Siemens 6GK7443-1EX30-0XE0 SIMATIC CP 443-1 Ethernet Module
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Product Information
The Siemens 6GK7443-1EX30-0XE0 is a SIMATIC NET CP 443-1 communications processor engineered for SIMATIC S7-400 control systems. Operating as a dedicated Industrial Ethernet module, it offloads high-volume TCP/IP, Open User Communication, and S7 network messaging from the main S7-400 CPU, preserving processing cycles for plant automation. Equipped with an integrated 2-port Real-Time Industrial Ethernet switch supporting 10/100 Mbit/s transmission speeds with autonegotiation and autocrossover, it enables efficient line and ring network topologies directly from the rack.
Connecting to Industrial Ethernet networks through two RJ45 ports, the module operates as a PROFINET IO Controller managing up to 128 IO devices, as well as a PROFINET IO Device or S7 communication node supporting up to 64 concurrent connections. Network configuration parameters are configured in STEP 7 (V5.4 SP4 or higher) or TIA Portal STEP 7 Professional (V11 or higher) and stored directly on the S7-400 CPU memory card. When commissioning a replacement module, parameter data transfers automatically from the CPU upon system reboot, enabling seamless module swapping without requiring a programming device on site. ABC Industrial Parts provides tested replacement units to support rapid restoration of plant operations.
Diagnostic feedback is provided on the front panel via LED indicators including INTF, EXTF, RUN, STOP, MAINT, and status LEDs for Port 1 and Port 2 link and activity. System monitoring is further supported through STEP 7 online diagnostics, NCM S7 diagnostics, the CPU system diagnostic buffer, SNMP v1, and an integrated HTTP web server. An illuminated EXTF LED signals network issues such as cable disconnects or duplicate IP addresses, while a solid INTF LED indicates internal memory or hardware failure. When internal hardware errors prevent communication recovery, replacing the module or sourcing a tested exchange unit through ABC Industrial Parts ensures minimal downtime.
Technical Specifications
| Manufacturer | Siemens |
| Part Number | 6GK7443-1EX30-0XE0 |
| Model / Type | CP 443-1 |
| Product Family | SIMATIC S7-400 |
| Component Type | Communication Module |
| Supply Voltage | 5 V DC |
| Typical Current Consumption | 1.4 A |
| Maximum Current Consumption | 1.8 A |
| Power Loss | 7.25 W |
| Ethernet Ports | 2 |
| Transmission Rate | 10/100 Mbit/s |
| Max S7 Connections | 64 |
| Max PROFINET IO Devices | 128 |
| Lifecycle Status | Discontinued |
Programming and Configuration
System configuration for the CP 443-1 is managed using STEP 7 V5.4 SP4 or higher, or STEP 7 Professional in TIA Portal V11 or higher. The module requires no direct parameter programming stored on its local hardware during initial setup; all network addresses, connection tables, and bus settings are stored centrally within the S7-400 CPU memory card.
When replacing an existing module, the automatic configuration transfer mechanism downloads the required parameters from the S7-400 CPU memory card directly to the replacement unit upon system boot. For firmware maintenance or recovery, reload procedures can be performed using STEP 7 or the NCM S7 diagnostic tool.
Communication and System Integration
The CP 443-1 features an integrated 2-port Real-Time Industrial Ethernet switch operating at 10/100 Mbit/s with autonegotiation and autocrossover functionality. This dual-port architecture enables flexible deterministic line and ring topologies without requiring external network switches, making it suitable for automotive, chemical processing, water treatment, and food production facilities.
Operating across multiple communication standards, the module functions as a PROFINET IO Controller controlling up to 128 PROFINET IO devices, or as a PROFINET IO Device. It handles up to 64 concurrent S7 connections and supports Open User Communication via TCP/IP, UDP, and ISO-on-TCP, alongside ISO Transport Protocol. Network management is integrated through SNMP v1, time synchronization via NTP, and HTTP web server access for browser-based monitoring.
Diagnostics and Status Indication
Detailed status monitoring is accessible through multiple channels, including STEP 7 / TIA Portal online diagnostics, the S7-400 CPU System Diagnostic Buffer, NCM S7 Diagnostics, SNMP v1, and an integrated web server accessible via standard web browser. These interfaces allow operators to inspect connection statuses, port speeds, and bus faults in real time.
Front panel status LEDs provide immediate physical diagnostic feedback. Internal hardware errors or external bus mismatches are visually isolated by the dedicated fault LEDs, permitting quick troubleshooting of power, configuration, or physical media issues.
Status LED Indicators
| LED | Color/Status | Meaning |
|---|---|---|
| INTF | Red - Solid | Internal Fault: Lit red during internal hardware error or memory defect. |
| EXTF | Red - Solid | External Fault: Lit red when external network failure occurs (bus error, duplicate IP, link loss). |
| RUN | Green - Solid / Flashing | Lit green in active normal operational state; flashing green during startup. |
| STOP | Yellow - Solid | Lit yellow when CP module is in STOP mode or waiting for configuration download. |
| MAINT | Yellow - Solid | Lit yellow when maintenance is requested on PROFINET IO line. |
| P1 LINK/ACT | Green/Yellow - Solid Green / Flashing | Lit green when link exists on Port 1; flashing during data transmission activity. |
| P2 LINK/ACT | Green/Yellow - Solid Green / Flashing | Lit green when link exists on Port 2; flashing during data transmission activity. |
Replacement and Spare Part Considerations
Although the 6GK7443-1EX30-0XE0 has reached discontinued lifecycle status, it remains widely used in existing SIMATIC S7-400 control racks. When installing a spare unit, matching the exact part number ensures full hardware compatibility with existing rack backplanes and fieldbus cabling.
Due to automatic parameter transfer from the main CPU memory card, replacing a failed module does not require loading project files from a field PG/PC. If upgrading or migrating hardware, the 6GK7443-1EX40-0XE0 serves as the direct successor and can be used in spare parts mode within the same control architecture.
Error Codes & Fault Codes
The following error codes may be displayed during operation or diagnostics:
| Code | Name | Description | Possible Cause | Recommended Action |
|---|---|---|---|---|
| INTF LED solid red | Internal Hardware Fault / Memory Fault | The CP 443-1 detected an internal hardware fault, ASIC error, or firmware memory corruption upon self-test. | Internal component failure, memory defect, corrupted firmware. | Power cycle module. If condition persists, return unit for repair or replace the module. |
| EXTF LED solid red | External Bus / Network Fault | The CP detected a network-level fault or external configuration mismatch. | Network cable unplugged or broken, PROFINET IO device failure, duplicate IP address detected, or fieldbus topology error. | Check network cabling, switch connections, connected PROFINET IO devices, and IP address assignment in STEP 7 configuration. |
| STOP LED solid yellow + INTF LED solid red | Firmware Initialization Error / Defective Firmware | Module failed to boot up firmware correctly. | Interrupted firmware update process or defective Flash memory. | Perform firmware download reload procedure using STEP 7 / NCM S7 diagnostic tool. If flash load fails, replace module. |
Frequently Asked Questions
How is the 6GK7443-1EX30-0XE0 module configured in an S7-400 system?
Configuration is performed using STEP 7 V5.4 SP4 or higher, or TIA Portal V11 or higher. The project parameters are saved directly to the S7-400 CPU memory card.
Does replacing a failed CP 443-1 require a programming device?
No. The replacement module automatically downloads its configuration parameters directly from the S7-400 CPU memory card upon system startup.
What do the INTF and EXTF LEDs indicate on the CP 443-1?
A solid red INTF LED indicates an internal hardware or memory fault, while a solid red EXTF LED indicates an external network fault such as a disconnected cable or duplicate IP address.
Which successor part can replace the 6GK7443-1EX30-0XE0?
The direct successor is part number 6GK7443-1EX40-0XE0, which can be operated in spare parts mode in existing SIMATIC S7-400 applications.
How many PROFINET IO devices and S7 connections can this module handle?
The CP 443-1 supports up to 128 PROFINET IO devices as a controller and up to 64 concurrent S7 communication connections.
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Data backup and recovery
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Specific firmware and hardware versions
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Disclaimer:
We are not an authorised distributor of Siemens.
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