Technical Description and Installation Instructions

1.9Configuring the AS-Interface with the SET Button

Interpreting the Display Status

The CP 243-2 distinguishes between two operating modes on the AS-Interface:

SConfiguration mode

SProtected 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:

SThe addresses of the AS-i slaves

SThe ID codes (ID code, extended ID1 code, extended ID2 code)

SThe I/O configuration

SThe 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, ªconfiguredº means that the slave addresses and the configuration data stored on the CP 243-2 match the values of existing AS-i slaves.

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SIMATIC NET CP 243-2 AS-i Master

C79000-G8976-C142/02

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Siemens CP 243-2 Configuring the AS-Interface with the SET Button, Interpreting the Display Status, Configuration Mode