Siemens SIMATIC S7-1200 - Page 471

Extended instructions
9.7 Diagnostics (PROFINET or PROFIBUS)
S7-1200 Programmable controller
System Manual, V4.2, 09/2016, A5E02486680-AK
471
Table 9- 161 Example 2 (continued): A module has been pulled from PROFIBUS slave device
"DPSlave_12". A value of 0x01FC_FF03 is returned for MODE 4 (Device exists).
Byte with value
Bit pattern with value
Notes
Byte 1 0x01
Bit 7 0000-0001 Bit 0
Bit 0 is true; data is available.
Byte 2 0xFC Bit 15 111
1
-1100 Bit 8
Byte 3 0xFF
Bit 23 1111-1111 Bit 16
Byte 4 0x03
Bit 31 0000-0011 Bit 24
Even though device 12 (Bit 12) has an error as shown in MODE 2 (Device defective) above, the d
e-
vice is still functioning on the network which causes MODE 4 (Device exists) to show the device as
an "existing device".
Table 9- 162 Example 3: PROFIBUS slave device "DPSlave_12" is disconnected (cable disconnected
or power loss) from the PROFIBUS network. "DPSlave_12" is still detected as a defec-
tive 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).
Byte with value
Bit pattern with value
Notes
Byte 1 0x01 Bit 7 0000-0001 Bit 0 Bit 0 is true; data is available.
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
Device 12 (Bit 12) is marked as not existing. With this exception, devices 10 through 25 still report as
existing.