block is used for measurement acquisition and control and it forms the
interface to the OS.
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.
The user can define the mode in which the block is to run in the faceplate or in a block
parameter (AUT_L).
The setting at the LIOP_SEL input determines which of the parameters is currently active.
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.
Summary of Contents for SENTRON 3WL
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