Siemens CP 243-2 - Manual (Page 24)

Technical Description and Installation Instructions
1-16
SIMATIC NET CP 243-2 AS-i Master
C79000-G8976-C142/02
1.9 Configuring the AS-Interface with the SET Button
Interpreting the Display Status
The CP 243-2 distinguishes between two operating modes on the AS-Interface:
S
Configuration mode
S Protected mode
Pressing the SET button changes the operating mode.
Note
The SET button is only effective when the bit PLC_RUN = 0 is set in the control
byte of the CP 243-2. This is always the case when the S7-22x CPU is in the
STOP mode.
Configuration Mode
The configuration mode is used to install and start up an AS-i installation.
If the CP 243-2 is in the configuration mode (CM LED lit), it can exchange data
with every AS-i slave connected to the AS-i cable (except for an AS-i slave with
address ’0’). Newly added AS-i slaves are detected immediately by the master,
activated, and included in cyclic data exchange.
When installation and startup is completed, the CP 243-2 can be switched to the
protected mode using the SET button. At the same time, active AS-i slaves are
configured. The following data are then stored permanently on the CP 243-2:
S
The addresses of the AS-i slaves
S
The ID codes (ID code, extended ID1 code, extended ID2 code )
S
The I/O configuration
S
The current slave parameters
Protected Mode
In the protected mode, the CP 243-2 exchanges data only with the configured AS-i
slaves. In this sense, “configured” means that the slave addresses and the
configuration data stored on the CP 243-2 match the values of existing AS-i slaves.