AC500-eCo | Classic processor module
ABB PM556-TP-ETH AC500-eCo Processor Module
A 24 V DC compact CPU with 512 kB program memory, eight digital inputs, six transistor outputs, onboard Ethernet and pluggable I/O terminals.
BrandABB
ModelPM556-TP-ETH
Identification1SAP121200R0071
01
Key Information
PM556-TP-ETH is an AC500-eCo processor module intended for compact standalone control. Article 1SAP121200R0071 provides 512 kB of program memory, one onboard Ethernet interface and integrated transistor I/O in a pluggable-terminal construction.
The onboard I/O set comprises eight digital inputs and six transistor outputs for 24 V DC applications. ABB introduced the model for small machines whose programs require more memory than the standard early AC500-eCo CPU range.
02
Functions
- Runs compact AC500-eCo control applications with 512 kB of program memory.
- Reads eight onboard digital input channels without a separate local input module.
- Switches six 24 V DC transistor output channels for compatible field loads.
- Provides an onboard Ethernet interface for engineering and supported communications.
- Uses pluggable I/O terminal blocks to simplify panel wiring and processor exchange.
- Supports the AC500-eCo option and accessory context documented for this CPU generation.
03
Specifications
| Manufacturer | ABB |
|---|---|
| Product Family | AC500-eCo |
| Model | PM556-TP-ETH |
| Article Number | 1SAP121200R0071 |
| Product Type | Programmable logic controller CPU |
| Program Memory | 512 kB |
| Supply Voltage | 24 V DC |
| Digital Inputs | 8 |
| Digital Outputs | 6 transistor channels |
| Ethernet | Onboard interface |
| Terminal Style | Pluggable I/O terminal blocks |
| Original Firmware Context | Introduced with firmware 2.3.x |
| Engineering Context | Automation Builder support |
| Lifecycle | Classic |
04
Installation
- Identify the complete 1SAP article number and preserve the existing terminal-block type before removing the CPU.
- Provide a stable 24 V DC controller supply and verify the transistor-output load wiring.
- Record the Ethernet address and communication parameters before transferring the application.
- Match every input and output terminal to the saved wiring map rather than relying only on wire color.
- Confirm the engineering package and firmware combination used by the installed machine.
- After installation, test application startup, Ethernet communication and all fourteen onboard I/O points.
05
Lifecycle
- PM556-TP-ETH is in ABB lifecycle phase Classic and should be treated as an installed-base service product.
- For modernization, review a current AC500-eCo V3 CPU against program size, onboard I/O, Ethernet functions and terminal conversion requirements.
- Do not assume program or terminal compatibility from the PM5xx name alone; hardware generation and full article number matter.
- Back up the source project and retain the original firmware and library information before replacement.
- A new-platform migration should include functional testing of every onboard channel and network exchange.
