Siemens SIMATIC NET CP 142-2, Manual, Page: 22 / 84

B8976111/02 AS-i Master Module CP 142-2
2-11
Configuring the CP 142-2 during an AS-i Power Fail (for example when the AS-i power
supply unit is turned off or when the CP 142-2 is not connected to the AS-Interface)
resets the configuration of the CP 142-2. This means the following:
•
No AS-i slaves are configured
•
All AS-i slave parameters are set
•
Automatic address programming is activated
Changing from the configuration mode to the protected mode is only possible when
there is no slave with address “0” connected to the AS-Interface. If a slave “0” is
connected, the “SF” LED lights up when you press the SET/DISPLAY button.
2.1.4.7 Types of Operation with the CP 142-2
With the CP 142-2 module, two types of operation are possible:
•
Standard operation
• •
Extended operation (with FC “ASI_3422”)
The difference between the two types of operation is as follows:
Standard operation
In this type of operation, the CP 142-2 behaves like a conventional analog input/output module. Four
input and four output bits are reserved in the controller for each slave on the AS-i cable.
In standard operation, no commands or special parameters can be transferred to the slaves on the
AS-i cable. This type of operation corresponds to the profile M0 of the AS-i master specification.
Extended operation (with FC “ASI_3422”)
With this type of operation, the entire range of functions in the AS-i system are available to the PLC
programmer. In particular, the AS-i master calls (for example to assign parameters to slaves) are
available. This type of operation corresponds to profile M1 of the AS-i master specification.
For extended operation, the “ASI_3422” FC is also required in addition to the CP 142-2. This FC is
shipped with this manual.
Please note that extended operation is currently only possible with the BM147.