CPU 31x-2 as DP Master/DP Slave and Direct Communication
2-29
PLC S7-300, CPU Specifications CPU 312 IFM to CPU 318-2 DP
A5E00111190-01
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+1
01
H
: Code for Diagnostic Interrupt
02
H
: Code for Process Interrupt
Byte x +4
to
byte x +7
Byte x
70
Bit No.
Length of the station diagnosis
incl. byte x (= max. 20 bytes)
Code for station diagnostics
00
6
Byte x+2
Byte x+3
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
H
etc.)
(Always 0)
Diagnostic data (see Figure 2-9) or
Interrupt data
70
00000000
Figure 2-8 Structure of the Station Diagnosis
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