Data Exchange Between User Program And As−I Slaves; Exchanging As−I Binary Values With Standard Or A Slaves - Siemens SIMATIC NET CP 343-2 Manual

4 Data Exchange between User Program and
AS−i Slaves
This chapter provides you with the information you require to access the data of
the AS-i slaves from the PLC user program via the CP 343-2. The chapter explains
the transfer of the following:
S Binary values of the standard or A slaves via the PLC I/Os
S Binary values of the B slaves by reading or writing data record 150
S Analog values of the AS-i analog slaves complying with profile 7.3/7.4 by
reading or writing data records 140−147
For information on using the data record numbers with the CPU 318, refer to
"Restrictions" in Section 1.1.
4.1 Exchanging AS−i Binary Values with Standard or A
Slaves
Interface between PLC CPU and
You can access the binary values of AS-i standard slaves or A slaves in the user
program using suitable STEP 7 I/O commands.
PLC CPU
I/O commands
(e.g. L PIW 288)
I/O commands
(e.g. T PQD 260)
Figure 4-1
CP 343−2 / CP 343−2 P AS−Interface Master
Release 08/2008
C79000−G8976−C149−04
CP 343-2
CP 343-2
Backplane bus
Standard / A
slaves
Í Í Í
Í Í Í Í Í Í Í Î Î Î
Í Í Í Í Î Î Î
Í Í Í Í Í Í Í
Í Í Í
Î Î Î Î Î Î Î
Î Î Î Î
Î Î Î Î
Í Í Í
Î Î Î
Î Î Î
AS-Interface
AS-i
slave 1
AS-i
slave 2
.
.
.
AS-i
slave
31
39