Description
Siemens 505-CP2572 | Simatic 505 Ethernet Communications Module
Dynamic Product Introduction
Network latency or dropped HMI packets in a SIMATIC 505 PLC architecture often signal an overloaded CPU attempting to process Ethernet traffic alongside critical ladder logic. The Siemens 505-CP2572 Ethernet Communications Coprocessor acts as a dedicated network offload engine within TI505/Siemens 505 rack assemblies.
By handling TCP/IP protocol stacks, socket messaging, and SCADA data polls directly on its onboard processor, the 505-CP2572 preserves CPU scan times while establishing fast, deterministic Ethernet connectivity. Replacing a failing coprocessor board restores reliable HMI monitoring, enables seamless enterprise integration, and prevents communication timeouts across legacy processing facilities.
505-CP2572
Key Technical Specifications
| Parameter | Specification Detail |
| Part / Catalog Number | 505-CP2572 |
| OEM Brands | Siemens / Texas Instruments / CTI (Control Technology Inc.) |
| System Compatibility | SIMATIC 505 / TI505 System Racks (545, 555, 575 CPUs) |
| Module Type | Ethernet Communications Coprocessor Module |
| Network Protocols | TCP/IP, UDP/IP, CAMP (Control Application Message Protocol) |
| Interface Ports | 10Base-T / 100Base-TX RJ-45 & AUI / 15-pin D-sub connectors |
| Backplane Power | Drawn directly from 505 rack backplane (+5 VDC) |
| Operating Temperature | 0°C to +60°C (32°F to 140°F) |
| Status LED Indicators | Module Status, Network Active, Link, Collision, Fault |
Global Sourcing & Live-Test SOP (Transparency Core)
Integrating legacy network modules into active control systems requires comprehensive bench validation to ensure protocol stack stability. Here is our multi-step testing procedure for every incoming 505-CP2572 module:
Inbound Verification
- High-magnification optical inspection of card-edge backplane connectors, surface-mount components, and network port pins for mechanical wear or thermal fatigue.
- Verification of board part numbers (
505-CP2572) and hardware revision levels against original Siemens/TI manufacturing databases.
Live Bench Simulation
- The 505- is populated into an active SIMATIC 505 chassis paired with a 545/555 CPU.
- Network cables are attached to establish TCP/IP communication with a SCADA node and programming workstation running Workshop / APT software.
Functional Load & Stress Testing
- Continuous data polling loops test multi-socket performance and TCP connection stability under max packet loads.
- A 24-hour thermal burn-in run at 50°C confirms zero packet loss, buffer overflows, or network processor reboots.
Final Prep
- Gold backplane edge contacts are solvent-cleaned and protected with anti-oxidation compound.
- Sealed in ESD shielding bags prior to dispatch.
The Field Engineer’s Pitfall Guide
❗ Dip-Switch & IP Address Configuration Overwrites:
Unlike modern plug-and-play Ethernet cards, the 505- relies on onboard DIP switches or memory-mapped IP configuration settings. Installing a replacement module without matching the DIP-switch configuration or downloading the correct IP allocation matrix from the CPU can isolate the rack from the plant network.
❗ Firmware Compatibility with Legacy CPUs:
The 505- requires compatible CPU firmware levels to utilize advanced TCP/IP socket features. Attempting to run this card with older CPU builds (e.g., early TI545 releases) can cause backplane buffer overflow errors or unacknowledged communication commands.
❗ Hot-Swapping Module Risks:
SIMATIC 505 racks do not support unconditioned live hot-swapping. Inserting or extracting the 505- card while the backplane is energized can arc connector pins and permanently damage the board’s bus driver ICs—honestly, I’ve seen plant technicians destroy a fresh ethernet card in seconds by inserting it into a live rack.
Intent-Driven FAQ
Does the Siemens 505- require separate power supplies?
No. The module draws its required operating power (+5 VDC) directly from the SIMATIC 505 rack backplane.
How do I configure the IP address on a replacement 505- card?
The IP address is either set via physical DIP switches on the card, assigned using a boot server (BOOTP), or written to allocated V-memory registers via the PLC software configuration program.
Can this card co-exist with other 505 communication cards in the same rack?
Yes. Multiple 505- cards or serial coprocessors can be installed in a single 505 rack, provided the rack power supply has sufficient current headroom.
What is the primary cause of network timeout errors on this card?
DIP-switch mismatch, loose AUI/RJ45 connections, or excessive broadcast storms on unmanaged plant networks are the most common causes of packet timeouts on legacy 505 Ethernet modules.
What warranty coverage is included with surplus or refurbished cards?
Every Siemens 505- module passing through our testing facility includes a full 1-year replacement warranty covering backplane bus handshake, network socket stability, and physical port hardware.
