External Error; Channel Error; 24 V Load Voltage Missing; Sm 335 Is Not Parameterized - Siemens SIMATIC S7-300 Manual

External error

Bit 2 is set in module diagnostics byte 0 if one of the following errors has occurred:
● Measuring range module not inserted
● Incorrect insertion of the measuring range module (mismatch between the default
● External auxiliary voltage failed
● Fault at one of the inputs
● Fault at one of the outputs (short-circuit to ground)

Channel error

Bit 3 in the module diagnostics byte is set after SM 335 has detected a channel-specific error
at one of the channels. For more information, analyze the channel-specific diagnostics bytes
(bytes 8 to 15).

24 V load voltage missing

Bit 4 is set in module diagnostics byte 0 after the 24 V load voltage has failed.

SM 335 is not parameterized

Bit 6 is set in module diagnostics byte 0 if SM 335 was not parameterized.
Incorrect parameters
Bit 7 is set in module diagnostics byte 0 if SM 335 was not parameterized correctly, i.e.
mismatch between the parameters and the position of the measuring range module on SM
335. This bit is set if any errors in the parameterization are found (e.g. during the transfer of
parameters by means of SFC 55 "WR_PARM" or SFB 53 "WRREC".
3.4.4 Module diagnostics byte 1
Structure
Module diagnostics byte 1 always contains the fixed value 35
SM 335 - High-speed analog mixed module for SIMATIC S7-300
Manual, 02/2009, A5E02409063-01
parameters and the position of the measuring range module)
– Common mode error (ground fault)
– Wire break
– Measuring range overflow
– Measuring range underflow
Data exchange with SM 335
3.4 Evaluating the diagnostics data of SM 335
H
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