How to Deploy Modern CP 443-1 (EX30) Communications Processors in Legacy SIMATIC PCS 7 V6.0 Systems

Deploying a modern SIMATIC NET CP 443-1 communications processor (6GK7443-1EX30-0XE0) as a replacement or expansion card in a legacy SIMATIC PCS 7 V6.0 system is fully supported via Siemens backward compatibility rules. Because the EX30 hardware did not exist when PCS 7 V6.0 was released in 2004, the module does not appear in the legacy STEP 7 Hardware Catalog. To configure it, engineers must insert the latest available predecessor module profile present in the catalog—specifically CP 443-1 EX11 (6GK7443-1EX11-0XE0) or EX20. The EX30 hardware automatically emulates the predecessor firmware profile, supporting plant bus communication, S7 connections, and time synchronization without driver errors.

Hardware Evolution and Legacy Compatibility: CP 443-1 EX30 vs EX11

Maintaining brownfield PCS 7 V6.0 and V6.1 systems presents serious spare parts challenges:
* The Obsolete Hardware Problem: The original communications processor supplied with PCS 7 V6.0 was the CP 443-1 EX11 (6GK7443-1EX11-0XE0), discontinued by Siemens over a decade ago.
* The Modern Replacement: The current industrial standard is the CP 443-1 EX30 (6GK7443-1EX30-0XE0), featuring integrated 2-port Gigabit/Fast Ethernet switches and advanced security.
* The Compatibility Question: Can an EX30 module manufactured in 2016 run in a PCS 7 V6.0 environment released in 2004?
* The Official Siemens Answer: Yes. Siemens enforces strict functional backward compatibility across S7-400 communication processors.

Predecessor Emulation Rules in STEP 7 HW Config

When opening HW Config in PCS 7 V6.0, searching for 6GK7443-1EX30-0XE0 yields zero results because the catalog predates the module:

Do NOT Attempt to Force Modern HSPs into V6.0:
* STEP 7 V5.3 (used in PCS 7 V6.0) cannot parse modern XML hardware support packages (HSPs) designed for STEP 7 V5.5.
Apply Predecessor Hardware Configuration:
* In the HW Config catalog, browse to: SIMATIC 400 > CP 400 > Industrial Ethernet > CP 443-1.
* Select the highest revision available in the V6.0 catalog:
- 6GK7443-1EX11-0XE0 (Firmware V2.0 or V2.1)
- (Or 6GK7443-1EX20-0XE0 if updated via V6 SP updates).
- Drag the EX11 module into the S7-400 rack slot occupied by the physical EX30 module.
Automatic Microprocessor Emulation:
* When System Data Blocks (SDBs) compiled for EX11 are downloaded to the physical EX30 hardware, the EX30 operating system detects the legacy parameter frame and automatically operates in EX11 Compatibility Mode.

Configuring ISO Transport, TCP/IP, and MAC Addresses in PCS 7 V6.0

When configuring the virtual EX11 profile for the physical EX30 hardware:

MAC Address Assignment:
Set the MAC address in HW Config to match the physical MAC address printed on the front label of the new EX30 module.
IP Protocol Selection:
If operating on an ISO Transport Plant Bus (standard in PCS 7 V6.0), check Set MAC address / use ISO protocol.
If operating on TCP/IP, assign the static IP address and subnet mask.
Integrated Switch Port Usage:
The physical EX30 has two RJ45 ports (integrated 2-port switch). You can use either port to connect to the plant bus industrial switch (SCALANCE X). The second port can be used to daisy-chain or connect an engineering laptop.

Firmware Features and S7-REDCONNECT Support in Mixed Environments

Operating in predecessor mode carries specific functional boundaries:

Supported Functions in Compatibility Mode:
ISO Transport and ISO-on-TCP (RFC 1006) protocol processing.
S7 Communication (BSEND/BRCV, USEND/URCV).
Fault-Tolerant S7 Connections via SIMATIC NET S7-REDCONNECT.
Clock Synchronization (SIMATIC Time Sync via ISO broadcast).
Disabled Modern Features:
Advanced IP routing across gigabit subnets.
Integrated web server and modern SNMP v3 diagnostic security.
These advanced features are ignored while operating in EX11 emulation mode.

Comparison of CP 443-1 Module Generations

The table below compares the technical specifications across CP 443-1 generations.

Generation / MLFBHardware Release YearPhysical PortsMaximum Baud RateCompatibility Mode in PCS 7 V6.0EX11 (6GK7443-1EX11-0XE0)20021x AUI / 1x RJ45100 Mbps (Fast Ethernet)Native Catalog EntryEX20 (6GK7443-1EX20-0XE0)20072x RJ45 Switch100 Mbps (Fast Ethernet)Supported via Service PackEX30 (6GK7443-1EX30-0XE0)2011+2x RJ45 Switch100 Mbps / Gigabit readyEmulates EX11 / EX20

Verification

To confirm that the modern CP 443-1 EX30 operates properly in PCS 7 V6.0:
1. Insert the physical EX30 into the S7-400 rack and connect the plant bus Ethernet cable.
2. In HW Config, verify that the slot is configured as 6GK7443-1EX11-0XE0 with the matching MAC/IP address.
3. Download the hardware configuration: PLC > Download to Module.
4. Inspect the front LEDs of the EX30: confirm that RUN is steady green and STOP is off.
5. In WinCC Explorer on the OS Server, open WinCC Channel Diagnosis: verify that the Named Connection to the S7-400 station reports status Operational with zero telegram error counters.

Limitations and Operational Precautions

In redundant S7-400H systems, both sub-racks must maintain identical or functionally equivalent CP configurations; do not mix baud rates or duplex settings across redundant links.
If replacing a failed CP in an active production controller, verify whether the S7-400 CPU firmware supports dynamic module replacement in RUN (H-CiR).
Never force modern STEP 7 V5.5 firmware upgrade files onto legacy S7-400 CPUs operating in PCS 7 V6.0.
Always validate final hardware ordering numbers (MLFBs) and spare part availability against the applicable Siemens catalog and authorized distributor quotation.

Engineer FAQ

Will PCS 7 V6.0 reject the EX30 module during boot?

No. The S7 backplane identifies the module as a member of the CP 443-1 family and accepts the configuration as long as the hardware catalog entry corresponds to an approved predecessor like EX11.

Can I use both RJ45 ports on the EX30 module in PCS 7 V6.0?

Yes. The two physical RJ45 ports function as an unmanaged 2-port switch at the hardware level, allowing daisy-chaining without requiring software configuration in V6.0.