Structure Of The Station Diagnosis; Station Diagnostics - Siemens SIMATIC S7-300 Series Reference Manual

2.6.9

Station Diagnostics

Definition
Device diagnostics provides details on a DP Slave. The station diagnosis begins
as of byte x and can have a maximum of 20 bytes.
Station Diagnostics
The figure below describes the structure and content of the bytes for a configured
address area in transfer memory.
Byte x
Byte x+1
Byte x+2
Byte x+3
Byte x +4
to
byte x +7
Figure 2-8

Structure of the Station Diagnosis

PLC S7-300, CPU Specifications CPU 312 IFM to CPU 318-2 DP
A5E00111190-01
CPU 31x-2 as DP Master/DP Slave and Direct Communication
6
7 0 Bit No.
0 0
Length of the station diagnosis
incl. byte x (= max. 20 bytes)
Code for station diagnostics
7 0
0 0 0 0 0 0 0 0
01 : Code for Diagnostic Interrupt
H
02 : Code for Process Interrupt
H
Number of the configured address
area in transfer memory.
Valid is: Number+3
(Example:
CPU = 02
H
1. Address area = 04
H
2. Address area = 05 etc.)
H
(Always 0)
Diagnostic data (see Figure 2-9) or
Interrupt data
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