CP 5412 Communication Processor Siemens A2 ISA Card 6GK1541-2BA00

6GK1541-2BA00 | Siemens SIMATIC NET CP 5412/A2 PROFIBUS ISA Card — PG/PC to PROFIBUS Connection / 16-Bit / Version 2

CP 5412/A2 — The PROFIBUS Gateway for PG and PC

The 6GK1541-2BA00 is the CP 5412/A2 — a SIMATIC NET communications processor board that installs in a PC's ISA bus slot and provides a PROFIBUS master or slave interface. This card was the standard hardware solution for connecting Siemens PG (Programming Devices) and general-purpose PCs running STEP 5, STEP 7, or other SIMATIC engineering and diagnostic software to PROFIBUS DP/FMS fieldbus networks.

The CP 5412/A2 ("A2" = hardware version 2) provides the necessary PROFIBUS physical layer, timing, and protocol handling that a standard PC's parallel or serial port cannot supply — PROFIBUS requires specific real-time communication that a dedicated processor card handles independently of the PC's main CPU.

Key Specifications

PROFIBUS — The Industrial Fieldbus Standard

PROFIBUS (Process Field Bus) is an industrial fieldbus standard widely deployed in Siemens SIMATIC PLC systems, SINUMERIK CNC machines, SIMODRIVE drive systems, and process instrumentation:

PROFIBUS DP (Decentralised Peripherals): The most common variant — designed for fast data exchange between a master controller (PLC or CNC) and distributed I/O slaves (remote I/O stations, drives, sensors). DP operates at speeds up to 12 Mbit/s.

PROFIBUS FMS (Field Message Specification): An older variant for data exchange between intelligent field devices — less commonly used than DP.

The 6GK1541-2BA00 CP 5412/A2 provides the PC with the capability to act as a PROFIBUS master or slave node — enabling STEP 5 or STEP 7 programming software to online-connect to the PLC, read diagnostics, monitor I/O states, and download programmes directly over the PROFIBUS network.

Application Scenarios

PG/PC to PROFIBUS network connection: A Siemens PG running STEP 7 engineering software needs to connect to a PROFIBUS DP network to programme or diagnose a SIMATIC S7 PLC system. The 6GK1541-2BA00 CP 5412/A2 provides the PROFIBUS interface from the PG's ISA slot.

Diagnostic access for legacy PROFIBUS systems: A maintenance engineer needs to diagnose an older PROFIBUS DP network using a PG or industrial PC with an ISA slot. The 6GK1541-2BA00 card provides the physical network connection and protocol handling for the diagnostic software.

FAQ

Q1: What software is required to use 6GK1541-2BA00 for PROFIBUS communication?

The CP 5412/A2 requires a Windows driver and SIMATIC NET software — typically supplied as part of the SIMATIC NET PC Software package or the STEP 7 engineering software installation. The card's PROFIBUS address and communication parameters are configured through the SIMATIC NET interface configuration tool. The specific software version must be compatible with the host operating system and the CP 5412/A2 hardware revision.

Q2: What operating system does 6GK1541-2BA00 support?

The CP 5412/A2 was designed for the Microsoft Windows operating systems current during its production period — primarily Windows NT, Windows 98, and Windows 2000. Support for later operating systems depends on the SIMATIC NET software version available for the CP 5412 hardware. The A2 hardware revision corresponds to the software environment available in the late 1990s and early 2000s.

Q3: What is the difference between the CP 5412/A2 and later PROFIBUS CP cards (such as CP 5611)?

The CP 5412/A2 (6GK1541-2BA00) uses the older ISA bus — it fits in ISA expansion slots found in older PG devices and industrial PCs from the 1990s. Later cards like the CP 5611 and CP 5613 use the PCI bus, which replaced ISA in modern PC architectures. PCI cards provide higher bus bandwidth and are compatible with current-generation PC hardware. The CP 5412/A2 is specifically for ISA-equipped equipment — it cannot be installed in a PCI slot.

Q4: What PROFIBUS cable and connector are needed with 6GK1541-2BA00?

PROFIBUS DP/FMS uses a dedicated shielded twisted-pair cable with a characteristic impedance of 150 Ω — the PROFIBUS bus cable type A or type B. Connection to the CP 5412/A2 is through a standard 9-pin Sub-D female connector at the card's bracket, with the PROFIBUS cable's A and B signal wires connected to the defined pin positions. For installations at the physical ends of the PROFIBUS segment, a 150 Ω termination resistor must be enabled at the first and last node on the cable.

Q5: Is 6GK1541-2BA00 a PROFIBUS DP master or slave?

The CP 5412/A2 can operate as a PROFIBUS DP Class 1 master (the primary controller managing cyclical I/O exchange with DP slaves), a DP Class 2 master (a programming and diagnostic master — the role used by STEP 7 or STEP 5 for online access), or as a DP slave (where the PC responds to I/O requests from a PLC master). The operating role is configured through the SIMATIC NET software — the hardware card supports all three modes.