Siemens ET 200pro Operating Instructions Manual page 179

Control interface PIQ (AB x to AB x+2):
The control interface is used to notify the IM154-1/-2 about the modules that are actually
present and which slots have been skipped. The IM154-1/-2 cannot evaluate the
configuration until it has received this information. Slot 0 (IM 154-1/-2) and slot 1 (virtual
power module PM-E) must be assigned the value 1.
Table 8- 1
Feedback interface PII (EB x to EB x+2):
The feedback interface (3 bytes) tells you which module is actually located in a certain slot.
Table 8- 2
If the feedback result of the feedback interface is identical with the specification of the control
interface, the configuration is correct.
Procedure
In order to start testing the options, set Bit 0=1 in the first byte (AB x).
Proceed as follows in order to ensure the consistency of the 3 bytes:
● Write the first byte (AB x) last (for direct access with T PAB)
or
● First write the complete information of the control interface in the first byte (AB x) with
Alternatively, you can use SFC15 in order to achieve consistent transfer.
Note
Whenever any change in the 3 bytes of the control interface takes place, this information is
stored and used, even if non-relevant bits were changed (bits outside the preset
configuration).
ET 200pro distributed I/O system
Operating Instructions, 03/2013, A5E00335544-08
Control interface
Slot Value of the bit
0 and 1 0
1
2 to 17 0
1
Feedback interface
Slot Value of the bit
0 and 1 0
1
2 to 17 0
1
Bit 0=0 and then set Bit 0=1 in this byte in the subsequent OB1 cycle.
Content of the bit track is not relevant
Bit track is valid
Slot is not present in the actual configuration
Slot is present in the actual configuration
Option handling is disabled
Option handling is enabled
Slot belongs to an option that not available or the module status
is not OK
Slot is available and is OK
8.1 PROFIBUS DP
Reaction
Reaction
Functions
179