Siemens S7-1200 System Manual page 350

Extended instructions
8.5 Diagnostics (PROFINET or PROFIBUS)
Table 8- 122 Example 2: A module has been pulled from PROFIBUS slave device "DPSlave_12". A
Byte with value
Device 12 (Bit 12) is marked as defective.
Table 8- 123 Example 2 (continued): A module has been pulled from PROFIBUS slave device
Byte with value
Even though device 12 (Bit 12) has an error as shown in MODE 2 (Device defective) above, the
Table 8- 124 Example 3: PROFIBUS slave device "DPSlave_12" is disconnected (cable disconnected
Byte with value
Device 12 (Bit 12) is marked as not existing. With this exception, devices 10 through 25 still report as
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value of 0x0110_0000 is returned for MODE 2 (Device defective).
Bit pattern with value
Byte 1 0x01 Bit 7 0000-0001 Bit 0
Byte 2 0x10 Bit 15 0001-0000 Bit 8
Byte 3 0x00 Bit 23 0000-0000 Bit 16
Byte 4 0x00 Bit 31 0000-0000 Bit 24
MODE 5 (Problem in device) returns the same information as MODE 2 (Device defective).
"DPSlave_12". A value of 0x01FC_FF03 is returned for MODE 4 (Device exists).
Bit pattern with value
Byte 1 0x01 Bit 7 0000-0001 Bit 0
Byte 2 0xFC Bit 15 1111-1100 Bit 8
Byte 3 0xFF Bit 23 1111-1111 Bit 16
Byte 4 0x03 Bit 31 0000-0011 Bit 24
device is still functioning on the network which causes MODE 4 (Device exists) to show the device
as an "existing device".
or power loss) from the PROFIBUS network. "DPSlave_12" is still detected as a
defective device as well as an error in the device. The difference is that "DPSlave_12" is
no longer detected as a device that exists. A value of 0x01EC_FF03 is returned for
MODE 4 (Device exists).
Bit pattern with value
Byte 1 0x01 Bit 7 0000-0001 Bit 0
Byte 2 0xEC Bit 15 1110-1100 Bit 8
Byte 3 0xFF Bit 23 1111-1111 Bit 16
Byte 4 0x03 Bit 31 0000-0011 Bit 24
existing.
Notes
Bit 0 is true; data is available.
Notes
Bit 0 is true; data is available.
Notes
Bit 0 is true; data is available.
S7-1200 Programmable controller
System Manual, 03/2014, A5E02486680-AG