Communications configuring
3-156 System- and communication configuring D7-SYS - SIMADYN D
Edition 12.2003
SIMATIC S7-CPU
(SL program)
FM 458
(CFC program)
HW Config
P-bus
memory
of the FM 458
L 1.234568e+038
T PAD 512
L 2.000000e+000
T PAD 516
L 1234
T PAW 520
L 12345678
T PAD 524
L B#16#80
T PAB 528
L 5678
T PAW 530
OFF Y R
S7RD
2.0
1
0
OFF Y R
S7RD
1.234568e+38
3
OFF Y DI
S7RD_D
OFF Y I
S7RD_I
1234
4
OFF Q BO
S7RD_B
16
OFF Y I
S7RD_I
9
1
1.23e+38
R X
1 OFF
S7WR
BO I
0
OFF
S7WR_B
I X
4 OFF
S7WR_I
DI X
3
OFF
S7WR_D
3456
16#12345678
L PEB 512
T MB 20
L PED 516
T MD 22
L PEW 520
T MW 26
L PED 524
T MD 28
not used!
not used!
1
5678
not used!
not used!
B#16#FF
1.23 e+038
3456
DW#16#12345678
Send
function blocks (write)
Send memory
(128 bytes)
0:
1:
2:
3:
4:
5:
6:
7:
8:
9:
10:
11:
12:
13:
14:
15:
16:
17:
127:
....
....
Receive
Receive
function blocks (read)
Receive
memory
(128 bytes)
Send
0:
1:
2:
3:
4:
5:
6:
7:
8:
9:
10:
11:
12:
13:
14:
15:
16:
17:
18:
19:
20:
127:
....
....
16#12345678
Fig. 3-50 Data transfer with peripheral accesses (I/O accesses)
3.16.4 Transferring data sets
If extremely large quantities of data are to be transferred, e.g. for
visualization applications (WinCC), or if data have to be transferred
between SIMATIC and FM 458 for an extremely high number of drives.
• Memory available on the P bus: 114688 bytes (0x1C000 hex), for
various "data sets" (or "telegrams").
• max. 125 read and 125 write data sets
• max. length per data set (telegram): 240 bytes
Application
Features,
limit values
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