Siemens SIGUARD LS4-4 Anleitung Seite 34

As a further option, in addition to the possibility of bus addressing by means of the M12
connector socket X1, a bus address may be allocated to the LS4 AS-Interface by
means of this addressing socket. To do this, a standard AS-Interface programming
device for the definition of bus addresses should be used, in conjunction with a special
addressing socket programming cable (see chapter 8, "Advice on selection and
ordering, AS-i safety accessories").
For parameterisation purposes, and for local diagnosis of the LS4, a PC with the
LS4soft software is connected to the top side of the LS4 AS-Interface adapter by
means of an RS232 interface, the programming cable and the optical interface. The
cable exit of the PC adapter on the LS4 AS-Interface thus points in the direction of the
protective field. A powerful magnet in the PC adapter not only brings about a
mechanical halt but at the same time informs a reed contact in the device that the PC
adapter is connected.
As the power supply for the PC adapter comes through the PC's COM port, the latter
must be "RS232 compliant", that is, with a load of 3 kOhm it must still be able to supply
a voltage of 5 V. The claim to be "RS232-compliant" that is occasionally found with
Notebook PCs is not sufficient here. The LS4 AS-Interface adapter registers the flow of
data in passing, but not does not act on it in any way. This interface therefore
corresponds, in functional terms, to the RS232 interface connected to the LS4 by
means of SUB-D plugs.
A comprehensive description of the software may be found in the LS4soft User Man-
ual.
Fig. 4.1-2: Connecting PC and LS4 PROFIsafe with optical PC adapter
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