Siemens SIMATIC SM 335 - Module Diagnostic Byte 4 (Byte 3)

Data Exchange with the SM 335
3-36
SM 335 – High-Speed Analog Input/Output Module for the SIMATIC S7-300
6ES7 335-7HG00-8BA1
3.4.6 Module diagnostic byte 4 (byte 3)
Format
Two different errors are flagged in module diagnostic byte 4
(see Figure 3-13).
ADC/DAC fault
76543210
EEPROM
Fig. 3-13 Module diagnostic byte 4
EEPROM fault
Bit 2 is set in module diagnostic byte 4 when the SM 335 detects an internal error
in the EEPROM.
ADC/DAC fault
Bit 4 is set in module diagnostic byte 4 when the SM 335 detects an analog-digital
or digital-analog conversion fault.
Such an error might occur for one of three reasons:
• No 24 V load voltage or below 15 V
• EMC problem
• Internal hardware fault