Data Exchange with the SM 335
3-35
SM 335 – High-Speed Analog Input/Output Module for the SIMATIC S7-300
6ES7 335-7HG00-8BA1
3.4.4 Module diagnostic byte 2 (byte 1)
Content
Module diagnostic byte 2 always contains the fixed value 35
H
.
3.4.5 Module diagnostic byte 3 (byte 2)
Format
Three different errors are flagged in Module Diagnostic Byte 3
(see Figure 3-12).
Measuring range module not/not
properly inserted
76543210
Hardware fault
Operating mode
Fig. 3-12 Module diagnostic byte 3
Measuring range module not connected/not connected correctly
Bit 0 is set in module diagnostic byte 3 when the SM 335 recognizes that no mea-
suring range module has been inserted, or when the measuring range module has
not been properly inserted.
Operating mode
Bit 2 in module diagnostic byte 3 is set when the SM 335 parameter assignment is
invalid.
Hardware fault
Bit 3 is set in module diagnostic byte 3 when the SM 335 detects an internal hard-
ware fault: In this case, the SM 335 outputs 0 V, and all inputs are set to 7FFF
H
and the counter input to FF FF FF
H
.
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