Siemens CPU 312 IFM User Manual

CPU 31x-2 as DP Master/DP Slave and Direct Communication
2-12
PLC S7-300, CPU Specifications CPU 312 IFM to CPU 318-2 DP
A5E00111190-01
Evaluation in the User Program
Table 2-4 shows you how you can, for example, evaluate RUN-STOP transitions of
the DP slave in the DP master (see Table 2-3).
Table 2-4 Evaluating RUN-STOP Transitions of the DP Slaves in the DP Master
In the DP Master
In the DP Slave (CPU 31x-2DP)
Diagnostic Addresses Example:
Master diagnostic address =1023
Slave diagnostic address in the master
system =1022
Diagnostic Addresses Example:
Slave diagnostic address =422
Master diagnostic address = not relevant
The CPU calls OB 82 with the following
information:
 OB 82_MDL_ADDR:=1022
 OB82_EV_CLASS:=B#16#39
(incoming event)
 OB82_MDL_DEFECT:=Module fault
Tip: The CPU’s diagnostic data buffer also
contains this information
In your user program, you should also
program SFC13 “DPNRM_DG” to fetch
diagnostic data from the DP Slave.
We recommend you use SFB54 when
operating in DPV1 mode. It outputs complete
interrupt information.
CPU: RUN → STOP
CPU generates a DP slave diagnostic frame
(see Section 2.6.4).

Siemens CPU 312 IFM Specifications

General

Brand	Siemens
Model	CPU 312 IFM
Category	Controller
Language	English