Siemens SIMATIC IM151-1 STANDARD Manual page 32

Functions
3.2 Option handling without reserve modules
Control interface PIQ (AB x to AB x+7):
You must inform the IM151-1 via the control interface about which modules actually exist
and which slots have been left out. The IM151-1 cannot evaluate the configuration until it has
received this information.
Table 3- 5
Feedback interface PII (EB x to EB x+7):
The feedback interface (8 bytes) tells you which module is actually located on which slot.
Table 3- 6
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 Bit0=1 in the first byte (AB x).
Proceed as follows in order to ensure the consistency of the 8 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
Bit0=0 and then set Bit0=1 in this byte in the subsequent OB1 cycle.
Alternatively you can use the SFC15 in order to achieve consistent transfer.
Note
Whenever any change in the 8 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).
32
Control interface
Slot Value of the bit
0 0
1
1 to 63 0
1
Feedback interface
Slot Value of the bit
0 0
1
1 to 63 0
1
Content of the bitspur is not relevant
Bitspur is valid
Slot does not exist in the actual configuration
Slot exists in the actual configuration
Option handling is inactive
Option handling is active
Slot belongs to an option that does not exist or the module sta-
tus is not OK
Slot exists and is OK
Interface module IM151-1 STANDARD (6ES7151-1AA06-0AB0)
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Manual, 07/2015, A5E01075950-AD