Siemens CPU 312 IFM User Manual

CPU 31x-2 as DP Master/DP Slave and Direct Communication
2-22
PLC S7-300, CPU Specifications CPU 312 IFM to CPU 318-2 DP
A5E00111190-01
STEP 7 User Program
STL Description
CALL SFC 59
REQ :=TRUE
IOID :=B#16#54
LADDR :=W#16#200
RECNUM :=B#16#1
RET_VAL :=
BUSY :=TRUE
RECORD :=DB 10
Request to Read
Identifier of the Address Area, here the I/O input
Logical address of the module
Data record 1 is to be read out
Errors result in the output of an error code
Reading process is not finished
Destination area for the read data record 1 is data
block 10
Diagnostic Addresses
With a CPU 31x-2, you assign the diagnostic addresses for the PROFIBUS-DP.
Make sure during configuration that DP diagnostic addresses are assigned to both
the DP master and the DP slave.
During configuration you must specify two diagnostic
addresses:
PROFIBUS
CPU 31x-2 as DP SlaveCPU 31x-2 as DP Master
Diagnostic address
Diagnostic address
When you configure the DP master, you
must specify (in the associated project of
the DP master) a diagnostic address for
the DP slave. In the following, this
diagnostic address is referred to as
allocated to the DP master.
When you configure the DP slave, you
must also specify (in the associated
project of the DP slave) a diagnostic
address that is allocated to the DP slave.
In the following, this diagnostic address
is referred to as allocated to the DP
slave.
The DP master receives information on
the status of the DP slave or on a bus
interruption via this diagnostic address
(see also Table 2-3 on page 2-11).
The DP slave receives information on
the status of the DP master or on a bus
interruption via this diagnostic address
(see also Table 2-8).
Figure 2-5 Diagnostic Addresses for DP Master and DP Slave

Siemens CPU 312 IFM Specifications

General

Brand	Siemens
Model	CPU 312 IFM
Category	Controller
Language	English