CP 243-2

The CP 243-2 is the AS-Interface master for the SIMATIC S7-200 and has the following features:

• Connection of up to 62 AS-Interface slaves
• Integrated analog value transmission
• Supports all AS-Interface master functions according to the extended AS-Interface specification V2.1
• Indication of the operating state and readiness for operation of connected slaves by means of LEDs in the front panel
• Indication of faults (e.g. AS-Interface voltage fault, configuration fault) by means of LEDs in the front panel
• Compact enclosure in the design of the SIMATIC S7-200

Design

The CP 243-2 is connected like an expansion module to the S7-200.

It has:

• Two screw connections for direct connection of the AS-Interface cable
• LEDs in the front panel for indicating the operating state and functional readiness of all connected and activated slaves
• Two pushbuttons for indicating the status information of the slaves, for switching over the operating state and for adopting the existing ACTUAL configuration as the DESIRED configuration

Function

The CP 243-2 supports all the specified functions of extended Version 2.1. of AS-Interface specification.

In the process image of the S7-200 the CP 243-2 occupies one digital input byte (status byte), one digital output byte (control byte), and 8 analog input and 8 analog output words. The CP 243-2 thus occupies two (logic) slots. The operating mode of the CP 243-2 can be set with the status byte and the control byte using the user program. Depending on the operating mode, the CP 243-2 saves either the digital or analog I/O data of the AS-Interface slaves or diagnostic values in the analog address area of the S7-200, or it enables master calls (e.g. re-addressing of the slaves).

Configuration

All connected AS-Interface slaves are configured at the press of a button. No further configuration of the CP is required.