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:

• SIMATIC S7
  with CP 342-5, CP 343-5, CP 443-5 Extended and Basic
• SIMATIC S5
  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

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

• READ, WRITE;
  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).
• INFORMATION REPORT;
  (Report) permits unconfirmed transmission of variables by an FMS server. This job type is used particularly for transmission on broadcast FMS connections.
• IDENTIFY;
  for requesting the identification features of the communication partner
• STATUS;
  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.

Diagnostics

Extensive diagnostic options are available via STEP 7, including:

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

Configuration

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.