Siemens SIMATIC S7-300 Reference Manual page 520

Bytes 2 to 7
Byte 2
Byte 3
Byte 4
Byte 5
Byte 6
Byte 7
Figure B-9
Bytes 8 to 10
From byte 8 up to byte 10, data record 1 contains the channel-specific diagnostic
data. The figure below shows the assignment of the diagnostic byte for a channel
of the SM 338; POS-INPUT.
Figure B-10
B-8
7 6 5 4 3 2 1
0
Scan time-out
7 6 5 4 3 2 1
7 6 5 4 3 2 1
0
Channel type
79 : SM POS-INPUT
H
7
7
7 6 5 4 3 2 1
0 0 0 0 0
Channel error, channel 1
Channel error, channel 2
Bytes 2 and 7 of the Diagnostic Data for the SM 338; POS-INPUT
7 6 5 4 3 2 1
0 0 0 0 0 0
Encoder error (external channel error)
Diagnostic Byte for a Channel of the SM 338; POS-INPUT
0
0
Not relevant
0
0
Number of diagnostics bits that the module
outputs per channel: 8 bits long
0
Number of channels of the same
type in one module: 3 channels
0
Channel error, channel 0
0
Configuration/parameterization error
(internal channel error)
Programmable Logic Controllers S7-300 Module Data
A5E00105505-03