Siemens SIMATIC SM 335 Manual page 60

Data Exchange with the SM 335
Open-wire test (DR1, Byte 12)
You use the open-wire test parameter (byte 12 in data record 1) to determine whe-
ther an open-wire test is to be executed for the relevant analog input.
Fig. 3-5
3-22
7 6 5 4 3 2 1 0
Analog input CH3
= 1: Test channel for open wire
= 0: No test
Meaning of the bits in the "open-wire test" byte
SM 335 - High-Speed Analog Input/Output Module for the SIMATIC S7-300
Analog input CH0
Analog input CH1
Analog input CH2
6ES7 335-7HG00-8BA1