Eeprom Error; Adc/Dac Error; Channel-Specific Diagnostics Bytes (Bytes 4 To 15) - Siemens SIMATIC S7-300 Manual

EEPROM error

Bit 2 is set in module diagnostics byte 3 if SM 335 detects an internal error in the EEPROM.

ADC/DAC error

Bit 4 is set in module diagnostics byte 3 if SM 335 detects an internal ADC/DAC error.
This error can have three causes:
● 24 V load voltage missing or less than 15 V
● EMC interference
● Internal hardware fault
3.4.7

Channel-specific diagnostics bytes (bytes 4 to 15)

Channel type (byte 4)
In byte 4 of diagnostics data SM 335 indicates the channel type which is in error state (00
general fault; 71
Channel vector (byte 7)
In byte 7 of diagnostics data SM 335 the input or output at which a channel-specific fault is
active. The corresponding fault information is available in the bytes 8 to 11 (analog inputs),
or in bytes 12 to15 (analog outputs).
Figure 3-14
Note
Channel-specific faults at the analog output channels CH0 to CH3 or output in the
diagnostics view of HW Config as channels CH4 to CH7.
SM 335 - High-speed analog mixed module for SIMATIC S7-300
Manual, 02/2009, A5E02409063-01
input; 73 output).
H H
Image of changes to channel-specific diagnostic data
Data exchange with SM 335
3.4 Evaluating the diagnostics data of SM 335
:
H
65