Siemens S7-1200 - GET_DIAG (Read Diagnostic Information) Instruction

Extended instructions
8.5 Diagnostics (PROFINET or PROFIBUS)
S7-1200 Programmable controller
358 System Manual, 03/2014, A5E02486680-AG
Table 8- 139 Example 3: PROFINET slave device "et200s_1" is disconnected (cable disconnected or
power loss) from the PROFINET network. A value of 0xFFFF_1F00 is returned for
MODE 2 (Module defective).
Byte with value
Bit pattern with value
Notes
Byte 1 0xFF
Bit 7 1111-1111 Bit 0
Bit 0 is true; data is available.
Byte 2 0xFF
Bit 15 1111-1111 Bit 8
Byte 3 0x1F
Bit 23 0001-1111 Bit 16
Byte 4 0x00
Bit 31 0000-0000 Bit 24
The modules in slots 1 through 20 (Bits 1 through 20)
are all marked as defective since the device is
missing.
MODE 5 (Problem in module) shows the same information as MODE 2 (Module defective).
8.5.6
GET_DIAG (Read diagnostic information) instruction
Description
You can use the "GET_DIAG" instruction to read out the diagnostic information of a
hardware device. The hardware device is selected with the LADDR parameter. With the
MODE parameter, you select which diagnostic information to read.
Table 8- 140 GET_DIAG instruction
LAD / FBD
SCL
Description
ret_val := GET_DIAG(
mode:=_uint_in_,
laddr:=_word_in_,
cnt_diag=>_uint_out_,
diag:=_variant_inout_,
detail:=_variant_inout_);
Reads the diagnostic information from an
assigned hardware device.
Parameters
The following table shows the parameters of the "GET_DIAG" instruction: