CP 443-5 Basic

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  • Connection of the S7-400 to PROFIBUS
  • Communication services:
    • PG/OP communication
    • S7 communication
    • Open communication (SEND/RECEIVE)
  • Time synchronization
  • Easy programming and configuration over PROFIBUS
  • Cross-network programming device communication through S7 routing
  • Can be easily integrated into the SIMATIC S7-400 system
  • Modules can be replaced without the need for a PG
  • SIMATIC H system operation for redundant S7 communication


  • Simple integration of the SIMATIC S7 into a multi-vendor automation group by means of PROFIBUS FMS
  • Application in fault-tolerant systems due to redundant S7 communication
  • Extensive reduction of workload for the user of PROFIBUS FMS specification due to simple configuration and independent data conversion of data on the CP
  • Plant-wide clock time thanks to clock synchronization
  • Integration of the SIMATIC S7-400 into existing systems by means of open communication
  • Universal application of the CP due to the parallel use of different communication services on one CP

Область применения

The CP 443-5 Basic communications processor is the module required for SIMATIC S7-400 for the PROFIBUS bus system.

It offloads communication tasks from the CPU.

Communications options of the S7-400 through communications modules:

  • FMS communication with PROFIBUS stations through PROFIBUS
  • Communication with programming devices, human machine interface devices
  • Communication with other SIMATIC S7 systems
  • Communication with SIMATIC S5 PLCs

The number of CPs that can be operated depends on the performance range of the CPU and the communication services used.


The CP 443-5 communications processor features all the advantages of the SIMATIC S7-400 design:

  • Compact construction,
    9?pin Sub?D socket for connection to PROFIBUS
  • Single-width module
  • Easy installation,
    the CP 443-5 is mounted on the S7-400 rack and connected to the other modules of the S7-400 by means of the backplane bus. No slot rules apply in this case.
  • User-friendly wiring,
    the Sub-D socket is easily accessible and simple to operate.
  • The CP 443-5 Basic can be operated without a fan. A backup battery or memory module is not required
  • When using SEND/RECEIVE, the number of operable modules depends on the S7-400 CPU used.


The CP 443-5 Basic provides access to different communication services of the PROFIBUS bus system:

  • PG/OP communication
  • S7 communication (S7 controllers)
  • Open communication (SEND/RECEIVE)
  • PROFIBUS FMS (to IEC 61158/61784)
  • Time synchronization

PG/OP communication

PG/OP communication allows all S7 stations connected to the network to be remotely programmed.

  • S7 routing
    With the aid of routing it is possible to use programming device communication across networks.

S7 communication

S7 communication is used for the coupling

  • between SIMATIC S7 automation systems
  • to programming devices (PG/OP communication)
  • To PCs,
    e.g. with CP 5512, CP 5611 A2, CP 5621 and SOFTNET-PB S7 or CP 5613 A2, CP 5613 FO, CP 5614 A2, CP 5623, CP 5624 and HARDNET-PB S7
  • to HMI devices (OPs).
  • For redundant S7 communication, the CP 443-5 Basic can also be used in SIMATIC H systems.

Open communication (SEND/RECEIVE)

Based on Layer 2 (FDL) of PROFIBUS, the CP 443-5 Basic offers a simple, optimized interface for data communication. This interface offers integrated, high-performance communication between SIMATIC S5, SIMATIC S7 and the PC. It provides the services SDA (PLC/PLC connections) and SDN (Broadcast/Multicast).

The communication partners are the automation systems:

    with CP 342-5, CP 343-5, CP 443-5 Extended and Basic
    with S5-95U with PROFIBUS interface, S5-115U/H, S5-135U, S5-155U/H with CP 5431 FMS/DP
  • SIMATIC 505
    with CP 5434-FMS
  • PCs
    with CP 5512, CP 5611 A2, CP 5621, CP 5613 A2, CP 5613 FO, CP 5614 A2, CP 5623, CP 5624
  • Non-Siemens systems that are equipped with an FDL interface.

To use SEND/RECEIVE, function calls are required (PLC-SEND/PLC-RECEIVE), which must be linked into the STEP 7 user program.


PROFIBUS FMS, according to IEC 61158/61784, permits the transmission of messages via various FMS services:

    for read or write access to variables of the communication partner from the user program (by means of a variable index or variable name), for the transfer of its own variable values to the communication partner.
    Partial access to variables is supported. The communication takes place over acyclic connections (master/master, master/slave), over acyclic connections with a slave initiative and cyclic connections (master/slave).

    (Report) permits unconfirmed transmission of variables by an FMS server. This job type is used particularly for transmission on broadcast FMS connections.
    for requesting the identification features of the communication partner
    for requesting the partner status

Time synchronization

The CP 443-5 Basic is capable of forwarding the time of day of the S7-400 CPU to PROFIBUS. Conversely, the CP 443-5 Basic of the S7-400 CPU can make an existing time of day available on the PROFIBUS.


Extensive diagnostic options are available via STEP 7, including:

  • Status of the CP
  • General diagnostics and statistics functions
  • Connection diagnostics
  • Bus statistics
  • Message buffer


STEP 7 V5.1 SP2 or higher is required for configuring the full functional scope of the CP 443-5 Basic. In Version V5 or higher of STEP 7, the configuration data of the CP can also optionally be stored on the CPU and is retained even if there is a power failure. A module can therefore be replaced without having to reload the configuration data from a programming device. The CPU transfers the configuration data to the CP during start-up.

Configuration and programming of all SIMATIC S7 controllers connected to the network is possible over the network.

The function blocks for using the open communication (SEND/RECEIVE) can be found in the SIMATIC NET library following installation of STEP 7.

Технические данные

Article number


Product type designation

CP 443-5 Basic

Transmission rate

Transfer rate

  • ? at the 1st interface acc. to PROFIBUS

9.6 kbit/s ... 12 Mbit/s


Number of interfaces acc. to Industrial Ethernet


Number of electrical connections

  • ? at the 1st interface acc. to PROFIBUS


Type of electrical connection

  • ? at the 1st interface acc. to PROFIBUS

9-pin Sub-D socket (RS485)

Supply voltage, current consumption, power loss

Type of voltage of the supply voltage


Supply voltage 1 from backplane bus

5 V

Supply voltage

5 V

Relative symmetrical tolerance at DC

  • ? at 5 V

5 %

Consumed current

  • ? from backplane bus at DC at 5 V typical

1 A

  • ? from external supply voltage at DC at 24 V typical

1.2 A

Power loss [W]

5 W

Permitted ambient conditions

Ambient temperature

  • ? during operation

0 ... 60 °C

  • ? during storage

-40 ... +70 °C

  • ? during transport

-40 ... +70 °C

Relative humidity at 25 °C without condensation during operation maximum

95 %

Protection class IP


Design, dimensions and weight

Module format

Compact module S7-400 single width


25 mm


290 mm


210 mm

Net weight

0.65 kg

Product properties, functions, components general

Number of units

  • ? per CPU maximum


  • ? Note

depending on CPU type

Performance data open communication

Number of possible connections for open communication by means of SEND/RECEIVE blocks maximum


Amount of data

  • ? as user data per connection for open communication by means of SEND/RECEIVE blocks maximum

240 byte

Performance data FMS functions

Number of possible connections for FMS connection maximum


Amount of data of the variables

  • ? for READ job maximum

237 byte

  • ? for WRITE job maximum

233 byte

Number of variables

  • ? Configurable from server to FMS partner


  • ? Loadable from server to FMS partner

2 640

Performance data S7 communication

Number of possible connections for S7 communication

  • ? maximum


Performance data multi-protocol mode

Number of possible connections of which 2 reserved for PG/OP communication with multi-protocol mode maximum


Configuration software

  • ? required

STEP 7 V5.2 SP1 or higher and NCM S7 for PROFIBUS