Data Exchange with the SM 335
3-37
SM 335 – High-Speed Analog Input/Output Module for the SIMATIC S7-300
6ES7 335-7HG00-8BA1
3.4.7 Channel-specific diagnostic bytes (bytes 4-15)
Channel type (byte 4)
The SM 335 flags the type of channel in which the error occurred in byte 4 of the
diagnostic data (00
H
: general error; 71
H
input; 73
H
output).
Channel vector (byte 7)
In byte 7 of the diagnostic data, the SM 335 flags the input or output on which a
channel-specific error has been detected.
76543210
Channel input CH0
Channel input CH1
Channel input CH2
Channel input CH3
Channel output CH3
Channel output CH2
Channel output CH1
Channel output CH0
Fig. 3-14 Modification indicator bits for channel-specific diagnostic bytes
Analog input (bytes 8-11)
The SM 335 sets bits in the channel-specific diagnostic bytes for inputs when an
error/fault is detected at one of the inputs. The channel-specific diagnostic bytes
for inputs have the following format:
76543210
Parameter assignment error
Common-mode error
Open wire
Overflow
Underflow
Fig. 3-15 Channel-specific diagnostic byte for an analog input
Parameter assignment error (bytes 8-11, bit 0)
A parameter assignment error has occurred if the bit is set.
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