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Siemens simatic laser scanner LS4 type 3RG78346DD00
SIEMENS SIMATIC LASER SCANNER LS4 TYPE 3RG78346DD00
Possibilities of a protective field switch at the laser scanner in practice
With its continuous detection of the environment, its long range and four switchable field pairs, the laser scanner LS4-4 is suitable even for difficult applications. However, often the question arises on how the four field pairs can be switched by the process in practice. The following documentation illustrates how a protective field switch is possible for the various application areas of the laser scanner and which hardware can be employed for this
The required field pair outlines can be conveniently defined with the application software "LS4soft".
The field pairs are activated by applying 24 V to the respective inputs, which are available from the X1 plug of the scanner.
When switching field pairs, note that the new field pair has to be activated first before deactivating the previous one. The process must take no more than 1 second. If this time is
exceeded or the previous field pair is deactivated first, it has to be assumed that the application or the sensing unit for the field pair switch is faulty.
This results in the immediate deactivation of the two safety semiconductor outputs (OSSD) of the laser scanner LS4. In addition, the LEDs at the LS4 will indicate a malfunction,
which can be verified and assigned by the software "LS4soft".
PROFIsafe Protective Field Switching via PROFIBUS employing a CPU 315F
While the parameterization of the laser scanner LS4 is carried out via the PC software LS4soft, the PC adapter and the optical interface at the PROFIsafe adapter, the scanner on the side of the master in most cases a safety PLC with PROFIsafe master has to be integrated into the application program.
PROFIsafe is a functional expansion of the PROFIBUS DP and enables the operation of safe bus components together with non-safe standard components on the same bus.
PROFIsafe devices do not require any changes to existing hardware components and seamlessly integrate into existing systems.
The safety-oriented S7 CPU (F-CPU) and laser scanner LS4 communicate via PROFIBUS. In this case, the LS4 supplies cyclical input data with a length of 1 Byte to the S7 CPU. The LS4 in turn expects cyclical output data with a length of 1 Byte from the S7 CPU. This input and output data can then be processed or analyzed by the application-oriented and safety-oriented STEP7 program.
Further information on fail-safe sensors can be found on /simatic-sensors/fs
