Specifications
AS-Interface
Masters
Masters for SIMATIC S7
CP 243-2
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Overview
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
(Analog Profiles 7.3 and 7.4)
• 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
• Fault indications (e. g. AS-Interface voltage fault, configura-
tion 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 terminals for direct connection of the AS-Interface
cable
• LEDs in the front panel for indicating the operating state and
functional readiness of all connected 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 configura-
tion.
Function
The CP 243-2 supports all specified functions of the extended
AS-Interface Specification V2.1.
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.
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Benefits
• More flexibility and versatility in the use of SIMATIC S7-200 as
the result of the distinct increase in the number of digital and
analog inputs/outputs available
• Shorter start-up times through simple configuration at the
press of a button
• Reduction of standstill and servicing times in the event of a
fault thanks to the LED indicators
• Status of the CP
- Indication of all the slaves connected and their readiness for
operation
- Monitoring of the AS-Interface mains voltage
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Application
The CP 243-2 is the AS-Interface master connection for the
22x CPUs of the SIMATIC S7-200. Through connection to
AS-Interface the number of inputs and outputs available for
S7-200 is greatly increased (max. 248 DI / 186 DO on the
AS-Interface per CP).
Analog values (per CP a maximum of 31 standard analog slaves
with up to 4 channels each) also become available on the
AS-Interface for the S7-200 thanks to the integrated analog
value processing. On the S7-200, up to two CP 243-2 communi-
cation processors can be operated simultaneously.
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Selection and ordering data
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More information
The manuals are also available on the Internet at
http://support.automation.siemens.com/WW/view/en/10805937/133300
Version Screw terminals
Order No.
6GK7 243-2AX01-0XA0
CP 243-2 communication processors
6GK7 243-2AX01-0XA0
For connection of the SIMATIC S7-200 to AS-Interface;
corresponds to AS-Interface Specification V2.1;
dimensions (W x H x D / mm): 71 x 80 x 62
(dimensions without fixing lugs)
Kap_06_en.book Seite 35 Freitag, 2. September 2011 1:42 13
© Siemens AG 2011