SIEMENS AG PRODAVE S7
Toolbox for Data Link PGs/PCs to SIMATIC S7
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4.1 Basic Functions
load_tool
This function initialises the adaptor, checks if the driver is loaded, initialises the
parameterised addresses and switches the selected interface to active. Under
under Windows 95/98/NT/ME/2000 it is possible to parameterise a maximum of
32 connections.
The following 3 parameters are transferred to this function:
no number of active connection (1..32).
device device name (zero terminated) of the used driver
e.g. “S7ONLINE“ for the MPI driver or ZERO (default).
adr_table pointer to address list of the connected party.
In this instance “adr“ = 0 is interpreted as the end identifier of
the list.
Structure Address List:
#pragma pack(1)
struct {
unsigned char adr; /* station address default 2 */
unsigned char segmentid; /* segment id default 0 */
unsigned char slotno; /* slot no default 2 */
unsigned char rackno; /* rack no default 0 */
} adr_table[5];
#pragma pack()
Each party is identified by means of an entry in the address list:
adr station address of party
segmentid segment ID of party = 0 (reserved for later expansions)
slotno slot number of party
rackno rack number of party = 0
A connected party is selected by means of the “no“ parameter of function
load_tool and via the new_ss function:
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