Description

The Z7306 refers to the Siemens 6ES5 730-6CA11,a Communication Processor(CP)module known as the CP544,designed for the SIMATIC S5 programmable logic controller(PLC)family.This module enables PROFIBUS DP(Decentralized Peripherals)communication,allowing S5 PLCs to connect to distributed I/O systems,drives,HMIs,and higher-level control networks.

As a key component in industrial automation systems from the 1990s and early 2000s,the Z7306 CP544 bridges legacy S5 systems with modern fieldbus networks,supporting both master and slave configurations.It is widely used in manufacturing,water treatment,and power plants where older S5 systems remain in service.

Application Scenarios

At a municipal wastewater treatment plant in Germany,the main PLC—a SIMATIC S5-115U—was unable to communicate with newly installed remote I/O stations due to outdated communication hardware.The original CP542 module lacked PROFIBUS DP support.Engineers upgraded the system by installing a Siemens Z7306(6ES5 730-6CA11)CP544 module into the S5 chassis.After configuring the DIP switches and downloading the network parameters via STEP 5 software,the PLC successfully established a 12 Mbps PROFIBUS connection to 18 remote I/O cabinets.The Z7306’s reliable data exchange eliminated communication timeouts that previously caused pump sequencing errors.The plant achieved full integration of new field devices without replacing the entire PLC system—demonstrating the CP544’s role in extending the life of legacy automation platforms.

Parameter

Main Parameters Value/Description

Product Model Siemens Z7306(6ES5 730-6CA11)

Manufacturer Siemens AG

Product Category Communication Processor Module

Module Type CP544

Compatible System SIMATIC S5 PLCs(e.g.,S5-95U,S5-100U,S5-115U,S5-135U)

Communication Protocol PROFIBUS DP,MPI(Multi-Point Interface)

Data Rate 9.6 kbps to 12 Mbps(selectable)

Network Topology Bus or ring(with fiber optic repeaters)

Addressing DIP switch selectable(0–126)

Max Slaves Supported Up to 126 devices on PROFIBUS DP

Interface 9-pin SUB-D(RS-485),optional fiber optic link via OLM

Redundancy Support Yes–with redundant bus configurations

Installation Method Front-loadable into S5 rack(e.g.,UR1,UR2)

Power Supply 5VDC and 24VDC from backplane

Operating Temperature 0°C to+60°C(standard),-25°C to+60°C(extended)

Environmental Rating Humidity:5–95%RH(non-condensing)

Diagnostics LED indicators(RUN,ERR,SEND,RECV)

Configuration Software STEP 5,COM511/COM512 configuration tools

Technical Principles and Innovative Values

Innovation Point 1:The Z7306 CP544 enables high-speed PROFIBUS DP communication(up to 12 Mbps),allowing real-time data exchange between S5 PLCs and decentralized field devices—critical for synchronized control.

Innovation Point 2:It supports dual-role operation—configurable as a master(controlling I/O stations)or slave(connecting S5 to higher-level controllers like S7 PLCs).

Innovation Point 3:Designed for industrial durability,the Z7306 operates reliably in electrically noisy environments with robust EMI/RFI protection and galvanic isolation.

Innovation Point 4:As a field-proven communication gateway,it allows integration of legacy S5 systems into modern SCADA and MES networks,preserving automation investments.

Application Cases and Industry Value

A steel mill in Pennsylvania relied on SIMATIC S5 PLCs to control its rolling mill drives.Over time,spare CP modules became scarce,and communication failures increased.The plant sourced and installed Siemens Z7306(6ES5 730-6CA11)CP544 modules as replacements.After integration,the PROFIBUS network stability improved significantly,reducing drive trip incidents by 70%.The Z7306’s DIP switch configuration allowed quick setup without software tools during emergency replacements.Engineers also used the CP544 to connect the S5 system to a new WinCC SCADA system via Simatic NET,enabling real-time monitoring and historical data logging.This upgrade extended the operational life of the S5 system by over 12 years,showcasing the Z7306’s critical value in maintaining industrial continuity.

Installation,Maintenance,and Full-Cycle Support

The Z7306(6ES5 730-6CA11)installs into any free slot in a SIMATIC S5 rack(e.g.,UR1,UR2).It draws power from the backplane and connects to the PROFIBUS network via a 9-pin SUB-D connector.Configuration is done via DIP switches on the front panel(setting node address,baud rate,master/slave mode)and through STEP 5 or COM511/512 software.

LED indicators provide real-time status:

Green(RUN):Module operational

Red(ERR):Hardware or communication fault

Yellow(SEND/RECV):Data transmission activity

Routine maintenance includes:

Checking LED status during walkthroughs

Verifying cable connections and termination resistors

Backing up configuration settings

The Z7306 is hot-swappable in most configurations,allowing replacement without shutting down the PLC.

We offer complete lifecycle support for the Siemens Z7306 CP544,including:

Authentic refurbished and new-old-stock modules

Firmware and configuration validation

On-site testing and commissioning

Obsolescence management and migration planning

Whether you’re maintaining legacy S5 systems or integrating them into modern networks,our team ensures reliable,compatible communication modules.Contact us today for availability and technical support.

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Z7306 CP544 SIMATIC S5 Communication Processor – Supports Up to 126 Slave Devices

Description

Description

Application Scenarios

Parameter

Technical Principles and Innovative Values

Application Cases and Industry Value

Related Product Combination Solutions

Installation,Maintenance,and Full-Cycle Support